IOS指定页面旋转

最新推荐文章于 2020-12-31 06:23:12 发布

原创最新推荐文章于 2020-12-31 06:23:12 发布 · 488 阅读

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#ios #页面旋转

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博主在做视频全屏播放项目时，因应用整体不支持横屏，需关闭其他页面屏幕自适应旋转，开启视频页面旋转。文中给出实现思路，要在AppDelegate.m中实现方法，在特定方法里注册监听，在需旋转页面发通知，退出页面发关闭旋转通知。

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本人在做视频全屏播放的项目中遇到的问题，应用整体是不支持横屏的。因为全屏使用的是触发手机横屏的机制，所以其他页面需要关闭屏幕自适应旋转，视频页面则开启屏幕的自适应旋转。实现代码如下：

在AppDelegate.m 中实现下面方法

- (void)initializeTheNotificationCenter
{
    //在进入需要全屏的界面里面发送允许横屏的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(startFullScreen) name:kStartFullScreen object:nil];//允许横屏
    
    //在退出允许横屏的界面里面发送退出横屏的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endFullScreen) name:kendFullScreen object:nil];//退出横屏
}

#pragma mark 允许横屏
-(void)startFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = YES;
}

#pragma mark    退出横屏
-(void)endFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = NO;
    
    //强制归正：
    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];
    }
}

#pragma mark    禁止横屏
- (UIInterfaceOrientationMask )application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if (self.allowRotation) {
        return UIInterfaceOrientationMaskAll;
    }
    return UIInterfaceOrientationMaskPortrait;
}

记得在

(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 中注册监听

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
....
[self initializeTheNotificationCenter];
...

然后在需要旋转的页面发送通知，退出页面发送关闭旋转通知

    [[NSNotificationCenter defaultCenter] postNotificationName:kStartFullScreen object:nil];

    [[NSNotificationCenter defaultCenter] postNotificationName:kendFullScreen object:nil];