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UISearchBar控�g�Q��{载）

Wed, 04 Mar 2015 11:23:00 GMT

摘要: UISearchBar控�g��是要�ؓ你完成搜索功能的一个专用控件。它集成了很多你意想不到的功能和特点�Q�首先，�q�是来普及一下UISearchBar控�gAPI相关的属性和�Ҏ��吧！UISearchBar属性相关_searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];// 初始化，不解�?nbsp;&nb... 阅读全文

王�v�?/a> 2015-03-04 19:23 发表评论

Mon, 18 Aug 2014 01:45:00 GMT

NSString中如果包括中文字�W�，在�{换�ؓNSURL时得到的��gؓnil

解决办法�Q?/span>

NSString *urlString = [NSString stringWithFormat:@"http://api.openweathermap.org/data/2.5/weather?q=%@&units=imperial",cityName];
urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:urlString];
NSLog(@"%@", url);

王�v�?/a> 2014-08-18 09:45 发表评论

Fri, 01 Aug 2014 05:31:00 GMT

�W�一�?
创徏2个NSNotificationCenter监听

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillResignActive:)
name:UIApplicationWillResignActiveNotification object:nil]; //监听是否触发home键挂��L���?
    
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:)
name:UIApplicationDidBecomeActiveNotification object:nil]; //监听是否重新�q�入�E�序�E�序.

�W�二�?
实现2个NSNotificationCenter所触发的事件方�?/span>

- (void)applicationWillResignActive:(NSNotification *)notification
{
    printf("按理说是触发home按下\n");
}
- (void)applicationDidBecomeActive:(NSNotification *)notification
{
    printf("按理说是重新�q�来后响应\n");
}

�? 在home键触发后,AppDelegate响应的方法�ؓ:

- (void)applicationDidEnterBackground:(UIApplication *)application { /* Use this method to release shared resources, save user data, invalidate timers,

and store enough application state information to restore your application to its current state in case it is terminated later. If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. */ }

本文转自�Q?/span>http://blog.csdn.net/sqc3375177/article/details/9466687

其他相关信息�Q?/div>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions  
{  
    // Override point for customization after application launch.  
    NSLog(@"\n ===> �E�序开�?nbsp;!");   
      
    return YES;  
}  
                              
- (void)applicationWillResignActive:(UIApplication *)application  
{  
      
    NSLog(@"\n ===> �E�序暂行 !");   
}  
  
- (void)applicationDidEnterBackground:(UIApplication *)application  
{  
      
     NSLog(@"\n ===> �E�序�q�入后台 !");   
}  
  
- (void)applicationWillEnterForeground:(UIApplication *)application  
{  
      
     NSLog(@"\n ===> �E�序�q�入前台 !");   
}  
  
- (void)applicationDidBecomeActive:(UIApplication *)application  
{  
    NSLog(@"\n ===> �E�序重新�Ȁ�z?nbsp;!");   
      
}  
  
- (void)applicationWillTerminate:(UIApplication *)application  
{  
    NSLog(@"\n ===> �E�序意外暂行 !");   
  
    UIDevice *device = [UIDevice currentDevice];  
      
}  

首次�q�行�Q?/p>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

- (void)applicationDidBecomeActive:(UIApplication *)application

首次关闭�Q�home�Q�：

- (void)applicationWillResignActive:(UIApplication *)application

- (void)applicationDidEnterBackground:(UIApplication *)application

再次�q�行�Q?/span>

- (void)applicationWillEnterForeground:(UIApplication *)application

- (void)applicationDidBecomeActive:(UIApplication *)application

再次关闭�Q?/span>

- (void)applicationWillResignActive:(UIApplication *)application

- (void)applicationDidEnterBackground:(UIApplication *)application

本文转自�Q�http://friendlysong.blog.163.com/blog/static/3225243920128144251666/

王�v�?/a> 2014-08-01 13:31 发表评论

Tue, 29 Jul 2014 05:35:00 GMT

摘要: UIGestureRecognizer 是一个具体手势的基类�Q�提供了较�ؓ��单的手势实现方式 The concrete subclasses of UIGestureRecognizer are the following:UITapGestureRecognizerUIPinchGestureRecognizerUIRotationGestureRecog... 阅读全文

王�v�?/a> 2014-07-29 13:35 发表评论

Tue, 15 Jul 2014 05:50:00 GMT

�?/span>“Header Search Paths” 中添�?/span>“/usr/include/libxml2″
�?/span>“Other Linker Flags”��d��“-lxml2″
�q�行后出现错误找不到

解决办法�Q?/span>�?/span>“Header Search Paths” 中添�?/span> ${SDKROOT}/usr/include/libxml2

王�v�?/a> 2014-07-15 13:50 发表评论

iOS UIButton�W�记

Tue, 15 Jul 2014 05:37:00 GMT

创徏两种�Ҏ��Q?/span>
�Q?�Q�常规的initWithFrame的方�?nbsp;
UIButton *btn1 = [[UIButton alloc]initWithFrame:CGRectMake(100, 50, 100, 75)];

[btn1 setTitle:@"close" forState:UIControlStateNormal];
btn1.backgroundColor = [UIColor greenColor];//button的背景颜�?/span>
[btn1 setBackgroundImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];//button的背景图�?/span>

