首页 > 解决方案 > 在 viewController 中的 2 个不同的图像视图上使用 2 个不同的 UIPanGestureRecongizer

问题描述

我下面的代码初始化了 2 个不同的图像视图 pg 和 tim。我为 UIPanGestureRecognizer 创建了一个单独的 var,用于每个 imageview 和 func 以使用 UIPanGestureRecongizer 移动 imageview。现在我无法移动图像视图。当我单击 pg 时,它会消失。我只想开发一个功能,让我可以自由移动每个图像视图。我的所有代码都是以编程方式编写的,因此您只需复制代码即可。

import UIKit

class ViewController: UIViewController {

var pg = UIImageView()
var pgGesture = UIPanGestureRecognizer()
var pgCon = [NSLayoutConstraint]()

var tim = UIImageView()
var timGesture = UIPanGestureRecognizer()
var timCon = [NSLayoutConstraint]()



override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.



    [pg,tim].forEach({
        $0.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview($0)
        $0.backgroundColor = UIColor.systemPink
        $0.isUserInteractionEnabled = true
    })


    pgGesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.pgGestureMethod(_:)))
    pg.addGestureRecognizer(pgGesture)


    timGesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.timGestureMethod(_:)))
    tim.addGestureRecognizer(timGesture)









    pgCon = [

        pg.trailingAnchor.constraint(equalTo: view.centerXAnchor, constant :37.5),
        pg.topAnchor.constraint(equalTo: view.centerYAnchor, constant : 225),
        pg.widthAnchor.constraint(equalToConstant: 75),
        pg.heightAnchor.constraint(equalToConstant: 50),
    ]


    NSLayoutConstraint.activate(pgCon)

    timCon = [

        tim.trailingAnchor.constraint(equalTo: view.centerXAnchor, constant :120),
        tim.topAnchor.constraint(equalTo: view.centerYAnchor, constant : 225),
        tim.widthAnchor.constraint(equalToConstant: 75),
        tim.heightAnchor.constraint(equalToConstant: 50),
    ]


    NSLayoutConstraint.activate(timCon)






}

@objc func pgGestureMethod(_ sender: UIPanGestureRecognizer){
    NSLayoutConstraint.deactivate(pgCon)
    NSLayoutConstraint.deactivate(timCon)
    self.view.bringSubviewToFront(pg)
    let tranistioon = sender.translation(in: self.view)
    pg.center = CGPoint(x: pg.center.x + tranistioon.x, y: pg.center.y + tranistioon.y)
    sender.setTranslation(CGPoint.zero,in: self.view)


}
@objc func timGestureMethod(_ sender: UIPanGestureRecognizer){
    NSLayoutConstraint.deactivate(timCon)
    NSLayoutConstraint.deactivate(pgCon)
    self.view.bringSubviewToFront(tim)
    let tranistioon = sender.translation(in: self.view)
    tim.center = CGPoint(x: tim.center.x + tranistioon.x, y: tim.center.y + tranistioon.y)
    sender.setTranslation(CGPoint.zero,in: self.view)


}
}

标签: swifttagsimageviewuipangesturerecognizercgpoint

解决方案


而不是constraints,尝试给frame两者imageViews,即

override func viewDidLoad() {
    super.viewDidLoad()

    pg.frame = CGRect(x: 100, y: 100, width: 75, height: 50) //here....
    tim.frame = CGRect(x: 200, y: 200, width: 75, height: 50) //here....

    //rest of the code...
}

在上面的代码中,

  1. frame根据您的要求更改。
  2. viewDidLoad()删除申请代码constraints

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