iOS 某一个界面实现强制横屏

原文地址：http://blog.csdn.net/dream9393/article/details/75305152

需求： 
让push的ViewController界面强制横屏

一、配置 

二、添加强制横屏方法

#pragma mark -- 强制转换横屏
- (void)orientationToPortrait:(UIInterfaceOrientation)orientation {

    SEL selector = NSSelectorFromString(@"setOrientation:");
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
    [invocation setSelector:selector];
    [invocation setTarget:[UIDevice currentDevice]];
    int val = orientation;
    [invocation setArgument:&val atIndex:2];//前两个参数已被target和selector占用
    [invocation invoke];
}

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三、在需要跳转的方法中调用上述方法，令其转换屏幕

    [self orientationToPortrait:UIInterfaceOrientationLandscapeLeft];

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四、返回竖屏的方法中调用

    [self orientationToPortrait:UIInterfaceOrientationPortrait];

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