iOS手动和自动屏幕旋转

时间:2022-09-28 z15083415803 人气:0

首先iPhone中屏幕分为状态栏方向和设备方向

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,              // Device oriented flat, face up
    UIDeviceOrientationFaceDown             // Device oriented flat, face down
};

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
    UIInterfaceOrientationUnknown            = UIDeviceOrientationUnknown,
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
};

系统提供两个地方来设置设备的方向，取两个地方的交集是最后的设备所支持的方向

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window;
-(NSUInteger)supportedInterfaceOrientations;

这里需要注意的是返回的时下面的枚举

typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {
    UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),
    UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),
    UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),
    UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),
    UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
    UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),
    UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
};

在转动屏幕的时候会触发下面方法

-(BOOL)shouldAutorotate；

在该方法返回真,自动调用上面的两个方法得到方向。

修改状态栏方向的方法

1、使用私有API setOrientation;
2、修改状态栏的方向，并通过设置View的transform来达到伪旋转的结果，但是设备方向并没有改变
3、主动出发系统支持的方法，就相当于让这个vc在重新出来的时候系统判断所支持的方向的机制重新走一遍。

- (void)awakeSupportInterOrtation:(UIViewController *)showVC completion:(void(^)(void))block
{
    UIViewController *vc = [[UIViewController alloc] init];
    void(^completion)() = ^() {
        [showVC dismissViewControllerAnimated:NO completion:^{
            if (block)
            {
                block();
            }
        }];
    };

    // This check is needed if you need to support iOS version older than 7.0
    BOOL canUseTransitionCoordinator = [showVC respondsToSelector:@selector(transitionCoordinator)];

    if (canUseTransitionCoordinator)
    {
        [showVC presentViewController:vc animated:NO completion:nil];
        [showVC.transitionCoordinator animateAlongsideTransition:nil completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
            completion();
        }];
    }
    else
    {
        [showVC presentViewController:vc animated:NO completion:completion];
    }
}

-(NSUInteger)supportedInterfaceOrientations
{
        return UIInterfaceOrientationMaskPortrait;
}

-(BOOL)shouldAutorotate
{
    return YES;
}

在需要转为竖屏的时候调用一个方法，在后面两个方法中如上实现，第二个方法中返回的是你最终要转向的方向。

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