Question

是否可以根据不同的条件在同一IBAction中显示不同按钮的不同警报？我在IBAction中有一些代码：

- (IBAction)btnRecommendationTapped:(id)sender {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Recommendation"
                                                      message: @"It seems that you are interested in the %d of this collection."
                                                     delegate: nil
                                            cancelButtonTitle: nil
                                            otherButtonTitles: @"Yes", @"No", nil];
[alert show];
}

我想通过确定按钮显示另一个警告“抱歉！我们无法提供任何建议”。当条件满足时，IBAction中的那个显示另一个。

Answer 1

-(IBAction)buttonClicked:(id)sender
   {
          if([sender tag]==0)
         {
           UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"button 1 clicked" delegate:self 
            cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
                [alert show];
         }
         else if ([sender tag]==1)
         {
          UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"button 2 clicked" delegate:self
           cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
                [alert show];
         }
         else if ([sender tag]==2)
         {
          UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"button 3 clicked" delegate:self
           cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
                [alert show];
         }
}

Answer 2

有几种不同的方法可以做到这一点。您可以使用if statement根据条件创建不同的UIAlertView。

选项1：

- (IBAction)btnClicked:(id)sender
{
    UIAlertView *ourAlertView; // Create the local variable, we don't need to create multiple ones we can just set to the one.
    // This is your if statement to determine if your condition has been met
    // Whatever that condition is here we're going to assume you have set a BOOL
    // flag before hand called failed.
    if(!failed) {
        ourAlertView = [[UIAlertView alloc] initWithTitle:@"Recommendations"
                                                  message:@"We recommend..."
                                                 delegate:self // Very important
                                        cancelButtonTitle:@"No"
                                        otherButtonTitles:@"Yes", nil];
        [ourAlertView setTag:0]; // Would recommend setting a tag to determine which one has been used in the delegate methods.
    } else { // else if() if you want more then 2
        ourAlertView = [[UIAlertView alloc] initWithTitle:@"Sorry"
                                                  message:@"We're sorry..."
                                                 delegate:self // Very important
                                        cancelButtonTitle:@"OK"
                                        otherButtonTitles:nil];
        [ourAlertView setTag:1];
    }

    [ourAlertView show];
}

第二个选项会更简单，但我们会执行以下操作，仍使用if statement，但我们只创建一个UIAlertView

选项2：

- (IBAction)btnClicked:(id)sender
{
     // We create an empty `UIAlertView` only setting the delegate to self.
     UIAlertView *ourAlertView = [[UIAlertView alloc] initWithTitle:nil
                                               message:nil
                                              delegate:self // Very important
                                     cancelButtonTitle:nil
                                     otherButtonTitles:nil];

     if(!failed) {
        [ourAlertView setTitle:@"Recommendations"];
        [ourAlertView setMessage:@"We recommend..."];
        [ourAlertView addButtonWithTitle:@"No"];
        [ourAlertView addButtonWithTitle:@"Yes"];
        [ourAlertView setCancelButtonIndex:0];
        [ourAlertView setTag:0];
     } else {
        [ourAlertView setTitle:@"Sorry"];
        [ourAlertView setMessage:@"We're sorry..."];
        [ourAlertView addButtonWithTitle:@"OK"];
        [ourAlertView setCancelButtonIndex:0];
        [ourAlertView setTag:1];
     }

     [ourAlertView show];
}

但是，许多人忘记的最重要的事情（就是如果你希望它正常工作）是UIAlertViewDelegate。

因此，在.h文件中，您需要设置@interface

@interface MySubClass : MySuperClass <UIAlertViewDelegate>

这将允许您使用UIAlertViewDelegate

中的以下方法

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
- (void)alertViewCancel:(UIAlertView *)alertView
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)
- (void)didPresentAlertView:(UIAlertView *)alertView
- (void)willPresentAlertView:(UIAlertView *)alertView

结帐UIAlertView Apple Documentation和UIAlertViewDelegate Apple Documentation

非常重要关于您最常遵守的UIAlertView上Apple文档中的子类化的注意事项。

UIAlertView类旨在按原样使用，不支持子类化。此类的视图层次结构是私有的，不得修改

Answer 3

尝试如下：

- (IBAction)btnRecommendationTapped:(id)sender {
if(condition has fulfilled){
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Recommendation"
                                                      message: @"It seems that you are interested in the %d of this collection."
                                                     delegate: nil
                                            cancelButtonTitle: nil
                                            otherButtonTitles: @"Yes", @"No", nil];
[alert show];
}
else{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Sorry! we are unable to provide any recommendation"
                                                      message: nil"
                                                     delegate: nil
                                            cancelButtonTitle: nil
                                            otherButtonTitles: @"Ok", nil];
[alert show];

}
}

如何在一个IBAction中使用多个UIAlertView和不同的按钮？

3 个答案: