ios - 如何让自定义委托(delegate)工作

Question

我正在创建自定义委托(delegate) UIAlertView 的 alert:buttonClickedAtIndex: 方法，但它无法正常工作。我正在对 UIView 进行子类化，并且我有两个标记为 0 和 1 的按钮。当我去检查我的自定义 View 的委托(delegate)时，这仍然不起作用。这是我做的代码。

自定义 View

- (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(delegate)设置为 self，并且我确实在 View Controller 的类中声明了委托(delegate)。此外，当我为 nextLevelAlert 执行 showInView... 时，它确实出现了，它正在识别正在按下的按钮。

Answer 1

我猜你的参数不是 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];
    }
}

另外，当比较两个对象时使用 isEqual: 而不是 ==

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