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冷锋 — Wed, 21 Dec 2011 11:30:00 GMT

做过几次有关UIView坐标变换的，但是�l�常不能得到自己惌��的效果，今天��把它仔�l�研�I�了下。记下来�{�以后忘记的时候再复习

重写shouldAutorateToInterfaceOrientation:�Q�限制某个方�?/span>会改变原点的位置�Q�原点会一直保持在左上角，但已�l�不是原来的左上角了

setStatusBarOrientation.改变状态栏的方向。它不会改变原点的位�|�，但会改变键盘的方�?/span>

旋�{�?/span>self.myview�?/span>frame ={0,0,320,50}

CGAffineTransform at =CGAffineTransformMakeRotation(M_PI/2);

[self.myview setTransform:at];

旋�{�?/span>frame={135,-135,50,320},视图的所有像素旋�?/span>90�?/span>

坐标是相对于父视囄��

假如view已经转成竖的�Q�这旉��过讄��frame而不是通过setTransform强制成横的话�Q�会截掉部分囑փ�

坐标多次变换的合成，要以被变换的view的局部坐标系为参照，比如

testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
UILabel*label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 20)];
label.text =@"Test";
label.tag=100;
[testView addSubview:label];
此时�?nbsp;frame ={0,0,320,50}

CGAffineTransform at =CGAffineTransformMakeRotation(M_PI/2);先顺旉��旋�{90
at =CGAffineTransformTranslate(at,200,0);,
[self.testView setTransform:at];

此时�?/span> frame ={135,65,50,320},可以看到宽高已经反过来了�Q?/span>view中的像素方向也改变了�Q�而如果只是用setFrame来改变宽高的话是不会改变像素方向�?/span>

冷锋 2011-12-21 19:30 发表评论

UIWebView加上safari风格前进后退按钮

冷锋 — Thu, 02 Jun 2011 14:46:00 GMT

今天在写�E�序内打开�|�页的功能，写工��h��的时候发现系�l�图标里面竟然没有后退按钮�Q�，�׃��我这个是静态库工程�Q�不可能自己弄张图上去，不然使用本库的时候还得附上图片，�l�过一下午的搜索，�l�于扑ֈ�个比较靠��q��Q�这哥们��是用代码给��d��来个��头�?话说如果是其他不规则的图形要咋办呢？)�Q�还是google��用啊，baidu非常非常非常。。。垃圾�?

Code Example: Drawing the iPhone Back Button�Q��{载）

Recently, I had need to provide a back button similar to the one used in Mobile Safari for a consulting project.

Many of the buttons used in the built-in iPhone applications are made available via the SDK with built in button types and graphics. Unfortunately, the back button is not one of these.

Because I needed to display the toolbar button from inside a static library which can not include images, I had to render the back arrow directly in code.

Since this was a bit time consuming, I thought I would share in hopes that it saves someone else a little bit of time.

- (CGContextRef)createContext
{
// create the bitmap context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(nil,27,27,8,0,
colorSpace,kCGImageAlphaPremultipliedLast);
CFRelease(colorSpace);
return context;
}
- (CGImageRef)createBackArrowImageRef
{
CGContextRef context = [self createContext];
// set the fill color
CGColorRef fillColor = [[UIColor blackColor] CGColor];
CGContextSetFillColor(context, CGColorGetComponents(fillColor));
CGContextBeginPath(context);
CGContextMoveToPoint(context, 8.0f, 13.0f);
CGContextAddLineToPoint(context, 24.0f, 4.0f);
CGContextAddLineToPoint(context, 24.0f, 22.0f);
CGContextClosePath(context);
CGContextFillPath(context);
// convert the context into a CGImageRef
CGImageRef image = CGBitmapContextCreateImage(context);
CGContextRelease(context);
return image;
}
- (UIBarButtonItem *)backButton
{
CGImageRef theCGImage = [self createBackArrowImageRef];
UIImage *backImage = [[UIImage alloc] initWithCGImage:theCGImage];
CGImageRelease(theCGImage);
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:backImage
style:UIBarButtonItemStylePlain
target:self.webView
action:@selector(goBack)];
[backImage release], backImage = nil;
return [backButton autorelease];
}

冷锋 2011-06-02 22:46 发表评论

冷锋 — Fri, 27 May 2011 01:23:00 GMT

最�q�调试iphone��目�Ӟ��发现使用静态库时调用函数A会直接蟩到B函数��M��Q�后来才发现原来使用静态库函数时是�Ҏ��头文件的函数声明��序��d��位函数的�Q�由于我的静态库的头文�g的函数声明顺序跟使用库时��d��的头文�g里的函数声明��序不一��_��D��了杯��P��|�上搜烦了下有些��是按头文件来搜烦函数的，有些人又说不是，莫非各个�q�_��都不一��P��求解�{�，有木�?..

冷锋 2011-05-27 09:23 发表评论