我希望有人可以帮助我。我试图允许用户将UIImageView缩放(允许使用最大和最小级别)。但是由于某种原因，它不正常。图像放大一点，然后弹回。谢谢。
这里是放大功能
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
}
}
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。
为了设置最大/最小缩放我使用：
scrollImg.minimumZoomScale = 1.0
scrollImg.maximumZoomScale = 10.0
这里是其余的代码。
var vWidth = self.view.frame.width
var vHeight = self.view.frame.height
var scrollImg: UIScrollView = UIScrollView()
scrollImg.delegate = self
scrollImg.frame = CGRectMake(0,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!)
我也不得不添加这一点
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return self.imageView
}
