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我有一個ScrollView內的ImageView。我可以放大。但是，每當我釋放光標，整個圖像就會適合屏幕。我只想顯示圖像的縮放部分。這是我的代碼。Swift中縮放UIImageView裏面的滾動視圖
func centerScrollViewContents(){
let boundsSize = scrollView.bounds.size
var contentsFrame = imageView.frame
if contentsFrame.size.width < boundsSize.width{
contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width)/2
}else{
contentsFrame.origin.x = 0
}
if contentsFrame.size.height < boundsSize.height {
contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height)/2
}else{
contentsFrame.origin.y = 0
}
imageView.frame = contentsFrame
}
func scrollViewDidZoom(scrollView: UIScrollView) {
centerScrollViewContents()
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return imageView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(animated: Bool) {
scrollView.delegate = self
imageView.frame = CGRectMake(16, 16, scrollView.frame.size.width, scrollView.frame.size.height)
imageView.contentMode = UIViewContentMode.ScaleToFill
imageView.image = UIImage(named: imgstr)
var imagee = UIImage(named: imgstr)
let size = imagee?.size
//imageView.contentMode = UIViewContentMode.ScaleAspectFit
imageView.userInteractionEnabled = true
scrollView.addSubview(imageView)
scrollView.contentSize = size!
let scrollViewFrame = scrollView.frame
let scaleWidth = scrollViewFrame.size.width/scrollView.contentSize.width
let scaleHeight = scrollViewFrame.size.height/scrollView.contentSize.height
let minScale = min(scaleHeight, scaleWidth)
scrollView.minimumZoomScale = minScale
scrollView.maximumZoomScale = 1
scrollView.zoomScale = minScale
centerScrollViewContents()
}
我刪除centerScrollViewContents()，但我得到了相同的結果