目標取向shouldAutorotate

Question

我想允許應轉動的基礎上，目標方位

[[UIDevice currentDevice] orientation] 

然而，在shouldRotate使用時，上面的代碼，保存當前（舊）方向，而不是目標方位

- (BOOL) shouldAutorotate { 

    return YES; 
} 

Answer 1

好吧，我想通了。在shouldAutorotate返回YES總是然後做到這一點：

- (NSUInteger)supportedInterfaceOrientations 
{ 
    if ([UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft) { 
     // Allow if you can 
    } else if ([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait) { 
     // Allow if you can 
    } 
    // so on 
} 

Answer 2

除了是返回

-(BOOL)shouldAutorotate 
{ 
return YES; 
} 

你必須實現

個

- (NSUInteger)supportedInterfaceOrientations 
{ 
    return UIInterfaceOrientationMaskLandscape; 
} 

不同的掩碼可用是：

UIInterfaceOrientationMaskPortrait 
UIInterfaceOrientationMaskLandscapeLeft 
UIInterfaceOrientationMaskLandscapeRight 
UIInterfaceOrientationMaskPortraitUpsideDown 
UIInterfaceOrientationMaskLandscape 
UIInterfaceOrientationMaskAll 
UIInterfaceOrientationMaskAllButUpsideDown 

您還可以看到：

https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/supportedInterfaceOrientations

Answer 3

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 

此方法應該爲你做的伎倆。 toInterfaceOrientation保持目標方向。