如何在設備更改時立即檢測UIInterfaceOrientation方向（人像，風景）

Question

我創建UITableViewCell，並且當用戶將風景改變爲縱向或縱向時，我試圖檢查相同的代碼，但不自動檢測。

- CellForRowAtIndexPath 
{ 
    if (UIDeviceOrientationIsPortrait(self.interfaceOrientation)) 
    { 
     [Button setFrame:CGRectMake([[UIScreen mainScreen] bounds].size.width - 50, 20, 50, 50)]; 
    }else 
    { 
     [Button setFrame:CGRectMake([[UIScreen mainScreen] bounds].size.height - 70, 20, 50, 50)]; 
    } 
} 

Answer 1

一種方法是把這些東西加到你的viewController：

- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { 
    // will rotate 
} 
- (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { 
    // will animate rotation 
} 
- (void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { 
    // done rotating 
} 

或者，您可以註冊通知：

[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(orientationDidChange:) 
              name:UIDeviceOrientationDidChangeNotification 
              object:self];