我下面的快速代码正在使用nslayout约束来加载视图。我试图将uipangestureRecognizer放在imageview上。要使图像视图在uiview控制器周围移动。现在,如果我触摸图像视图,则什么也不会发生。我了解我已将永久约束置于负载范围内。我只是不知道如何让imageview移动。我要移动的图像视图是Fight [0]。
import UIKit
class ViewController: UIViewController {
var pic = UIImageView()
var draw = UIView()
let fight = (0..<10).map { _ in UIImageView() }
var g2 = UIPanGestureRecognizer()
override func viewDidLoad() {
super.viewDidLoad()
fight[0].image = UIImage(named: "a.png")
g2 = UIPanGestureRecognizer(target: self, action: #selector(ViewController.g1Method))
fight[0].addGestureRecognizer(g2)
fight.forEach{
$0.backgroundColor = .clear
view.addSubview($0)
$0.translatesAutoresizingMaskIntoConstraints = false
}
[pic,draw].forEach{
$0.backgroundColor = .red
view.addSubview($0)
$0.translatesAutoresizingMaskIntoConstraints = false
}
// Do any additional setup after loading the view.
NSLayoutConstraint.activate ([
fight[0].trailingAnchor.constraint(equalTo: view.trailingAnchor, constant :0),
fight[0].topAnchor.constraint(equalTo: view.topAnchor, constant : 50),
fight[0].heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.10, constant: 0),
fight[0].widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.10, constant: 0),
fight[0].leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),
])
}
@objc func g1Method(_ sender: UIPanGestureRecognizer){
self.view.bringSubviewToFront(sender.view!)
let tranistioon = sender.translation(in: self.view)
sender.view!.center = CGPoint(x: sender.view!.center.x + tranistioon.x, y: sender.view!.center.y + tranistioon.y)
sender.setTranslation(CGPoint.zero,in: self.view) }
}
默认情况下,UIImageView
做not已启用用户交互。
将此行添加到viewDidLoad()
中:
fight[0].isUserInteractionEnabled = true
您现在应该可以在周围拖动该图像视图。