屏幕旋转

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了解UIWindow——UIWindow实践
iOS屏幕旋转问题总结
IOS：屏幕旋转与变换
[转换属性详解](http : //www.cnblogs.com/iCocos/p /4639162.html)
IOS 设备旋转的内部处理流程以及一些【优化建议】
[iOS 的全局禁止横屏，但UIWebView的全屏播放视频支，横屏](http : //www.cnblogs.com/piaojin/p/5089127.html)

有时候我们需要判断应用程序当前的方向，可以通过获取设备当前的方向来确定，从下面的定义你可以看到

UIInterfaceOrientation的定义是通过UIDeviceOrientation来完成的，有两个概念：

UIDeviceOrientation：硬件设备的方向(设备的物理方向)
UIInterfaceOrientation：应用程序界面的方向(界面显示的方向)
UIInterfaceOrientationMask:应用程序屏幕支持的旋转方向

UIDeviceOrientation:

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;    
if (UIDeviceOrientationIsLandscape(deviceOrientation))   
    NSLog(@"The orientation is landscape");        
else if(UIDeviceOrientationIsPortrait(deviceOrientation))   
    NSLog(@"The orientation is portrait");

UIInterfaceOrientation:

UIInterfaceOrientation orientation =  [UIApplication sharedApplication].statusBarOrientation;
if (orientation== UIInterfaceOrientationLandscapeLeft ||orientation== UIInterfaceOrientationLandscapeRight) {
          NSLog(@"The orientation is landscape");
        }

UIInterfaceOrientationMask:


 UIInterfaceOrientationMask orientationMask =[[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:[UIApplication sharedApplication].keyWindow];
 
 if ([UIDevice currentDevice].userInterfaceIdiom ==UIUserInterfaceIdiomPad) {
 
        if (orientationMask != UIInterfaceOrientationMaskAll) {
            if (orientation== UIInterfaceOrientationLandscapeLeft ||orientation== UIInterfaceOrientationLandscapeRight) {
                windowframe =CGRectMake(frame.origin.y, frame.origin.x, frame.size.height, frame.size.width);
            }
            
        }
    }

1. 方案一

设置不可旋转
设置不支持屏幕旋转，并设置默认方向为正常反向。设置后会发现，凡是添加到根控制器的视图控制器都不再支持左右横屏

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}
- (BOOL)shouldAutorotate
{
    return NO;
}
- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;//只支持这一个方向(正常的方向)
}

/**重点：
根控制器的位置：
1.如果在UIViewController上，则在UIViewController对应的.m文件中加入三个函数即可。
2.如果在UITabBarController上，则在UITabBarController对应的.m文件中加入三个函数即可。
3.如果在UINavigationController上，则在UINavigationController对应的.m文件中加入三个函数即可。

(不按情况执行，问题无法解决)
*/

在需要横屏的控制器执行左右横屏

- (BOOL)shouldAutorotate
{
    return Yes;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
}

2.方案二

以导航控制器为跟控制器为例：

#pragma 横竖屏
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return (toInterfaceOrientation == UIInterfaceOrientationMaskPortrait);
}
- (BOOL)shouldAutorotate
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
        return YES;
    }
    return NO;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
         return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
    }
    return UIInterfaceOrientationMaskPortrait;
}

3.方案三强制横竖屏

私有方法无法通过APPStore审核
这是网络上可以查到的一般解决方法，用在iPhone上的APP上效果显着。不过，如果你用iPad上运行项目后会发现，需求还没有完成。在iPad上处于横屏的状态下运行的应用程序，会发现应用里的视图是横屏显示的。这时，根控制器默认是不支持屏幕旋转的，所以整个APP一直处于横屏状态。当然，实现的MPMoviePlayerViewController子类还是可以正常旋转的。所以，我们只要将应用在iPad上横屏状态下，也能以正常竖屏方向进入应用就OK了！

/**
  *强制转成竖屏:
  */
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
            SEL selector = NSSelectorFromString(@"setOrientation:");
            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
            [invocation setSelector:selector];
            [invocation setTarget:[UIDevice currentDevice]];
            int val = UIInterfaceOrientationPortrait;
            [invocation setArgument:&val atIndex:2];
            [invocation invoke];
 }

/**
     *  强制竖屏
     */
    NSArray * selectorNameCharacterArray = @[@"s",@"e",@"t",@"O",@"r",@"i",@"e",@"n",@"t",@"a",@"t",@"i",@"o",@"n",@":"];
    NSString * selectorName = [selectorNameCharacterArray componentsJoinedByString:@""];
    SEL selector = NSSelectorFromString(selectorName);
    if ([[UIDevice currentDevice] respondsToSelector:selector]) {
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = UIInterfaceOrientationPortrait;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }

4. 方案四通过判断状态来控制

- (void)deviceOrientationDidChange: (NSNotification *)notification
{
    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    CGFloat startRotation = [[self valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
    CGAffineTransform rotation;
    switch (interfaceOrientation) {
        case UIInterfaceOrientationLandscapeLeft:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 270.0 / 180.0);
            break;
        case UIInterfaceOrientationLandscapeRight:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 90.0 / 180.0);
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 180.0 / 180.0);
            break;
        default:
            rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);
            break;
    }
    view.transform = rotation;
}

应用在iPad的上运行时，所有视图都只会支持竖屏方向，为了让视频播放的视图能够支持横竖屏旋转，需要用到变换属性来模拟系统的横竖屏效果。

这里是建立在方案二的基础上实现的

#pragma 横竖屏
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return (toInterfaceOrientation == UIInterfaceOrientationMaskPortrait);
}
- (BOOL)shouldAutorotate
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return NO;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
        if (iPad) {
            UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
            if (UIDeviceOrientationIsLandscape(deviceOrientation)){
                switch (deviceOrientation) {
                    case 3:
                    {
                        [UIView beginAnimations:nil context:nil];
                        [UIView setAnimationDuration:0.5];
                        self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.width);
                        self.presentedViewController.view.transform = CGAffineTransformMakeRotation(-M_PI*1.5);
                        [UIView commitAnimations];
                        [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];
                    }
                        break;
                    case 4:
                    {
                        [UIView beginAnimations:nil context:nil];
                        [UIView setAnimationDuration:0.5];
                        self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.width);
                        self.presentedViewController.view.transform = CGAffineTransformMakeRotation(M_PI*1.5);
                        [UIView commitAnimations];
                        [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];

                    }
                        break;
                    default:
                        break;
                }
            }else{
                [UIView beginAnimations:nil context:nil];
                [UIView setAnimationDuration:0.5];
                self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
                self.presentedViewController.view.transform = CGAffineTransformMakeRotation(0);
                [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];
                [UIView commitAnimations];

            }
        }
                return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
    }
    return UIInterfaceOrientationMaskPortrait;
}

屏幕旋转

屏幕旋转

推荐文档

1. 方案一

2.方案二

3.方案三 强制横竖屏

4. 方案四 通过判断状态来控制

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3.方案三强制横竖屏

4. 方案四通过判断状态来控制