如何檢查UIAlertView的返回值？

Question

我想檢查用戶是否點擊「是」，例如我想要採取某種行動。

這是我的代碼行：

UIAlertView* mes=[[UIAlertView alloc] initWithTitle:@"Are you sure?" message:@"this will start a new game" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil]; 

    [mes show]; 

所以我想說if user tap "yes" preform this action

這是我的方法：我想說的是，如果用戶點擊「是」創建新的遊戲。

- (IBAction)newGame:(UIButton *)sender { 

    UIAlertView* mes=[[UIAlertView alloc] initWithTitle:@"Are you sure?" message:@"this will start a new game" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil]; 

    [mes show]; 


    self.flipsCount = 0; 
    self.game = nil; 
    for (UIButton *button in self.cardButtons) { 
     Card *card = [self.game cardAtIndex:[self.cardButtons indexOfObject:button]]; 
     card.unplayble = NO; 
     card.faceUp = NO; 
     button.alpha = 1; 
    } 

    self.notificationLabel.text = nil; 
    [self updateUI]; 
} 

Answer 1

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { 
    if (buttonIndex != [alertView cancelButtonIndex]) 
    { 
     //User clicked ok 
     NSLog(@"ok"); 
     [self newGame:[UIButton alloc] ]; 
    } 
    else 
    { 
     //User clicked cancel 
     NSLog(@"cancel"); 
    } 
} 

它將ButtonIndex值從左到右。

Answer 2

使用的UIAlertView委託方法

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
    if (buttonIndex == 1)//Yes 
    { 
     self.flipsCount = 0; 
     self.game = nil; 
     for (UIButton *button in self.cardButtons) 
     { 
      Card *card = [self.game cardAtIndex:[self.cardButtons indexOfObject:button]]; 
      card.unplayble = NO; 
      card.faceUp = NO; 
      button.alpha = 1; 
     } 

     self.notificationLabel.text = nil; 
     [self updateUI]; 
    } 
    else//No 
    { 
     //do something 
    } 
} 

Answer 3

將下面的方法在同一類（或類已設置爲delegate）：

- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
    if (buttonIndex == 0) 
    { 
    //User clicked ok 
    } 
    else 
    { 
    //User clicked cancel 
    } 
}