今天项目中遇到正在看视频的时候账号被挤，如果当时是横屏的情况下，需要强制竖屏。真头疼，网上找了好多方法，终于解决啦。O(∩_∩)O~

强制横屏：

[self interfaceOrientation:UIInterfaceOrientationLandscapeRight];

强制竖屏：

[self interfaceOrientation:UIInterfaceOrientationPortrait];

强制转屏

- (void)interfaceOrientation:(UIInterfaceOrientation)orientation
{
    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 = orientation;
        // 从2开始是因为0 1 两个参数已经被selector和target占用
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }
}