ios - 具有单个 Segue 的多个按钮

Question

我有四个按钮和一个 segue。当这些按钮中的任何一个在事件中被触及时，它将在目标 View Controller 上加载相应的图像。为此，我通过它们的标记属性 [每个按钮 (0,1,2,3)] 来识别按钮。这是我的代码:

- (IBAction)Session1Btn:(id)sender {
    [self performSegueWithIdentifier:@"isSection" sender:self];
}

- (IBAction)Session2Btn:(id)sender {
       [self performSegueWithIdentifier:@"isSection" sender:self];
}

- (IBAction)Session3Btn:(id)sender {
       [self performSegueWithIdentifier:@"isSection" sender:self];
}

- (IBAction)Session4Btn:(id)sender {
       [self performSegueWithIdentifier:@"isSection" sender:self];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    SectionViewController *sVC=[segue destinationViewController];
    if([segue.identifier isEqualToString:@"isSection"])
    {
       // the following line gives an error!
        NSInteger tagIndex = [(UIButton *)sender tag];

       [sVC setSelectedButton:[NSNumber numberWithInteger:tagIndex]];

    }
}

但是我收到以下错误:

Answer 1

您必须像这样编写 UIButton UITouchUpInside 事件:

- (IBAction)buttonPressed:(id)sender
{
    [self performSegueWithIdentifier:@"isSection" sender:sender];
}

所有按钮的方式相同。

现在在.h 文件 中添加一个变量UIButton *selectedButton。并更新您的按钮事件方法，如下所示:

- (IBAction)buttonPressed:(id)sender
{
    selectedButton = (UIButton *)sender;
    [self performSegueWithIdentifier:@"isSection" sender:sender];
}

现在您有了 selectedButton 引用，可以在其他方法中使用它。这样，

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(UIButton *)sender {

    SectionViewController *sVC=[segue destinationViewController];
    if([segue.identifier isEqualToString:@"isSection"])
    {
       [sVC setSelectedButton:[NSNumber numberWithInteger: selectedButton.tag]];

    }
}