IOS Swift uses closures to implement View click, long press events

Similar to Android set view click, long press listener

use

       let label = UILabel()
       label.text = "Test"
        
        self.view.backgroundColor = UIColor.green
        self.view.addSubview(label)
        label.snp.makeConstraints { (make) in
            make.top.equalToSuperview().offset(0)
            make.width.equalTo(200)
            make.height.equalTo(80)
        }
        label.backgroundColor = UIColor.red
        
        label.addOnClick { (view) in
            ToastUtil.show("click")
        }
        
        label.addOnLongPress { (view) in
            ToastUtil.show("long press")}Copy the code

Realize the principle of

Use swift extensions, associated properties, closures

import UIKit
import Foundation

extension UIView {
    // Click events
    typealias OnClickListener = (UIView) - >Void
    // Long press event
    typealias OnLongPressListener = (UIView) - >Void
    
    private struct AssociatedKeys {
        static var clickKey = "UIView.click"
        static var longPressKey = "UIView.onpress"
    }

    var clickListener: OnClickListener? {
        get {
            return objc_getAssociatedObject(self.&AssociatedKeys.clickKey) as? OnClickListener
        }
        set (listener) {
            objc_setAssociatedObject(self.&AssociatedKeys.clickKey, listener, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)}}var longPressListener: OnLongPressListener? {
        get {
            return objc_getAssociatedObject(self.&AssociatedKeys.longPressKey) as? OnLongPressListener
        }
        set (listener) {
            objc_setAssociatedObject(self.&AssociatedKeys.longPressKey, listener, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)}}func addOnClick(listener: OnClickListener?). -> Void {
        let tapGes = UITapGestureRecognizer(target: self, action: #selector(onClick))
        tapGes.numberOfTapsRequired = 1
        self.addGestureRecognizer(tapGes)
        self.isUserInteractionEnabled = true
        clickListener = listener
    }
    
    func addOnLongPress(listener: OnLongPressListener?). -> Void {
        let longPress = UILongPressGestureRecognizer(target: self, action: #selector(onLongPress))
        longPress.minimumPressDuration = 1
        self.addGestureRecognizer(longPress)
        self.isUserInteractionEnabled = true
        longPressListener = listener
    }
    
    @objc func onClick(sender: UITapGestureRecognizer) -> Void {
        if let listener = clickListener {
            listener(self)}}@objc func onLongPress(sender: UILongPressGestureRecognizer) -> Void {
        print(sender.state);
        if (sender.state = = UIGestureRecognizer.State.began) {
            if let listener = longPressListener {
                listener(self)}}}}Copy the code