�Q?�Q�UIButton 的一个类�Ҏ��Q�也可以说是静态方法）buttonWithType
UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn2.frame = CGRectMake(200, 20, 50, 60);
btn2.backgroundColor = [UIColor blackColor];
[btn2 setTitle:@"clicke" forState:UIControlStateNormal];
[self.window addSubview:btn1];
[self.window addSubview:btn2];

能够定义的button�c�d��?�U?/span>
typedef enum
{
    UIButtonTypeCustom = 0,   // 自定义，无风�?nbsp;
    UIButtonTypeRoundedRect,      // 白色圆角矩�Ş�Q�类似偏好设�|�表格单元或者地址��卡�?nbsp;
    UIButtonTypeDetailDisclosure, // 蓝色的披露按钮，可放在�Q何文字旁
    UIButtonTypeInfoLight, // 微�g(widget)使用的小圆圈信息按钮�Q�可以放在�Q何文字旁
    UIButtonTypeInfoDark, // 白色背景下��用的��p��圆圈信息按钮
    UIButtonTypeContactAdd,       // 蓝色加号(+)按钮�Q�可以放在�Q何文字旁
} UIButtonType;

[btn1 setTitle:@"BTN1" forState:UIControlStateNormal]; //讄��按钮的标�?br />
[btn1 setTitle:@"高亮状�? forState:UIControlStateHighlighted]; //高亮状态按钮title�?br />
[btn2 setImage:[UIImage imageNamed:@"pic"] forState:UIControlStateNormal];   //你也可以为按钮的某一状态设�|��ؓ�?nbsp;

[btn1 setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; //讄��标题颜色

[btn1 setTitleShadowColor:[UIColor grayColor] forState:UIControlStateNormal ];   //阴媄

[btn1 setBackgroundImage:[UIImage imageNamed:@"PIC"] forState:UIControlStateHighlighted];  //背景囑փ�

btn1.titleLabel.font = [UIFont fontWithName�Q�@“test” size:18];    //讄��按钮字体大小

[btn1 setTag:101] ; //讄��tag�?/span>

btn1.layer.cornerRadius = 4.5; //讄��圆角——四个圆角半径
btn1.layer.borderWidth = 0.5; // 按钮�Ҏ��宽度

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); // 讄��颜色�I�间为rgb�Q�用于生成ColorRef

CGColorRef borderColorRef = CGColorCreate(colorSpace,(CGFloat[]){ 0, 0, 0, 1 }); // 新徏一个红色的ColorRef�Q�用于设�|�边框（四个数字分别�?r, g, b, alpha�Q?/span>

btn1.layer.borderColor = borderColorRef; // 讄��Ҏ��颜色

更多属性参考链接：http://www.cocoachina.com/wiki/index.php?title=UIButton&variant=zh-cn

参数 forState . �q�个参数军_��了标题、图像或其他属性将在何�U�状态下昄��。你可以�~�程令按钮在那个状态变�?nbsp;
enum {
    UIControlStateNormal       = 0, // 常�?nbsp;
    UIControlStateHighlighted  = 1 << 0, // 高亮
    UIControlStateDisabled     = 1 << 1,   // ��用
    UIControlStateSelected     = 1 << 2,   // 选中
    UIControlStateApplication  = 0x00FF0000, // 当应用程序标志��用时
    UIControlStateReserved     = 0xFF000000  // 为内部框枉��留的
};
typedef NSUInteger UIControlState;

你只要掌握前四种状态就好了�?/span>
当按钮高亮或者禁用，UIButton �c�d��以调整自��q��外观�Q�下面几个属性可以让你按照需要对按钮的外观进行微调：
adjustsImageWhenHighlighted
默认情况下，在按钮被��用�Ӟ��囑փ�会被�ȝ��颜色�׃��些。要��用此功能，请将�q�个属性设�|��ؓNO�Q?/span>
btn1.adjustsImageWhenHighlighted = NO;

adjustsImageWhenDisabled
默认情况下，按钮在被��用�Ӟ��囑փ�会被�ȝ��颜色淡一些。要��用此功能，请将�q�个属性设�|��ؓNO�Q?/span>
btn1.adjustsImageWhenDisabled = NO;

showsTouchWhenHighlighted
�q�个属性设�|��ؓYES�Q�可令按钮在按下时发光。这可以用于信息按钮或者有些重要的按钮�Q?/span>
btn1.showsTouchWhenHighlighted = YES;

昄��控�g
[self.view addSubview:btn1];
[self.view addSubview:btn2];

重写�l�制行�ؓ

你可以通过子类化按钮来定制属于你自��q��按钮�c�R��在子类化的时候你可以重蝲下面�q�些�Ҏ��Q�这些方法返回CGRect�l�构�Q�指明了按钮每一�l�成部分的边界�?/span>
注意�Q�不要直接调用这些方法， �q�些�Ҏ��是你写给�pȝ��调用的�?/span>

backgroundRectForBounds   //指定背景边界
contentRectForBounds   // 指定内容边界
titleRectForContentRect   // 指定文字标题边界
imageRectForContentRect   //指定按钮囑փ�边界

例：
- (CGRect)imageRectForContentRect:(CGRect)bounds
{
     return CGRectMake(0.0, 0.0, 44, 44);
}

