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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