Swift以编程方式向按钮添加show动作

Question

如何以编程方式向按钮添加操作。我需要在mapView中为按钮添加show动作。感谢

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Answer 1

您可以使用以下代码
    `

let btn: UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
btn.backgroundColor = UIColor.green
btn.setTitle("Click Me", for: .normal)
btn.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
btn.tag = 1
self.view.addSubview(btn) 

采取行动

 @objc func buttonAction(sender: UIButton!) {
        let btnsendtag: UIButton = sender
        if btnsendtag.tag == 1 {

            dismiss(animated: true, completion: nil)
        }
    }

Answer 2

  let button = UIButton(type: UIButtonType.Custom) as UIButton
  button.addTarget(self, action: "action:", forControlEvents: UIControlEvents.TouchUpInside)

  //then make a action method :

  func action(sender:UIButton!) {
     print("Button Clicked")
  }

Answer 3

这适用于Objective-C

  

您可以创建这样的按钮

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchDragInside];
[button setTitle:@"Test Headline Text" forState:UIControlStateNormal];
button.frame = CGRectMake(20, 100, 100, 40);
[self.view addSubview:button];

  

自定义操作

 -(void)buttonAction {
       NSLog(@"Press Button");
 }

这适用于最新的Swift

  

请您创建这样的按钮

let button = UIButton()
button.frame = CGRect(x: self.view.frame.size.width - 20, y: 20, width: 100, height: 100)
button.backgroundColor = UIColor.gray
button.setTitle("ButtonNameAreHere", for: .normal)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
self.view.addSubview(button)

  

自定义操作

func buttonAction(sender: UIButton!) {
    print("Button tapped")
}

Answer 4

你需要像穆罕默德建议的那样为按钮添加一个目标

button.addTarget(self, action: "action:", forControlEvents: UIControlEvents.TouchUpInside)

但你也需要一种方法来实现这一行动

func action(sender: UIButton) {
    // Do whatever you need when the button is pressed
}

Answer 5

除上述内容外，新的ios14引入了

 if #available(iOS 14.0, *) {
     button.addAction(UIAction(title: "Click Me", handler: { _ in
                    print("Hi")
                }), for: .touchUpInside)           
 } else {
     // Fallback on earlier versions
 }

Answer 6

对于Swift 4，请使用以下内容：

button.addTarget(self, action: #selector(AwesomeController.coolFunc(_:)), for: .touchUpInside)

//later in your AswesomeController
@IBAction func coolFunc(_ sender:UIButton!) {
  // do cool stuff here
}

Answer 7

override func viewDidLoad() {
    super.viewDidLoad()  

    let btn = UIButton()
    btn.frame = CGRectMake(10, 10, 50, 50) 
    btn.setTitle("btn", forState: .Normal) 
    btn.setTitleColor(UIColor.redColor(), forState: .Normal) 
    btn.backgroundColor = UIColor.greenColor() 
    btn.tag = 1
    btn.addTarget(self, action: "btnclicked:", forControlEvents: .TouchUpInside)  //add button action
    self.view.addSubview(btn)
}