IOS9之后强制横屏方法

1、IOS8之后有的方法写到类里强制横屏之后已经没有用了

-(BOOL)shouldAutorotate{

    return NO;

}

-(UIInterfaceOrientationMask)supportedInterfaceOrientations{

    return UIInterfaceOrientationMaskLandscape;

}

2、IOS8之后该怎么实现强制横屏

首先在代理类实现该方法：

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

    if (self.isForceLandscape) {

        return UIInterfaceOrientationMaskLandscape;

    }else if (self.isForcePortrait){

        return UIInterfaceOrientationMaskPortrait;

    }

    return UIInterfaceOrientationMaskAll;

}

然后在代理类头文件里定义2个全局变量

/**

 *  是否强制横屏

 */

@property  BOOL isForceLandscape;

/**

 *  是否强制竖屏

 */

@property  BOOL isForcePortrait;

最后一步，在你所需要实现强制横屏的ViewController里添加如下方法

#pragma  mark 横屏设置

/**

 *  强制横屏

 */

-(void)forceOrientationLandscape{

    //这种方法，只能旋转屏幕不能达到强制横屏的效果

    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 = UIInterfaceOrientationLandscapeLeft;

        [invocation setArgument:&val atIndex:2];

        [invocation invoke];

    }

    //加上代理类里的方法，旋转屏幕可以达到强制横屏的效果

    AppDelegate *appdelegate=(AppDelegate *)[UIApplication sharedApplication].delegate;

    appdelegate.isForceLandscape=YES;

    [appdelegate application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:self.view.window];

    

}

/**

 *  强制竖屏

 */

-(void)forceOrientationPortrait{

    

    //加上代理类里的方法，旋转屏幕可以达到强制竖屏的效果

    AppDelegate *appdelegate=(AppDelegate *)[UIApplication sharedApplication].delegate;

    appdelegate.isForcePortrait=YES;

    [appdelegate application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:self.view.window];

    

}

/**

 *  页面消失需要释放强制约束

 *

 *  @param animated <#animated description#>

 */

-(void)viewWillDisappear:(BOOL)animated{

    //释放约束

    AppDelegate *appdelegate=(AppDelegate *)[UIApplication sharedApplication].delegate;

    appdelegate.isForcePortrait=NO;

    appdelegate.isForceLandscape=NO;

    [appdelegate application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:self.view.window];

    //退出界面前恢复竖屏

    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];

    }

}

-(void)viewDidAppear:(BOOL)animated{

    //[self forceOrientationPortrait];  //设置竖屏

    [self forceOrientationLandscape]; //设置横屏

}