iOS 强制转成横屏的方式

一直遇到这个问题,今天终于找到了解决方法.

在我们的项目中经常遇到横竖屏切换,而又有某个特定的界面必须是特定的显示方式(横屏或竖屏).这就需要如下的处理了.

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);

            break;

        default:

            rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);

            break;

    }

    view.transform = rotation;

}