UIImageView捏缩放迅速
问题描述：
我希望有人能帮助我.我试图允许用户捏UIImageView(允许的最大和最小级别)上的缩放.但是由于某种原因，它无法正常工作.图像会稍微放大，然后反弹.谢谢.
I was hoping someone could help me out. I am trying to allow a user to pinch zoom on a UIImageView(with a max and min level allowed). But for some reason the it does not work right. The image zooms a little then just bounces back. Thank you.
这是变焦功能
func zoom(sender:UIPinchGestureRecognizer) {
if sender.state == .Ended || sender.state == .Changed {
let currentScale = self.view.frame.size.width / self.view.bounds.size.width
var newScale = currentScale*sender.scale
if newScale < 1 {
newScale = 1
}
if newScale > 9 {
newScale = 9
}
let transform = CGAffineTransformMakeScale(newScale, newScale)
self.imageView?.transform = transform
sender.scale = 1
}
}
答
我决定将imageView添加到UIScrollView.它允许用户缩放和平移.这是我使用的代码.
I decided to add the imageView to a UIScrollView. It allows the user to zoom and pan over. Here is the code I used.
为了设置我使用的最大/最小缩放:
in order to set max/min zoom I used :
scrollImg.minimumZoomScale = 1.0
scrollImg.maximumZoomScale = 10.0
这是其余的代码.
var vWidth = self.view.frame.width
var vHeight = self.view.frame.height
var scrollImg: UIScrollView = UIScrollView()
scrollImg.delegate = self
scrollImg.frame = CGRectMake(0, 0, vWidth!, vHeight!)
scrollImg.backgroundColor = UIColor(red: 90, green: 90, blue: 90, alpha: 0.90)
scrollImg.alwaysBounceVertical = false
scrollImg.alwaysBounceHorizontal = false
scrollImg.showsVerticalScrollIndicator = true
scrollImg.flashScrollIndicators()
scrollImg.minimumZoomScale = 1.0
scrollImg.maximumZoomScale = 10.0
defaultView!.addSubview(scrollImg)
imageView!.layer.cornerRadius = 11.0
imageView!.clipsToBounds = false
scrollImg.addSubview(imageView!)
我也必须添加它
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return self.imageView
}
Swift 3&以上功能原型
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return self.mainImage
}