iOS實現手動和自動螢幕旋轉

2022-07-20 18:03:27

本文範例為大家分享了iOS實現手動和自動螢幕旋轉的具體程式碼，供大家參考，具體內容如下

首先iPhone中螢幕分為狀態列方向和裝置方向

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
};

系統提供兩個地方來設定裝置的方向，取兩個地方的交集是最後的裝置所支援的方向

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

這裡需要注意的是返回的時下面的列舉

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),
};

在轉動螢幕的時候會觸發下面方法

-(BOOL)shouldAutorotate；

在該方法返回真,自動呼叫上面的兩個方法得到方向。

修改狀態列方向的方法

1、使用私有API setOrientation;
2、修改狀態列的方向，並通過設定View的transform來達到偽旋轉的結果，但是裝置方向並沒有改變
3、主動出發系統支援的方法，就相當於讓這個vc在重新出來的時候系統判斷所支援的方向的機制重新走一遍。

- (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;
}

在需要轉為豎屏的時候呼叫一個方法，在後面兩個方法中如上實現，第二個方法中返回的是你最終要轉向的方向。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援it145.com。

iOS實現手動和自動螢幕旋轉

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