[btn1 addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];//��d��点击按钮事�g

-(void)btnPressed:(id)sender
{
      UIButton* btn = (UIButton*)sender;
      //开始写你自��q��动作
}

forControlEvents参数�c�d��
typedef NS_OPTIONS(NSUInteger, UIControlEvents)
{
UIControlEventTouchDown = 1 <<  0,      // 单点触摸按下事�g�Q�用��L��触屏�q�，或者又有新手指落下的时候�?br /> UIControlEventTouchDownRepeat = 1 <<  1,      // 多点触摸按下事�g�Q�点触计数大�?�Q�用��h��下第二、三、或�W�四�Ҏ��指的时候�?/span>
    UIControlEventTouchDragInside = 1 <<  2,      // 当一�ơ触摸在控�g�H�口内拖动时�?/span>
    UIControlEventTouchDragOutside = 1 <<  3,      // 当一�ơ触摸在控�g�H�口之外拖动时�?/span>
    UIControlEventTouchDragEnter = 1 <<  4,      // 当一�ơ触�总�控�g�H�口之外拖动到内部时
    UIControlEventTouchDragExit   = 1 <<  5,      // 当一�ơ触�总�控�g�H�口内部拖动到外部时�?/span>
    UIControlEventTouchUpInside = 1 <<  6,      // 所有在控�g之内触摸抬�v事�g
    UIControlEventTouchUpOutside = 1 <<  7,      // 所有在控�g之外触摸抬�v事�g(点触必须开始与控�g内部才会发送通知)�?/span>
    UIControlEventTouchCancel = 1 <<  8,      //所有触摸取消事�Ӟ��即一�ơ触摸因为放上了太多手指而被取消�Q�或者被上锁或者电话呼叫打断�?/span>

    UIControlEventValueChanged   = 1 << 12,     // 当控件的值发生改变时�Q�发送通知。用于滑块、分�D�|��件、以及其他取值的控�g。你可以配置滑块控�g何时发送通知�Q�在滑块被放下时发送，或者在被拖动时发送�?/span>

    UIControlEventEditingDidBegin   = 1 << 16,     // 当文本控件中开始编辑时发送通知
    UIControlEventEditingChanged   = 1 << 17,     // 当文本控件中的文本被改变时发送通知�?/span>
    UIControlEventEditingDidEnd = 1 << 18,     // 当文本控件中�~�辑�l�束时发送通知�?/span>
    UIControlEventEditingDidEndOnExit = 1 << 19,     // 当文本控件内通过按下回�R键（或等仯��为）�l�束�~�辑�Ӟ��发送通知�?/span>

    UIControlEventAllTouchEvents   = 0x00000FFF,  // 通知所有触�怺�件�?/span>
    UIControlEventAllEditingEvents   = 0x000F0000,  // 通知所有关于文本编辑的事�g�?/span>
    UIControlEventApplicationReserved = 0x0F000000,  // range available for application use
    UIControlEventSystemReserved = 0xF0000000,  // range reserved for internal framework use
    UIControlEventAllEvents = 0xFFFFFFFF   // 通知所有事�?/span>
};

王�v�?/a> 2014-07-15 13:37 发表评论

iOS UITextField�W�记

Tue, 15 Jul 2014 03:02:00 GMT

//手动定义一个UITextField 及其基本的属性：
UITextField *text = [[UITextField alloc]initWithFrame:CGRectMake(20, 20, 130, 30)];

//讄��Ҏ��样式�Q�只有设�|�了才会昄��Ҏ��样式　
text.borderStyle = UITextBorderStyleRoundedRect;
typedef enum
{
    UITextBorderStyleNone,
    UITextBorderStyleLine,
    UITextBorderStyleBezel,
    UITextBorderStyleRoundedRect
  } UITextBorderStyle;
　
text.backgroundColor = [UIColor whiteColor];   //讄��输入框的背景颜色�Q�此时设�|��ؓ白色如果使用了自定义的背景图片边框会被忽略掉　
text.background = [UIImage imageNamed:@"dd.png"]; //讄��背景
text.disabledBackground = [UIImage imageNamed:@"cc.png"]; //讄��背景
text.placeholder = @"password"; //当输入框没有内容�Ӟ��水印提示提示内容为password
text.font = [UIFont fontWithName:@"Arial" size:20.0f]; //讄��输入框内容的字体样式和大��?/span>
text.textColor = [UIColor redColor]; //讄��字体颜色
text.clearButtonMode = UITextFieldViewModeAlways; //输入框中是否有个叉号�Q�在什么时候显�C�，用于一�ơ性删除输入框中的内容

typedef enum
{
    UITextFieldViewModeNever,　   //重不出现
    UITextFieldViewModeWhileEditing, //�~�辑时出�?/span>
    UITextFieldViewModeUnlessEditing, // 除了�~�辑外都出现
    UITextFieldViewModeAlways 　   //一直出�?nbsp;
} UITextFieldViewMode;

text.text = @"一开始就在输入框的文�?/span>";   //输入框中一开始就有的文字
text.secureTextEntry = YES;   //每输入一个字�W�就变成�?nbsp;用语密码输入
text.autocorrectionType = UITextAutocorrectionTypeNo;//是否�U�错

typedef enum
{
    UITextAutocorrectionTypeDefault, // 默认
    UITextAutocorrectionTypeNo, 　 //不自动纠�?br />    UITextAutocorrectionTypeYes,　 //自动�U�错
} UITextAutocorrectionType;

