iOS 强制转成横屏的方式

强制转成横屏:

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 = UIInterfaceOrientationLandscapeRight;

            [invocation setArgument:&val atIndex:2];

            [invocation invoke];

        }

以上代码支持ARC哟.
方法二： 通过判断状态栏来设置视图的transform属性。

- (void)deviceOrientationDidChange: (NSNotification *)notification
{
    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    CGFloat startRotation = [[self valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
    CGAffineTransform rotation;
    switch (interfaceOrientation) {
        case UIInterfaceOrientationLandscapeLeft:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 270.0 / 180.0);
            break;
        case UIInterfaceOrientationLandscapeRight:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 90.0 / 180.0);
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 180.0 / 180.0);
            br
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        default:
            rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);
            break;
    }
    view.transform = rotation;
}