image
1、生成一个红包layer
//创建画布
let redPLayer = CALayer()
redPLayer.bounds = CGRectMake(0, 0, 35, 46);
redPLayer.anchorPoint = CGPointMake(0, 0)
redPLayer.position = CGPointMake(0, -46)
redPLayer.contents = UIImage(named: hbArr[Int(arc4random()%3)])!.CGImage
self.bgView.layer.addSublayer(redPLayer)
2、添加layer的动画
//画布动画
//此处keyPath为CALayer的属性
let moveAnimation:CAKeyframeAnimation = CAKeyframeAnimation(keyPath:"position")
//动画路线，一个数组里有多个轨迹点
let screenW = UInt32(CGRectGetWidth(UIScreen.mainScreen().bounds))
let screenH = CGRectGetHeight(UIScreen.mainScreen().bounds)
moveAnimation.values = [NSValue(CGPoint: CGPointMake(CGFloat(Float(arc4random_uniform(screenW))), 0)),NSValue(CGPoint: CGPointMake(CGFloat(Float(arc4random_uniform(screenW))), screenH))]
//动画间隔
moveAnimation.duration = 5
//重复次数
moveAnimation.repeatCount = 1
//动画的速度
moveAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
redPLayer.addAnimation(moveAnimation, forKey: "move")
3、定时生成红包
public func start() {
self.timer?.invalidate()
self.timer = nil
self.timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: #selector(self.showRain), userInfo: "", repeats: true)
}
4、判断红包点击事件
@objc private func clickRedPacket(tapgesture:UITapGestureRecognizer) -> Void {
let touchPoint = tapgesture.locationInView(self.bgView)
if let sublayers = self.bgView.layer.sublayers {
for e in sublayers.enumerate() {
if (e.element.presentationLayer()?.hitTest(touchPoint) != nil) {
print("点中了第\(e.index)个元素")
let num = randomNums[Int(arc4random()%3)]
if e.index != 0 && e.index % num == 0 {//不等于0切能被整除
self.stop()
if delegate != nil {
delegate?.clickRedPacket(e.index)
}
}
break
}
}
}
}
5、停止红包雨
public func stop() {
self.timer?.invalidate()
//删除当前红包layers
if let sublayers = self.bgView.layer.sublayers {
for item in sublayers {
item.removeAllAnimations()
item.removeFromSuperlayer()
}
}
self.dismiss()
}
