swift - 在viewController中的2个不同的imageview上使用2个不同的UIPanGestureRecongizer

我下面的代码初始化2个不同的imageviews pg和tim。我为UIPanGestureRecognizer创建了一个单独的var，可用于每个imageview，并使用UIPanGestureRecongizer将func左右移动。现在，我无法移动图像视图。当我单击pg时，它会崩溃。我只想开发一个功能，使我可以自由移动每个图像视图。我所有的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)


}
}

最佳答案

尝试将constraints赋予两个frame，而不是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，


根据您的要求更改frame。
从viewDidLoad()删除应用constraints的代码。

关于swift - 在viewController中的2个不同的imageview上使用2个不同的UIPanGestureRecongizer，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/58796200/