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内部触摸时，它将在目标视图控制器上加载相应的图像。为此，我通过标签属性[每个按钮（0,1,2,3）]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

您必须这样写 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selectedButton引用，可以在其他方法中使用。那就是，

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

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

    }
}

Answer 2

夫特

为所选按钮创建属性： var selectedButton: Int = Int()

在每次IBAction中，将selectedButton分配给1或2并添加performSegue(withIdentifier: "yourSegueIdentifier", sender: self)。

在准备segue时添加以下内容：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if buttonTapped == 1 {
            // what ever happens when first button selected
        } else if buttonTapped == 2 {
            // what ever happens when second button selected
        }
    }