text.clearsOnBeginEditing = YES; //再次�~�辑��清�I?/span>
text.textAlignment = UITextAlignmentLeft; //内容寚w��方式
text.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//内容的垂直对齐方�?nbsp; UITextField�l�承自UIControl,此类中有一个属性contentVerticalAlignment
textFied.adjustsFontSizeToFitWidth = YES;   //讄��为YES时文本会自动�~�小以适应文本�H�口大小.默认是保持原来大��?而让长文本滚动　
text.minimumFontSize = 20; //讄��自动�~�小昄��的最��字体大��?/span>
text.keyboardType = UIKeyboardTypeNumberPad; //讄��键盘的样�?/span>

typedef enum
{
    UIKeyboardTypeDefault,     　默认键盘�Q�支持所有字�W?br />    UIKeyboardTypeASCIICapable,　支持ASCII的默认键�?br />    UIKeyboardTypeNumbersAndPunctuation,　标准电话键盘�Q�支持＋�Q�＃字符
    UIKeyboardTypeURL, URL键盘�Q�支�?com按钮只支持URL字符
UIKeyboardTypeNumberPad,            　数字键盘
UIKeyboardTypePhonePad,　　电话键盘
    UIKeyboardTypeNamePhonePad, 　电话键盘�Q�也支持输入人名
UIKeyboardTypeEmailAddress, 　用于输入电子邮�g地址的键�?nbsp;
UIKeyboardTypeDecimalPad,   　数字键盘有数字和��数�?br />    UIKeyboardTypeTwitter,      　优化的键盘，方便输入@�?字符
    UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable,
} UIKeyboardType;

text.autocapitalizationType = UITextAutocapitalizationTypeNone;//首字母是否大�?/span>

typedef enum
{
    UITextAutocapitalizationTypeNone, 不自动大�?br />    UITextAutocapitalizationTypeWords,　单词首字母大�?br />    UITextAutocapitalizationTypeSentences,　句子的首字母大写
    UITextAutocapitalizationTypeAllCharacters, 所有字母都大写
} UITextAutocapitalizationType;

text.returnKeyType =UIReturnKeyDone;//return键变成什么键
typedef enum
{
    UIReturnKeyDefault, 默认灰色按钮�Q�标有Return
    UIReturnKeyGo,    　标有Go的蓝色按�?br />    UIReturnKeyGoogle, 标有Google的蓝色按钮，用语搜烦
    UIReturnKeyJoin, 标有Join的蓝色按�?br />    UIReturnKeyNext, 标有Next的蓝色按�?br />    UIReturnKeyRoute, 标有Route的蓝色按�?br />    UIReturnKeySearch, 标有Search的蓝色按�?br />    UIReturnKeySend, 标有Send的蓝色按�?br />    UIReturnKeyYahoo, 标有Yahoo的蓝色按�?br />    UIReturnKeyYahoo, 标有Yahoo的蓝色按�?br />    UIReturnKeyEmergencyCall, 紧急呼叫按�?nbsp;
} UIReturnKeyType;

textView.keyboardAppearance=UIKeyboardAppearanceDefault�Q?/span>//键盘外观
typedef enum
{
UIKeyboardAppearanceDefault�Q?/span> 默认外观�Q�浅灰色
UIKeyboardAppearanceAlert�Q?/span>　　��q�� 矛_��?/span>
} UIReturnKeyType;

text.delegate = self;//讄��代理用于实现协议
[self.window addSubview:text];//把textfield加到视图�?br />
//最右侧加图片是以下代码　左侧�c�M��
UIImageView *image=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]];
text.rightView=image;
text.rightViewMode = UITextFieldViewModeAlways;

typedef enum
{
    UITextFieldViewModeNever,
    UITextFieldViewModeWhileEditing,
    UITextFieldViewModeUnlessEditing,
    UITextFieldViewModeAlways
} UITextFieldViewMode;

//按return键键盘往下收  becomeFirstResponder

�c�要采用UITextFieldDelegate协议
text.delegate = self;　声明text的代理是我，我会��d��现把键盘往下收的方�?nbsp;�q�个�Ҏ��在UITextFieldDelegate里所以我们要采用UITextFieldDelegate�q�个协议

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [text resignFirstResponder];    //主要是[receiver resignFirstResponder]在哪调用��p��把receiver对应的键盘往下收
    return YES;
}
重写�l�制行�ؓ
除了UITextField对象的风格选项�Q�你�q�可以定制化UITextField对象�Q��ؓ他添加许多不同的重写�Ҏ��Q�来改变文本字段的显�C��为。这些方法都会返回一个CGRect�l�构�Q�制定了文本字段每个部�g的边界范围。以下方法都可以重写�?br />
– textRectForBounds:　　  　 //重写来重�|�文字区�?/span>
– drawTextInRect:　　      　   //改变�l�文字属�?重写时调用super可以按默认图形属性绘�?若自己完全重写绘制函敎ͼ��׃��用调用super�?
– placeholderRectForBounds:   //重写来重�|�占位符区域
– drawPlaceholderInRect:　　 //重写改变�l�制占位�W�属�?重写时调用super可以按默认图形属性绘�?若自己完全重写绘制函敎ͼ��׃��用调用super�?
– borderRectForBounds:　　 //重写来重�|�边�~�区�?/span>
– editingRectForBounds:　　 //重写来重�|�编辑区�?/span>
– clearButtonRectForBounds:　//重写来重�|�clearButton位置,改变size可能��D��button的图片失�?/span>
– leftViewRectForBounds:
– rightViewRectForBounds:

