我有一段代码，点击屏幕左侧或右侧时，可以前后滚动全屏图像。当图像出现在屏幕上时，它会执行以下动画类型之一：上、下、左、右、放大、缩小——每个动画都包含两个子动画（第一个动画是快速动画，第二个动画是循环动画）。
问题是，切换图像时，动画坐标有时会叠加。正常情况下，动画应该只影响 X、Y 或 Scale 中的一个。但就我的情况而言，图像有时会沿对角线（X + Y）移动，动画会超出图像边界，导致屏幕上出现黑色区域。这种情况不应该发生。我该如何解决这个问题？
我removeAllAnimations在每个动画之前都使用它，但没有帮助。
完整代码：
class ReaderController: UIViewController, CAAnimationDelegate {
var pagesData = [PageData]()
var index = Int()
var pageIndex: Int = -1
let pageContainer: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let pageViews: [PageLayout] = {
let view = [PageLayout(), PageLayout()]
view[0].translatesAutoresizingMaskIntoConstraints = false
view[1].translatesAutoresizingMaskIntoConstraints = false
return view
}()
private weak var currentTransitionView: PageLayout?
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
setupConstraints()
pageViews[0].index = index
pageViews[1].index = index
pageViews[0].pageIndex = pageIndex
pageViews[1].pageIndex = pageIndex
pageTransition(animated: false, direction: "fromRight")
}
func setupViews() {
pageContainer.addSubview(pageViews[0])
pageContainer.addSubview(pageViews[1])
view.addSubview(pageContainer)
}
func setupConstraints() {
pageContainer.topAnchor.constraint(equalTo: view.topAnchor, constant: 0.0).isActive = true
pageContainer.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0.0).isActive = true
pageContainer.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0.0).isActive = true
pageContainer.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0.0).isActive = true
pageViews[0].topAnchor.constraint(equalTo: pageContainer.topAnchor).isActive = true
pageViews[0].bottomAnchor.constraint(equalTo: pageContainer.bottomAnchor).isActive = true
pageViews[0].leadingAnchor.constraint(equalTo: pageContainer.leadingAnchor).isActive = true
pageViews[0].trailingAnchor.constraint(equalTo: pageContainer.trailingAnchor).isActive = true
pageViews[1].topAnchor.constraint(equalTo: pageContainer.topAnchor).isActive = true
pageViews[1].bottomAnchor.constraint(equalTo: pageContainer.bottomAnchor).isActive = true
pageViews[1].leadingAnchor.constraint(equalTo: pageContainer.leadingAnchor).isActive = true
pageViews[1].trailingAnchor.constraint(equalTo: pageContainer.trailingAnchor).isActive = true
}
func loadData(fileName: Any) -> PagesData {
var url = NSURL()
url = Bundle.main.url(forResource: "text", withExtension: "json")! as NSURL
let data = try! Data(contentsOf: url as URL)
let person = try! JSONDecoder().decode(PagesData.self, from: data)
return person
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: view.self)
if view.safeAreaInsets.left > 30 {
if (location.x > self.view.frame.size.width - (view.safeAreaInsets.left * 1.5)) {
pageTransition(animated: true, direction: "fromRight")
} else if (location.x < (view.safeAreaInsets.left * 1.5)) {
pageTransition(animated: true, direction: "fromLeft")
}
}
else {
if (location.x > self.view.frame.size.width - 40) {
pageTransition(animated: true, direction: "fromRight")
} else if (location.x < 40) {
pageTransition(animated: true, direction: "fromLeft")
}
}
}
}
func pageTransition(animated: Bool, direction: String) {
let result = loadData(fileName: pagesData)
switch direction {
case "fromRight":
pageIndex += 1
case "fromLeft":
pageIndex -= 1
default: break
}
pageViews[0].pageIndex = pageIndex
pageViews[1].pageIndex = pageIndex
guard pageIndex >= 0 && pageIndex < result.pagesData.count else {
pageIndex = max(0, min(pageIndex, result.pagesData.count - 1))
return
}
let fromView = pageViews[0].isHidden ? pageViews[1] : pageViews[0]
let toView = pageViews[0].isHidden ? pageViews[0] : pageViews[1]
toView.imageView.layer.removeAllAnimations()
toView.imageView.transform = .identity
toView.configure(theData: result.pagesData[pageIndex])
if animated {
fromView.isHidden = true
toView.isHidden = false
} else {
fromView.isHidden = true
toView.isHidden = false
}
}
}
class PageLayout: UIView {
var index = Int()
var pageIndex = Int()
let imageView: UIImageView = {
let image = UIImageView()
image.contentMode = .scaleAspectFill
image.translatesAutoresizingMaskIntoConstraints = false
return image
}()
var imageViewTopConstraint = NSLayoutConstraint()
var imageViewBottomConstraint = NSLayoutConstraint()
var imageViewLeadingConstraint = NSLayoutConstraint()
