UIAlertView didmissWithClickedButtonIndex並不關閉警報

Question

從處理Web服務連接的對象中，當網絡發生故障時，我將警報傳遞給使用Web服務對象的視圖控制器。

WebServiceObject：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"Connection failed! You must be connected to a Wifi source to download data. Please reconnect to a Wifi source and try again later."] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil]; 
    NSDictionary *alertDict = [NSDictionary dictionaryWithObjectsAndKeys:alert, @"AlertView", nil]; 
    [[NSNotificationCenter defaultCenter] postNotificationName:DisplayAlertNotification object:self userInfo:alertDict]; 

的ViewController：

- (void)displayAlert:(NSNotification *)notification { 
    NSDictionary *dict = [notification userInfo]; 
    if ([[dict objectForKey:@"AlertView"] isKindOfClass:[UIAlertView class]]) { 
     UIAlertView *alert = [dict objectForKey:@"AlertView"]; 
       NSNumber *theTag = [dict objectForKey:@"AlertTag"]; 
    NSLog(@"%i", [theTag integerValue]); 
    alert.tag = [[dict objectForKey:@"AlertTag"] integerValue]; 
     [alert show]; 
    } 
} 


- (void)removeAlert:(NSNotification *)notification { 
    NSDictionary *dict = [notification userInfo]; 
    if ([[dict objectForKey:@"AlertTag"] isKindOfClass:[NSNumber class]]) { 
     NSNumber *theTag = [dict objectForKey:@"AlertTag"]; 
     UIAlertView *alert = (UIAlertView *)[self.view viewWithTag:[theTag integerValue]]; 
     // Not sure why but my alert is nil at this point 
     [alert dismissWithClickedButtonIndex:0 animated:YES]; 
    } 
} 

我也用removeAlert方法以同樣的方式以編程方式刪除警報。這樣做的目標是，如果網絡發生故障，但用戶沒有點擊確定，然後網絡恢復運行，我將關閉網絡失敗警報，並顯示網絡恢復警報。它的工作原理除了解除警報並顯示網絡恢復後，一旦用戶在恢復網絡上單擊確定，原始網絡故障僅恢復一次。如果用戶在出現「網絡失敗」時單擊「確定」，它將不會恢復。

我是否以正確的方式解除警報？謝謝。

編輯：我可以通過在WebServiceObject中保存一個引用並以這種方式解除引用來實現它。

Answer 1

你設置警戒到零，所以它什麼都不做

alert = nil; 

[alert dismissWithClickedButtonIndex:0 animated:YES];