iOS横竖屏的问题

最近做的项目要求大部分只支持竖屏，只有少部分页面才能横竖屏切换。

1.如果根控制器是UITabBarController，需要创建一个UITabBarController的子类，并重写这几个方法

-(BOOL)shouldAutorotate

{

return [self.selectedViewController shouldAutorotate];

}

#if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_9_0

- (NSUInteger)supportedInterfaceOrientations

#else

- (UIInterfaceOrientationMask)supportedInterfaceOrientations

#endif

{

return [self.selectedViewController supportedInterfaceOrientations];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

return [self.selectedViewController preferredInterfaceOrientationForPresentation];

}

2.如果根控制器是UINavigationController，需要创建UINavigationController子类，并重写这几个方法

-(BOOL)shouldAutorotate

{

return [[self.viewControllers lastObject] shouldAutorotate];

}

#if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_9_0

- (NSUInteger)supportedInterfaceOrientations

#else

- (UIInterfaceOrientationMask)supportedInterfaceOrientations

#endif

{

return [[self.viewControllers lastObject] supportedInterfaceOrientations];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];

}

3.之后在每个控制器里根据需求来重写下面的方法如：

// 不支持设备旋转

- (BOOL)shouldAutorotate

{

return false;

}

//支持的方向

-(UIInterfaceOrientationMask)supportedInterfaceOrientations

{

return UIInterfaceOrientationMaskPortrait;

}