委托�Ҏ��
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{　　　
      //�q�回一个BOOL��|��指定是否循序文本字段开始编辑　　
      return YES;　
}　

- (void)textFieldDidBeginEditing:(UITextField *)textField
{　
       //开始编辑时触发�Q�文本字�D�将成�ؓfirst responder　
}　

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{　
      //�q�回BOOL��|��指定是否允许文本字段�l�束�~�辑�Q�当�~�辑�l�束�Q�文本字�D�会让出first responder　
　   //要想在用��L��束编辑时��L��文本字段消失�Q�可以返回NO　
　   //�q�对一些文本字�D�必��d��l�保持活跃状态的�E�序很有用，比如��x��消息　
　
    return NO;　
}　

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{　
      //当用户��用自动更正功能，把输入的文字修改为推荐的文字�Ӟ��׃��调用�q�个�Ҏ��。　
      //�q�对于想要加入撤销选项的应用程序特别有用　
      //可以跟踪字段内所做的最后一�ơ修改，也可以对所有编辑做日志记录,用作审计用途。　　
      //要防止文字被改变可以�q�回NO　
      //�q�个�Ҏ��的参��C��有一个NSRange对象�Q�指明了被改变文字的位置�Q�徏议修改的文本也在其中　

　   return YES;　
}　

- (BOOL)textFieldShouldClear:(UITextField *)textField
{　
      //�q�回一个BOOL值指明是否允许根据用戯��求清除内宏V��
      //可以讄��在特定条件下才允许清除内宏V��

　   return YES;　
}　

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{　
      //�q�回一个BOOL��|��指明是否允许在按下回车键时结束编辑　
       //如果允许要调用resignFirstResponder �Ҏ��Q�这回导致结束编辑，而键盘会被收起[textField resignFirstResponder];
      //查一下resign�q�个单词的意思就明白�q�个�Ҏ��了　
　   return YES;　
}　

通知
UITextField�z��自UIControl�Q�所以UIControl�c�M��的通知�pȝ��在文本字�D�中也可以��用。除了UIControl�cȝ��标准事�g�Q�你�q�可以��用下列UITextField�cȝ��有的事�g

UITextFieldTextDidBeginEditingNotification
UITextFieldTextDidChangeNotification
UITextFieldTextDidEndEditingNotification
当文本字�D�退出编辑模式时触发。通知的object属性存储了最�l�文本�?br />
因�ؓ文本字段要��用键盘输入文字，所以下面这些事件发生时�Q�也会发送动作通知
UIKeyboardWillShowNotification 　//键盘昄��之前发�?/span>
UIKeyboardDidShowNotification  　//键盘昄��之后发�?/span>
UIKeyboardWillHideNotification 　 //键盘隐藏之前发�?/span>
UIKeyboardDidHideNotification  　 //键盘隐藏之后发�?/span>

1、Text �Q�设�|�文本框的默认文本�?/div>

2、Placeholder �Q?nbsp;可以在文本框中显�C�灰色的字，用于提示用户应该在这个文本框输入什么内宏V��当�q�个文本框中输入了数据时�Q�用于提�C�的灰色的字��会自动消失�?/div>

3、Background �Q?/div>

4、Disabled �Q?nbsp;若选中此项�Q�用户将不能更改文本框内宏V�?/div>

5、接下来是三个按钮，用来讄��寚w��方式�?/div>

6、Border Style �Q?nbsp;选择边界风格�?/div>

7、Clear Button �Q?nbsp;�q�是一个下拉菜单，你可以选择清除按钮什么时候出玎ͼ�所谓清除按钮就是出一个现在文本框双��的小 X �Q�你可以有以下选择�Q?/div>

7.1 Never appears �Q?nbsp;从不出现

7.2 Appears while editing �Q?nbsp;�~�辑时出�?/div>

7.3 Appears unless editing �Q?nbsp;

7.4 Is always visible �Q?nbsp;��L��可见

8、Clear when editing begins �Q?nbsp;若选中此项�Q�则当开始编辑这个文本框�Ӟ��文本框中之前的内容会被清除掉。比如，你现在这个文本框 A 中输入了 "What" �Q�之后去�~�辑文本�?nbsp;B�Q�若再回来编辑文本框 A �Q�则其中�?nbsp;"What" 会被立即清除�?/div>

9、Text Color �Q?nbsp;讄��文本框中文本的颜艌Ӏ?/div>

10、Font �Q?nbsp;讄��文本的字体与字号�?/div>

11、Min Font Size �Q?nbsp;讄��文本框可以显�C�的最��字体（不过我感觉没什么用�Q?/div>

12、Adjust To Fit �Q?nbsp;指定当文本框��寸减小�Ӟ��文本框中的文本是否也要羃��。选择它，可以使得全部文本都可见，即��文本很长。但是这个选项要跟 Min Font Size 配合使用�Q�文本再�~�小�Q�也不会��于讑֮��?nbsp;Min Font Size �?/div>

