Мой быстрый код, как вы можете видеть на гифке ниже. Позволяет пользователю выбрать одно из представлений изображения, а затем использовать ползунок для увеличения или уменьшения размера этого представления изображения. Проблема в том, что когда изображение перемещается, другое изображение следует за ним, чего не должно происходить. Таким образом, ограничения должны быть установлены при первом запуске кода, но после выбора одного из представлений изображения. Ограничения, связывающие их вместе, должны быть деактивированы. Строка, вызывающая это:
** greenMove.leadingAnchor.constraint (equalTo: view.leadingAnchor, constant: 0), **
import UIKit
class ViewController: UIViewController {
var image1Width: NSLayoutConstraint!
var image1Height: NSLayoutConstraint!
var image1Width2: NSLayoutConstraint!
var image1Height2: NSLayoutConstraint!
var greenMove = UIImageView()
var slider = UISlider()
var blueMove = UIImageView()
var existingTransition : CGAffineTransform?
var clock = Int()
var currentView: UIView?
var g2 = UIPanGestureRecognizer()
var g3 = UIPanGestureRecognizer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
greenMove.isUserInteractionEnabled = true
blueMove.isUserInteractionEnabled = true
g2 = UIPanGestureRecognizer(target: self, action: #selector(ViewController.g1Method))
greenMove.addGestureRecognizer(g2)
g3 = UIPanGestureRecognizer(target: self, action: #selector(ViewController.g2Method))
blueMove.addGestureRecognizer(g3)
greenMove.backgroundColor = .systemGreen
blueMove.backgroundColor = .blue
[greenMove,slider,blueMove].forEach {
view.addSubview($0)
$0.translatesAutoresizingMaskIntoConstraints = false
}
//image11
image1Width = greenMove.widthAnchor.constraint(equalTo: view.widthAnchor ,multiplier: 0.2)
image1Height = greenMove.heightAnchor.constraint(equalTo: view.heightAnchor ,multiplier: 0.20)
//image12
image1Width2 = blueMove.widthAnchor.constraint(equalTo: view.widthAnchor ,multiplier: 0.2)
image1Height2 = blueMove.heightAnchor.constraint(equalTo: view.heightAnchor ,multiplier: 0.20)
NSLayoutConstraint.activate([
greenMove.topAnchor.constraint(equalTo: view.topAnchor, constant : 0),
image1Width,
image1Height,
greenMove.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant :0),
blueMove.topAnchor.constraint(equalTo: view.topAnchor, constant : 0),
image1Width2,
image1Height2,
blueMove.leadingAnchor.constraint(equalTo: greenMove.trailingAnchor, constant :0)
])
slider.addTarget(self, action: #selector(hhh), for: .allEvents)
}
override func viewDidLayoutSubviews() {
NSLayoutConstraint.activate ([
slider.topAnchor.constraint(equalTo: view.topAnchor, constant : greenMove.bounds.height),
slider.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.20, constant: 0),
slider.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.20, constant: 0),
slider.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant : 0),
])
}
@objc func handleTapGestured(_ gesture: UIPanGestureRecognizer) {
currentView = gesture.view
}
@objc func g1Method(_ sender: UIPanGestureRecognizer){
clock = 1
let subview = greenMove
guard let child = sender.view else{return}
let transitionPoint = sender.translation(in: self.view)
let newTransition = CGAffineTransform(translationX: transitionPoint.x, y: transitionPoint.y)
switch sender.state {
case .ended,.cancelled:// on End
if let existing = existingTransition{
self.existingTransition = newTransition.concatenating(existing)
}else{
self.existingTransition = newTransition
}
default://on change and other states
if let existing = existingTransition{
child.transform = newTransition
.concatenating(existing)
}else{
child.transform = newTransition
}
}
self.view.layoutIfNeeded()
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTapGestured(_:)))
subview.addGestureRecognizer(tapGesture)
}
@objc func g2Method(_ sender: UIPanGestureRecognizer){
clock = 2
let subview = blueMove
guard let child = sender.view else{return}
let transitionPoint = sender.translation(in: self.view)
let newTransition = CGAffineTransform(translationX: transitionPoint.x, y: transitionPoint.y)
switch sender.state {
case .ended,.cancelled:// on End
if let existing = existingTransition{
self.existingTransition = newTransition.concatenating(existing)
}else{
self.existingTransition = newTransition
}
default://on change and other states
if let existing = existingTransition{
child.transform = newTransition
.concatenating(existing)
}else{
child.transform = newTransition
}
}
self.view.layoutIfNeeded()
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTapGestured(_:)))
subview.addGestureRecognizer(tapGesture)
}
@objc func hhh() {
if clock == 1 {
image1Width.constant = CGFloat(slider.value) * view.frame.size.width * 0.25
image1Height.constant = CGFloat(slider.value) * view.frame.size.height * 0.25
}
if clock == 2 {
image1Width2.constant = CGFloat(slider.value) * view.frame.size.width * 0.25
image1Height2.constant = CGFloat(slider.value) * view.frame.size.height * 0.25
}
}
}