iOS屏幕旋转

开发过程中，总是遇到一个或多个ViewController需要支持屏幕旋转，而其他不需要的情况，故需要特殊处理需要旋转的ViewController，而不影响其他。

iOS的屏幕旋转是由根视图控制的，只要重写根视图的-(BOOL)shouldAutorotate和-(UIInterfaceOrientationMask)supportedInterfaceOrientations方法即可，当前举例以UITabBarController+UINavigationController：

选择Device Orientation

Device Orientation

新建类别UITabBarController+Orientation

@implementation UITabBarController (Orientation)

- (BOOL)shouldAutorotate
{
    return [self.selectedViewController shouldAutorotate];
}

- (NSUInteger)supportedInterfaceOrientations
{
    return [self.selectedViewController supportedInterfaceOrientations];
}

@end

UINavigationController+Orientation

@implementation UINavigationController (Orientation)

- (BOOL)shouldAutorotate
{
    return [self.topViewController shouldAutorotate];
}

- (NSUInteger)supportedInterfaceOrientations
{
    return [self.topViewController supportedInterfaceOrientations];
}

@end

UIViewController+Orientation

@implementation UIViewController (Orientation)

- (BOOL)shouldAutorotate
{
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

@end

这样处理之后，UIViewController默认仅支持垂直方向，若有支持多方向需求，再单独重写Controller的-(BOOL)shouldAutorotate和-(UIInterfaceOrientationMask)supportedInterfaceOrientations方法即可。

Demo下载