接下来的部分用于讄��键盘如何昄��?/div>

13、Captitalization �Q?nbsp;讄��大写。下拉菜单中有四个选项�Q?/div>

13.1 None �Q?nbsp;不设�|�大�?/div>

13.2 Words �Q?nbsp;每个单词首字母大写，�q�里的单词指的是以空格分开的字�W�串

13.3 Sentances �Q?nbsp;每个句子的第一个字母大写，�q�里的句子是以句号加�I�格分开的字�W�串

13.4 All Characters �Q?nbsp;所以字母大�?/div>

14、Correction �Q?nbsp;��查拼写，默认�?nbsp;YES �?/div>

15、Keyboard �Q?nbsp;选择键盘�c�d��Q�比如全数字、字母和数字�{��?/div>

16、Appearance�Q?/div>

17、Return Key �Q?nbsp;选择�q�回键，可以选择 Search �?nbsp;Return �?nbsp;Done �{��?/div>

18、Auto-enable Return Key �Q?nbsp;如选择此项�Q�则只有臛_��在文本框输入一个字�W�后键盘的返回键才有效�?/div>

19、Secure �Q?nbsp;当你的文本框用作密码输入框时�Q�可以选择�q�个选项�Q�此�Ӟ��字符昄��为星受��?/div>

1.Alignment Horizontal 水��^寚w��方式

2.Alignment Vertical 垂直寚w��方式

3.用于�q�回一个BOOL倹{��输入框是�?nbsp;Selected(选中) Enabled(可用) Highlighted(高亮)

限制只能输入特定的字�W?/div>

(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSCharacterSet *cs;
    cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS]invertedSet];

    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""]; //按cs分离出数�l?数组按@""分离出字�W�串

    BOOL canChange = [string isEqualToString:filtered];

    return canChange;
}

上面那个NUMBERS是一个宏�Q�可以在文�g�剙��定义�Q?/div>

#define NUMBERS @”0123456789n” �Q�这个代表可以输入数字和换行�Q�请注意�q�个n�Q�如果不写这个，Done按键��不会触发，如果用在SearchBar中，��会不触发Search事�g�Q�因��Z��自己限制不让输入n�Q�好惨，我在��目中才发现的。）

所以，如果你要限制输入英文和数字的话，��可以把�q�个定义为：

#define kAlphaNum @”ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789″�?/div>

当然�Q�你�q�可以在以上�Ҏ��return之前�Q�做一提示的，比如提示用户只能输入数字之类的。如果你觉得有需要的话�?/div>

限制只能输入一定长度的字符

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
{　
      //string��是此时输入的那个字�W?nbsp;textField��是此时正在输入的那个输入框 �q�回YES��是可以改变输入框的�?nbsp;NO相反
      if ([string isEqualToString:@"n"])　//按会车可以改�?/span>
      {
           return YES;
      }
      NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string]; //得到输入框的内容

      if (self.myTextField == textField)　//判断是否时我们想要限定的那个输入�?/span>
      {
          if ([toBeString length] > 20)
          {
               //如果输入框内容大�?0则弹��?/span>
               textField.text = [toBeString substringToIndex:20];
               UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:nil message:@"��过最大字��C��能输入了" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil] autorelease];
               [alert show];
               return NO;
          }
      }

    return YES;
}

本文转自�Q?/span>http://www.3lian.com/edu/2012/11-08/43227.html

王�v�?/a> 2014-07-15 11:02 发表评论

iOS日期�W�记

Tue, 15 Jul 2014 02:43:00 GMT

1、根据年、月、日获取星期�?/strong>

- (int)getWeekdayFromDate:(int)nYead andMonth:(int)nMonth andDay:(int)nDay
{
    NSDateComponents *_comps = [[NSDateComponents alloc] init];
    [_comps setDay:nDay];
    [_comps setMonth:nMonth];
    [_comps setYear:nYead];
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDate *_date = [gregorian dateFromComponents:_comps];
    NSDateComponents *weekdayComponents =
    [gregorian components:NSWeekdayCalendarUnit fromDate:_date];
    int _weekday = [weekdayComponents weekday];

    return _weekday;
}

�?/span>

- (NSUInteger)getWeekdayFromDate:(NSDate*)date
{
    NSCalendar* calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDateComponents* components = [[[NSDateComponents alloc] init] autorelease];
    NSInteger unitFlags = NSYearCalendarUnit |
                          NSMonthCalendarUnit |
                          NSDayCalendarUnit |
                          NSWeekdayCalendarUnit |
                          NSHourCalendarUnit |
                          NSMinuteCalendarUnit |
                          NSSecondCalendarUnit;

    components = [calendar components:unitFlags fromDate:date];
    NSUInteger weekday = [components weekday];
    return weekday;
}

2、根据月和日获取星��

-(NSString *)getAstroWithMonth:(int)m day:(int)d
{
    NSString *astroString = @"��羯水瓶双鱼白羊金牛双子巨蟹狮子处女天秤天蝎��手��羯";
    NSString *astroFormat = @"102123444543";
    NSString *result;
    if (m < 1 || m > 12 || d < 1 || d > 31)
    {
        return @"错误日期格式!";
    }
    if(m == 2 && d > 29)
    {
        return @"错误日期格式!!";
    }
    else if(m == 4 || m == 6 || m == 9 || m == 11)
    {
        if (d > 30)
        {
            return @"错误日期格式!!!";
        }
    }

    result = [NSString stringWithFormat:@"%@",[astroString substringWithRange:NSMakeRange(m*2 - (d < [[astroFormat substringWithRange:NSMakeRange((m - 1), 1)] intValue] - (-19))*2, 2)]];

    return result;
}

3、计��两个日期之间相差几天几��时几分�?/strong>

NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
   [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
   NSDate *  senddate=[NSDate date];
   //�l�束旉��
   NSDate *endDate = [dateFormatter dateFromString:@"2014-6-24 00:00:00"];
   //当前旉��
   NSDate *senderDate = [dateFormatter dateFromString:[dateFormatter stringFromDate:senddate]];
   //得到相差�U�数
   NSTimeInterval time=[endDate timeIntervalSinceDate:senderDate];

   int days = ((int)time)/(3600*24);
   int hours = ((int)time)%(3600*24)/3600;
   int minute = ((int)time)%(3600*24)600/60;

   if (days <= 0&&hours; <= 0&&minute; <= 0)
       dateContent=@"0�?��时0分钟";
   else
       dateContent=[[NSString alloc] initWithFormat:@"%i�?i��时%i分钟",days,hours,minute];

