编辑代码

//用户交互
imageView.isUserInteractionEnabled = true
let tap = UITapGestureRecognizer(target: self, action: #selector (tapAction(tap:)))
imageView.addGestureRecognizer(tap)
//UIImageView触摸后,需要调用的事件方法
func tapAction(tap :UITapGestureRecognizer)
let scale :CGFloat = 1.2
var frame = tap.view!.frame
frame = CGRect(x:frame.origin.x, y:frame.origin.y, width:frame.size.width★scale, height:frame.size.height ★ scale)
tap.view!.frame = frame
}