ios 在 Swift 中以编程方式将 UIGestureRecognizer 添加到子视图
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原文地址: http://stackoverflow.com/questions/35466926/
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Adding UIGestureRecognizer To Subview Programmatically in Swift
提问by Andrew Walz
I currently have a subview that is created and added to the UIViewin ViewDidLoad(). I am attempting to user UIGestureRecognizersto detect a tap and unhide a particular button. My current code:
我目前有一个创建并添加到UIViewin的子视图ViewDidLoad()。我试图让用户UIGestureRecognizers检测点击并取消隐藏特定按钮。我目前的代码：
override func viewDidLoad() {
super.viewDidLoad()
architectView = CustomClass(frame: self.view.bounds)
self.view.addSubview(architectView)
let gestureRecognizer = UITapGestureRecognizer(target: self, action: "handleTap:")
gestureRecognizer.delegate = self
architectView.addGestureRecognizer(gestureRecognizer)
}
func handleTap(gestureRecognizer: UIGestureRecognizer) {
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
The handleTap()function is a simple test to see if the taps are being recognized. This code does not trigger the UIAlertwhen it is pressed? What am I missing?
该handleTap()功能是一个简单的测试，以查看是否可以识别点击。此代码UIAlert在按下时不会触发？我错过了什么？
回答by Raphael Silva
I tested your code here and it does work. However, I think you might be missing to add the UIGestureRecognizerDelegateprotocol to your View Controller. See below:
我在这里测试了你的代码，它确实有效。但是，我认为您可能没有将UIGestureRecognizerDelegate协议添加到您的视图控制器中。见下文：
class ViewController: UIViewController, UIGestureRecognizerDelegate {
var architectView = UIView()
override func viewDidLoad() {
super.viewDidLoad()
architectView = UIView(frame: self.view.bounds)
self.view.addSubview(architectView)
let gestureRecognizer = UITapGestureRecognizer(target: self, action: "handleTap:")
gestureRecognizer.delegate = self
architectView.addGestureRecognizer(gestureRecognizer)
}
func handleTap(gestureRecognizer: UIGestureRecognizer) {
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
回答by mriaz0011
Swift 3 version code based on Raphael Silva answer:
基于 Raphael Silva 答案的 Swift 3 版本代码：
import UIKit
class ViewController: UIViewController, UIGestureRecognizerDelegate {
var architectView = UIView()
override func viewDidLoad() {
super.viewDidLoad()
architectView = UIView(frame: self.view.bounds)
self.view.addSubview(architectView)
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.handleTap(gestureRecognizer:)))
gestureRecognizer.delegate = self
architectView.addGestureRecognizer(gestureRecognizer)
}
func handleTap(gestureRecognizer: UIGestureRecognizer) {
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
