Question

我正在创建一个自定义委托UIAlertView的alert:buttonClickedAtIndex:方法，但它无法正常工作。我正在为UIView创建子类，我有两个标记为0和1的按钮。当我去检查自定义视图的委托时，这仍然不起作用。这是我做的代码。

自定义视图

- (void) buttonTouchedWithIdentifier:(NSInteger)identifier
{
if (identifier == 0) {
    [self.delegate alert:self didClickButtonWithTagIdentifier:0];
}
if (identifier == 1) {
    [self.delegate alert:self didClickButtonWithTagIdentifier:1];
}
}

* in my showInViewMethod *
[self.dismissButton addTarget:self action:@selector(buttonTouchedWithIdentifier:) forControlEvents:UIControlEventTouchDown];
[self.continueButton addTarget:self action:@selector(buttonTouchedWithIdentifier:) forControlEvents:UIControlEventTouchDown];

self.dismissButton.tag  = 0;
self.continueButton.tag = 1;



* in my view controller *

nextLevelAlert = [[ARAlert alloc] init];
nextLevelAlert.delegate = self;
[nextLevelAlert showInView:self.view
      withMessage:[NSString stringWithFormat:@"Congratulations, you have completed level %i.\nWould you like to continue?", levelNumber]
  dismissButtonTitle:@"Menu"
 continueButtonTitle:@"Next Level"];

- (void)alert:(ARAlert *)alert didClickButtonWithTagIdentifier:(NSInteger)tagId
{
    if (alert == nextLevelAlert) {
       if (tagId == 0) {
           NSLog(@"User does not want to continue.");
       }
    }
}

现在，nextLevelAlert将委托设置为self，并且我在视图控制器的类中声明了委托。此外，当我执行showInView ... for nextLevelAlert时，它会出现，它正在识别正在按下的按钮。

Answer 1

我的猜测是你的param不是NSInteger而是按钮，你应该像这样更改buttonTouchedWithIdentifier：

- (void) buttonTouchedWithIdentifier:(id)sender
{
    UIButton *button = (UIButton*)sender;
    NSLog(@"buttonTouchedWithIdentifier %@",@(button.tag));
    if (button.tag == 0) {
        [self.delegate alert:self didClickButtonWithTagIdentifier:0];
    }
    if (button.tag == 1) {
        [self.delegate alert:self didClickButtonWithTagIdentifier:1];
    }
}

同样，在比较两个对象时，请使用isEqual:代替==

- (void)alert:(ARAlert *)alert didClickButtonWithTagIdentifier:(NSInteger)tagId
{
    if ([alert isEqual:nextLevelAlert]) {
       if (tagId == 0) {
           NSLog(@"User does not want to continue.");
       }
    }
 }

如何让自定义委托工作

1 个答案: