写了一个extension，如下：
extension UIScrollView{
///在ScrollView上的某个点放大
func zoomWithPoint(var zoomPoint:CGPoint,toScale:CGFloat,animated:Bool){
var contentSize:CGSize = CGSize.zeroSize
contentSize.width = self.contentSize.width / self.zoomScale
contentSize.height = self.contentSize.height / self.zoomScale
zoomPoint.x = (zoomPoint.x / self.bounds.size.width) * contentSize.width
zoomPoint.y = (zoomPoint.y / self.bounds.size.height) * contentSize.height
var zoomSize:CGSize = CGSize.zeroSize
zoomSize.width = self.bounds.size.width / toScale
zoomSize.height = self.bounds.size.height / toScale
var zoomRect:CGRect = CGRect.zeroRect
zoomRect.origin.x = zoomPoint.x - zoomSize.width / 2.0
zoomRect.origin.y = zoomPoint.y - zoomSize.height / 2.0
zoomRect.size.width = zoomSize.width
zoomRect.size.height = zoomSize.height
self.zoomToRect(zoomRect, animated: animated)
}
}
Original: https://www.cnblogs.com/Free-Thinker/p/15800823.html
Author: brave-sailor
Title: UIScrollView 在手指点击的坐标处放大
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