4、获取当前时�?/strong>

NSDate *now = [NSDate date];
NSLog(@”now date is: %@”, now);

NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];

int year = [dateComponent year];
int month = [dateComponent month];
int day = [dateComponent day];
int hour = [dateComponent hour];
int minute = [dateComponent minute];
int second = [dateComponent second];

NSLog(@”year is: %d”, year);
NSLog(@”month is: %d”, month);
NSLog(@”day is: %d”, day);
NSLog(@”hour is: %d”, hour);
NSLog(@”minute is: %d”, minute);
NSLog(@”second is: %d”, second);

注：�Ҏ��互联�|�资料整�?/span>

王�v�?/a> 2014-07-15 10:43 发表评论

Mon, 23 Jun 2014 05:54:00 GMT

在iOS应用开发中�Q�有三类视图对象会打开虚拟键盘�Q�进行输入操作，但如何关闭虚拟键盘，却没有提供自动化的方法。这个需要我们自己去实现。这三类视图对象分别是UITextField,UITextView和UISearchBar�?br /> �q�里介绍一下UITextField中关闭虚拟键盘的几种�Ҏ��?/p>

(原文链接: http://mikixiyou.iteye.com/blog/1753330 )

�W�一�U�方法，使用它的委托UITextFieldDelegate中的�Ҏ��textFieldShouldReturn:来关闭虚拟键盘�?/strong>
在UITextField视图对象如birdNameInput所在的�c�M��实现�q�个�Ҏ��?br />
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if ((textField == self.birdNameInput) || (textField == self.locationInput)) {
        [textField resignFirstResponder];
    }
    return YES;
}
�q�样�Q�在输入框birdNameInput中打开虚拟键盘后，��d��键盘的return键就会自动关闭掉虚拟键盘�?/span>

�W�二�U�方法，��birdNameInput的属性中Return Key修改为done�Q�再定义一个方法和Done键的Did End On Exit�q�接。通过��d��done键触发这个事件来关闭虚拟键盘�?/strong>
定义的方法如下：
- (IBAction) textFieldDoneEditing:(id)sender
{
        [sender resignFirstResponder];
}

�q�两个方法都是轻击虚拟键盘上一个键来关闭它。这属于�_��操作�Q�而手指不像鼠标，做这�U�操作不�Ҏ��。因此就UI层面而言�Q�这两个�Ҏ��都不是最好的�Ҏ��?br /> 在iphone或ipad屏幕上，虚拟键盘占用的面�U�大��是有限的。通过��d��虚拟键盘之外的区域而关闭虚拟键盘�?/p>

�W�三�U�方法，通过��d��键盘之外的空白区域关闭虚拟键盘�?/strong>
在birdNameInput所属的视图控制器类的viewDidLoad�Ҏ��中定义一个UITapGestureRecognizer的对象，然后��它赋��gؓ它的视图�?br />
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]   initWithTarget:self action:@selector(dismissKeyboard)];
[self.view addGestureRecognizer:tap];
[tap release];

再定义一下选择器调用的�Ҏ��dismissKeyboard�?br />
-(void)dismissKeyboard {
       [birdNameInput resignFirstResponder];
}

如果屏幕上有多个textField的话�Q�一个一个地列出来就有些�ȝ��。那么将�Ҏ��修改一下，如下�Q?br />
-(void)dismissKeyboard {
    NSArray *subviews = [self.view subviews];
    for (id objInput in subviews) {
        if ([objInput isKindOfClass:[UITextField class]]) {
            UITextField *theTextField = objInput;
            if ([objInput isFirstResponder]) {
                [theTextField resignFirstResponder];
            }
        }
    }
}

如果�q�个屏幕上的视图对象很复杂的话，另当别论�?br /> �q�个�Ҏ��是编码新��Z��个手势对象。也可以直接使用interface builder囑�Ş化开发工��P��在storyboard中拉入一个手势对象到视图控制器类中，再将此手势对象徏立一个IBACTION�Q�名�U�可以是dismissKeyboard�?br />
�W�四�U�方法，通过��d��键盘之外的空白区域关闭虚拟键盘�?/strong>
��屏�q�上的view也就是textField的父视图拖一个touch down事�g出来�Q�和一个能关闭虚拟键盘的方法连接。如果视图没有touch down事�g�Q�可��view的父�c�M��UIView修改为UIButton�?br /> 首先定义�q�实��C��个方法backgroundTap�Q��?/p>
- (IBAction) backgroundTap:(id)sender
{
        NSArray *subviews = [self.view subviews];
    for (id objInput in subviews) {
        if ([objInput isKindOfClass:[UITextField class]]) {
            UITextField *theTextField = objInput;
            if ([objInput isFirstResponder]) {
                [theTextField resignFirstResponder];
            }
        }
    }
}