var imageViewTrailingConstraint = NSLayoutConstraint()
var imagePosition = ""
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(imageView)
setupConstraints()
}
func setupConstraints() {
imageView.layer.removeAllAnimations()
imageView.transform = .identity
removeConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint,
imageViewTrailingConstraint])
switch imagePosition {
case "top":
imageView.transform = .identity
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: -40.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(translationX: 0, y: 40.0)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = self.imageView.transform.translatedBy(x: 0, y: -40.0)
}, completion: nil)
})
case "bottom":
imageView.transform = .identity
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 40.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(translationX: 0, y: -40)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = self.imageView.transform.translatedBy(x: 0, y: 40)
}, completion: nil)
})
case "left":
imageView.transform = .identity
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: -40.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(translationX: 40, y: 0)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = self.imageView.transform.translatedBy(x: -40, y: 0)
}, completion: nil)
})
case "right":
imageView.transform = .identity
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 40.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(translationX: -40, y: 0)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = self.imageView.transform.translatedBy(x: 40, y: 0)
}, completion: nil)
})
case "zoomin":
imageView.transform = CGAffineTransformScale(.identity, 1.0, 1.0)
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(scaleX: 1.1, y: 1.1)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = .identity
}, completion: nil)
})
case "zoomout":
imageView.transform = CGAffineTransformScale(.identity, 1.1, 1.1)
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
UIView.animate(withDuration: 2.0, delay: 0, options: [.curveEaseOut, .allowUserInteraction, .beginFromCurrentState], animations: {
self.imageView.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
}, completion: { _ in
UIView.animate(withDuration: 6.0, delay: 0, options: [.curveLinear, .autoreverse, .repeat, .beginFromCurrentState, .allowUserInteraction], animations: {
self.imageView.transform = self.imageView.transform.scaledBy(x: 1.1, y: 1.1)
}, completion: nil)
})
default:
imageView.transform = .identity
imageViewTopConstraint = imageView.topAnchor.constraint(equalTo: topAnchor, constant: 0.0)
imageViewBottomConstraint = imageView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: 0.0)
imageViewLeadingConstraint = imageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0.0)
imageViewTrailingConstraint = imageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 0.0)
addConstraints([imageViewTopConstraint, imageViewBottomConstraint, imageViewLeadingConstraint, imageViewTrailingConstraint])
}
}
func configure(theData: PageData) {
imageView.image = UIImage(named: "page\(pageIndex+1)")
imagePosition = theData.imagePosition
setupConstraints()
}
required init?(coder: NSCoder) {
fatalError("Not happening")
}
}
struct PagesData: Decodable {
var pagesData: [PageData]
}
struct PageData: Decodable {
let textData, textPosition, textColor, shadowColor, textAlignment, imagePosition: String
}
JSON：
{
"pagesData" : [
{
"textData" : "",
"textPosition" : "topLeft",
"textColor" : "FFFFFF",
"shadowColor" : "000000",
"textAlignment" : "left",
"imagePosition" : "left",
},
{
"textData" : "",
"textPosition" : "bottomLeft",
"textColor" : "FFFFFF",
"shadowColor" : "000000",
"textAlignment" : "left",
"imagePosition" : "bottom",
},
{
"textData" : "",
"textPosition" : "zoomin",
"textColor" : "FFFFFF",
"shadowColor" : "000000",
"textAlignment" : "left",
"imagePosition" : "right",
},
{
"textData" : "",
"textPosition" : "bottomCenter",
"textColor" : "FFFFFF",
"shadowColor" : "000000",
"textAlignment" : "left",
"imagePosition" : "zoomout",
},
{
"textData" : "",
"textPosition" : "topLeft",
"textColor" : "FFFFFF",
"shadowColor" : "000000",
"textAlignment" : "left",
"imagePosition" : "left",
},
]
}