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blog.csdn.net/hello_hwc
有些View经过Mask处理后,占用的区域应当比frame要小,这时候Gesture的响应区域也应该限制在Mask后的区域。
例如
简单来说,就是使用了一个代理函数来判断是否receive touch
class ViewController: UIViewController,UIGestureRecognizerDelegate {
@IBOutlet weak var imageview: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.imageview.userInteractionEnabled = true
self.imageview.layer.cornerRadius = 100
self.imageview.layer.masksToBounds = true
let tapGesture = UITapGestureRecognizer(target: self,action: "tap:")
tapGesture.delegate = self //Should set delegate to self
self.imageview.addGestureRecognizer(tapGesture)
}
func tap(sender:UITapGestureRecognizer){
println("Got tap")
}
//THis is key
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer,shouldReceivetouch touch: UITouch) -> Bool {
let touchPoint = touch.locationInView(self.imageview)
if CGRectContainsPoint(self.imageview.bounds,touchPoint){
let centerX = CGRectGetMidX(self.imageview.bounds)
let centerY = CGRectGetMidY(self.imageview.bounds)
let xy2 = pow(centerX - touchPoint.x,2.0) + pow(centerY - touchPoint.y,2.0)
let radius2 = pow(CGRectGetWidth(self.imageview.frame)/2,2)
if xy2 < radius2{
return true
}
}
return false
}
}
原文地址:https://www.jb51.cc/swift/327155.html
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