然后选择背景视图的Touch Down事�g�Q�连�?backgroundTap�Q�即可。这样只要轻��M��下虚拟键盘之外的区域�Q�就能关闭虚拟键盘。这些方法都是��用resignFirstResponder�Ҏ��来关闭虚拟键盘，�q�有其他的方法�?/p>

�W�五�U�方法，使用endEditing�Q�方�?/strong>
在所在的视图控制器类中，覆盖�q�个�Ҏ��?br />
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      [[self view] endEditing:YES];
}

This method looks at the current view and its subview hierarchy for the text field that is currently the first responder. If it finds one, it asks that text field to resign as first responder. If the force parameter is set to YES, the text field is never even asked; it is forced to resign.
但是�Q�如果这个屏�q�很复杂�Q�虚拟键盘之外的区域中有很多按钮。轻击这些区域时可能会轻��d��q�些按钮�Q�这栯��拟键盘就不能关闭�?br /> 要是扑ֈ�一个没有按钮的�I�白区域都不�Ҏ��且还有隐藏的视图对象�Ӟ��通过��d��虚拟键盘之外的区域关闭虚拟键盘的�Ҏ��实现��h��难了�?/p>

�W�六�U�方法，覆盖hitTest:withEvent:�Ҏ��关闭虚拟键盘

在stackoverflow.com上，有�h�q�样�ȝ��。说使用hitTest:withEvent:�Ҏ��是最好的�Q�也是最�Ҏ��的解��x��法�?/p>

I think the easiest (and best) way to do this is to subclass your global view and use hitTest:withEvent method to listen to any touch.
Touches on keyboard aren't registered, so hitTest:withEvent is only called when you touch/scroll/swipe/pinch... somewhere else, then call [self endEditing:YES].
This is better than using touchesBegan because touchesBegan are not called if you click on a button on top of the view.
It is better than UITapGestureRecognizer which can't recognize a scrolling gesture for example. It is also better than using a dim screen because in a complexe and dynamic user interface, you can't put dim screen every where. Moreover, it doesn't block other actions, you don't need to tap twice to select a button outside (like in the case of a UIPopover).
Also, it's better than calling [textField resignFirstResponder], because you may have many text fields on screen, so this works for all of them.

因此�Q�我再徏立一个��承UIView的视囄��。在�q�个视图�c�M��Q�覆盖hitTest:withEvent:�Ҏ��Q�增加[self endEditing:YES]�Ҏ��?/p>
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
UIView *result = [super hitTest:point withEvent:event];
[self endEditing:YES]
return result;
}
我将视图控制器的主视图所属类修改��个新��囄��。这样在屏幕上轻��M�Q何位�|�都会关闭虚拟键盘�?br /> �q�个�Ҏ��是最��单，也是最好的关闭虚拟键盘的方法�?br /> 使用好hitTest:withEvent:�q�个�Ҏ��Q�还可以实现很多很复杂的功能�?br /> The implementation of hitTest:withEvent: in UIResponder does the following:

    It calls pointInside:withEvent: of self

    If the return is NO, hitTest:withEvent: returns nil. the end of the story.

    If the return is YES, it sends hitTest:withEvent: messages to its subviews. it starts from the top-level subview, and continues to other views until a subview returns a non-nil object, or all subviews receive the message.

    If a subview returns a non-nil object in the first time, the first hitTest:withEvent: returns that object. the end of the story.

    If no subview returns a non-nil object, the first hitTest:withEvent: returns self

This process repeats recursively, so normally the leaf view of the view hierarchy is returned eventually.
However, you might override hitTest:withEvent to do something differently. In many cases, overriding pointInside:withEvent: is simpler and still provides enough options to tweak event handling in your application.

王�v�?/a> 2014-06-23 13:54 发表评论

iOS界面传递之委托

Wed, 18 Jun 2014 06:50:00 GMT
     摘要:     IOS开发��用委托delegate在不同窗口之间传递数据是本文要介�l�的内容�Q�主要是来讲解如何��用委托delegate在不同窗口之间传递数据，具体内容来看详细内容。在IOS开发里两个UIView�H�口之间传递参数方法有很多�Q�比�?1、��用SharedApplication,定义一个变量来传�? 2、��用文�Ӟ��或者NSUserdefaul...  阅读全文

王�v�?/a> 2014-06-18 14:50 发表评论

iOS中UIImageview�W�记

Wed, 28 May 2014 06:33:00 GMT
1、设�|�背景图�?

1 UIImageView *imgView =[[UIImageView alloc] initWithFrame:CGRectMake(128, 80,64,64)];

2     imgView.image = [UIImage imageNamed:@"portrait.png"];
3     imgView.userInteractionEnabled=YES;
4     UITapGestureRecognizer *singleTap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(onClickPortraitImage)];
5     [imgView addGestureRecognizer:singleTap];
6     [self.view addSubview:imgView];

2、响应点��M��?/div>

1 -(void)onClickPortraitImage{
2
3     NSLog(@"囄��被点�?");
4 }

开发工具Xcode5 �pȝ��版本�Q?font face="Heiti SC Light">OS X 10. 9. 3 ( 13D65 )

王�v�?/a> 2014-05-28 14:33 发表评论