所以我的视图控制器中有两个按钮（附有图像）。单击其中任何一个时，会出现该图像的居中弹出窗口。
问题是，第一个按钮的图像在使用后没有重置其缩放比例和位置（第二个按钮）。因此，当您第二次单击图像时，它仍然会放大并且未对齐。
以下是缩放功能的代码：
//popup window
@IBOutlet var imageView1: UIView!
@IBOutlet var imageView2: UIView!
//scroll view
@IBOutlet weak var scrollView1: UIScrollView!
@IBOutlet weak var scrollView2: UIScrollView!
//image
@IBOutlet weak var zoomImageView1: UIImageView!
@IBOutlet weak var zoomImageView2: UIImageView!
//background is dimmed when the popup window is active
@IBOutlet weak var backgroundButton: UIButton!
var button1Pressed = false
var button2Pressed = false
override func viewDidLoad() {
super.viewDidLoad()
self.scrollView1.minimumZoomScale = 1.0
self.scrollView1.maximumZoomScale = 6.0
self.scrollView2.minimumZoomScale = 1.0
self.scrollView2.maximumZoomScale = 6.0
}
//this might be the problem code, not sure how to fix it though
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
if button1Pressed == true {
return self.zoomImageView1
} else {
return self.zoomImageView2
}
}
//resizes zoomed image when orientation changes
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
if UIDevice.current.orientation.isLandscape{
imageView1.center = self.view.center
imageView2.center = self.view.center
imageView1.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
imageView2.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
scrollView1.zoomScale = 1.0
scrollView2.zoomScale = 1.0
} else if UIDevice.current.orientation.isPortrait{
imageView1.center = self.view.center
imageView2.center = self.view.center
imageView1.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
imageView2.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
scrollView1.zoomScale = 1.0
scrollView2.zoomScale = 1.0
}
}
//activates the 1st image
@IBAction func showImageView1(_ sender: Any) {
animateIn1()
button1Pressed = true
}
//activates the 2nd image
@IBAction func showImageView2(_ sender: Any) {
animateIn2()
button2Pressed = true
}
//closes either image
@IBAction func closeImageView(_ sender: Any) {
animateOut()
button1Pressed = false
button2Pressed = false
}
func animateIn1() {
self.scrollView1.zoomScale = 1.0
self.view.addSubview(imageView1)
imageView1.center = self.view.center
imageView1.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
imageView1.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
imageView1.alpha = 0
self.backgroundButton.alpha = 0.7
UIView.animate(withDuration: 0.4) {
self.imageView1.alpha = 1
self.imageView1.transform = CGAffineTransform.identity
}
}
func animateIn2() {
self.scrollView2.zoomScale = 1.0
self.view.addSubview(imageView2)
imageView2.center = self.view.center
imageView2.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
imageView2.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
imageView2.alpha = 0
self.backgroundButton.alpha = 0.7
UIView.animate(withDuration: 0.4) {
self.imageView2.alpha = 1
self.imageView2.transform = CGAffineTransform.identity
}
}
func animateOut() {
if button1Pressed == true {
UIView.animate(withDuration: 0.3, animations: {
self.imageView1.transform = CGAffineTransform(scaleX: 1, y: 1)
self.imageView1.alpha = 0
self.backgroundButton.alpha = 0
}) { (success:Bool) in
self.imageView1.removeFromSuperview()
}
} else if button2Pressed == true {
UIView.animate(withDuration: 0.3, animations: {
self.imageView2.transform = CGAffineTransform(scaleX: 1, y: 1)
self.imageView2.alpha = 0
self.backgroundButton.alpha = 0
}) { (success:Bool) in
self.imageView2.removeFromSuperview()
}
}
}
这可能很简单。
非常感谢任何帮助。
答案 0 :(得分：1)
而不是检查button1Pressed == true，而应该检查哪个scrollview作为参数：
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
if scrollView == scrollView1 {
return self.zoomImageView1
} else {
return self.zoomImageView2
}
}