iOS 怎样切换横竖屏

上一篇文章是写我实现横竖屏之后遇到的问题,这里说一下是怎么实现横竖屏的

首先,因为我做的是其他页面禁止横屏,只要一个页面横屏,那么第一步,需要在AppDelegate中设置只能竖屏 然后在指定界面开启横屏.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.spOrientation = UIInterfaceOrientationMaskPortrait;

    return YES;

    

}

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{

    

    return self.spOrientation;

}

下面是指定页面开启横屏

-(void)viewWillAppear:(BOOL)animated{

    AppDelegate * delegate = [UIApplication sharedApplication].delegate;

    delegate.spOrientation =  UIInterfaceOrientationMaskAll;

}

-(void)viewWillDisappear:(BOOL)animated{

    AppDelegate * delegate = [UIApplication sharedApplication].delegate;

    delegate.spOrientation =  UIInterfaceOrientationMaskPortrait;

}

因为前一个页面要求禁止横屏 则需要在上一个页面写 

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    

    [[UIDevice currentDevice] setValue: [NSNumber numberWithInteger: UIInterfaceOrientationPortrait] forKey:@"orientation"];

}

这样就做到横竖屏切换啦