处理IPhone屏幕的旋转是我们经常遇到的，当你做一个应用既然满足竖屏又要满足横屏，这就要求我们会处理屏幕旋转的问题！

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方法一：自动布局

1.将项目中界面的四种手持方式都点上；

2.取消Use Autolayout;

3.选择界面中某个控件然后到属性工具栏中去找到AutoSizing功能，勾选对应的绝对定位的线条

4.重写可以旋转的方法

-(BOOL)shouldAutorotate {     return YES; } -(NSUInteger)supportedInterfaceOrientations {     return UIInterfaceOrientationMaskAll; } 

方法二：手动布局一（通过代码改view种控件的坐标）

1.重写可以旋转的方法

-(BOOL)shouldAutorotate {     return YES; } -(NSUInteger)supportedInterfaceOrientations {     return UIInterfaceOrientationMaskAll; } 

2.勾选上项目中支持的四种手持类型

3.取消Use Autolayout

4.代码实现：

//每当屏幕旋转的时候都会触发一个 -(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {     //如果是是横屏状态     if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft )     {         self.l1.frame = CGRectMake(20, 25, 110, 110);         self.l2.frame = CGRectMake(162, 25, 110, 110);         self.l3.frame = CGRectMake(304, 25, 110, 110);         self.r1.frame = CGRectMake(20, 178, 110, 110);         self.r2.frame = CGRectMake(162, 178, 110, 110);         self.r3.frame = CGRectMake(304, 178, 110, 110);} }

方法三：手动布局二（在xib中新建一个支持横屏的view通过双view切换实现）

1.在xib文件中拖一个view控件，选择Orientation属性为横屏

2.布局好界面

3.将横纵view分别在controller.h文件中创建对应的属性，命名为

@property (retain, nonatomic)IBOutletUIView *landspaceView;

@property (retain, nonatomic)IBOutletUIView *portatiorView;

4.代码实现

宏定义实现角度转弧度

#define degreesToRadia(x) (M_PI * (x) / 180)//参数要加括号 ，尤其是参数附近特别要加括号

-(BOOL)shouldAutorotate {     return YES; } -(NSUInteger)supportedInterfaceOrientations {     return UIInterfaceOrientationMaskAll; } //每当屏幕旋转的时候都会触发一个 -(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {     //如果是是横屏状态     if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft )     { //        self.l1.frame = CGRectMake(20, 25, 110, 110); //        self.l2.frame = CGRectMake(162, 25, 110, 110); //        self.l3.frame = CGRectMake(304, 25, 110, 110); //        self.r1.frame = CGRectMake(20, 178, 110, 110); //        self.r2.frame = CGRectMake(162, 178, 110, 110); //        self.r3.frame = CGRectMake(304, 178, 110, 110);         self.view = self.landspaceView;         //self.view.transform = CGAffineTransformIdentity;         self.view.transform = CGAffineTransformMakeRotation(degreesToRadia(270));         self.view.bounds = CGRectMake(0, 0, 480, 300);     }     else if(toInterfaceOrientation == UIInterfaceOrientationLandscapeRight)     { //        self.l1.frame = CGRectMake(37, 20, 110, 110); //        self.l2.frame = CGRectMake(37, 162, 110, 110); //        self.l3.frame = CGRectMake(37, 304, 110, 110); //        self.r1.frame = CGRectMake(190, 20, 110, 110); //        self.r2.frame = CGRectMake(190, 162, 110, 110); //        self.r3.frame = CGRectMake(190, 304, 110, 110);         self.view = self.landspaceView;         //self.view.transform = CGAffineTransformIdentity;         self.view.transform = CGAffineTransformMakeRotation(degreesToRadia(90));         self.view.bounds = CGRectMake(0, 0, 480, 300);     }     else if (toInterfaceOrientation == UIInterfaceOrientationPortrait)     {         self.view = self.portatiorView;         self.view.transform = CGAffineTransformIdentity;         self.view.bounds = CGRectMake(0, 0, 320, 460);     }     else if(toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)     {         self.view = self.portatiorView;         //self.view = self.landspaceView;         //self.view.transform = CGAffineTransformIdentity;         self.view.transform = CGAffineTransformMakeRotation(degreesToRadia(180));         self.view.bounds = CGRectMake(0, 0, 320, 460);     } } 

模拟屏幕旋转
commond + 方向键
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