iPhone SDK：如何隱藏警示框？

Question

我使用下面的代碼來顯示一個對話框：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Info" message:@"My Message" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
[alert show]; 
[alert release]; 

你能告訴我如何再次隱藏警告框手機的變化方向是什麼時候？

Answer 1

首先，您必須在界面中保存對警報的引用。

@interface MyViewController : UIViewController { 
    UIAlertView *alert; 
} 
@property (nonatomic, retain) IBOutlet UIAlertView *alert; 

當您創建警報使用

self.alert = [[[UIAlertView alloc] initWithTitle:@"Info" message:@"My Message" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease]; 
[alert show]; 

，然後你必須添加另一種方法didRotateFromInterfaceOrientation:

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { 
    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation]; 
    [alert dismissWithClickedButtonIndex:[alert cancelButtonIndex] animated:YES]; 
    self.alert = nil; 
}