iOS两个强制旋转屏幕的方法

第一个：

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 = UIInterfaceOrientationLandscapeRight;            [invocation setArgument:&val atIndex:2];            [invocation invoke];        }