iOS实现“下雨下雪”动画效果和“烟花”动画效果
【摘要】
“下雨”的动画效果
一、效果展示
二、实现流程
设置背景
func setupUI() {
self.imageView = UIImageView.init()
...
“下雨”的动画效果
一、效果展示
二、实现流程
- 设置背景
func setupUI() {
self.imageView = UIImageView.init()
self.imageView?.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)
self.imageView?.image = UIImage.init(named: "rain")
self.view.addSubview(self.imageView!)
self.view.sendSubviewToBack(self.imageView!)
}
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- 设置发射源
self.rainLayer = CAEmitterLayer.init()
self.imageView?.layer.addSublayer(self.rainLayer!)
// 发射形状:线性
self.rainLayer!.emitterShape = CAEmitterLayerEmitterShape.line
// 发射模式
self.rainLayer!.emitterMode = CAEmitterLayerEmitterMode.surface
// 发射源大小
self.rainLayer!.emitterSize = self.view.frame.size
// 发射源位置 y最好不要设置为0 最好<0
self.rainLayer!.emitterPosition = CGPoint.init(x: self.view.bounds.size.width * 0.5, y: -10)
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- 设置发射粒子
let snowCell = CAEmitterCell.init()
// 每秒产生的粒子数量的系数
snowCell.birthRate = 25.0
// 粒子内容
snowCell.contents = UIImage.init(named: "rain_white")?.cgImage
// 粒子的生命周期
snowCell.lifetime = 20.0
// speed粒子速度.图层的速率。用于将父时间缩放为本地时间，例如，如果速率是2，则本地时间的进度是父时间的两倍。默认值为1
snowCell.speed = 10.0
// 粒子速度系数, 默认1.0
snowCell.velocity = 10.0
// 每个发射物体的初始平均范围,默认等于0
snowCell.velocityRange = 10.0
// 粒子在y方向的加速的
snowCell.yAcceleration = 1000.0
// 粒子缩放比例: scale
snowCell.scale = 0.1
// 粒子缩放比例范围:scaleRange
snowCell.scaleRange = 0.0
self.rainLayer?.emitterCells = [snowCell]
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- 点击事件处理
// MARK: Events Responder
@IBAction func responderToRainBig(_ sender: UIButton) {
if self.rainLayer!.birthRate < 30 {
self.rainLayer?.setValue(self.rainLayer!.birthRate + 1, forKey: "birthRate")
self.rainLayer?.setValue(self.rainLayer!.scale + 0.05, forKey: "scale")
}
}
@IBAction func respondertToRainStop(_ sender: UIButton) {
sender.isSelected = !sender.isSelected
if sender.isSelected {
self.rainLayer?.setValue(0.0, forKey: "birthRate")
} else {
self.rainLayer?.setValue(1.0, forKey: "birthRate")
}
}
@IBAction func responderToRainSmall(_ sender: UIButton) {
if self.rainLayer!.birthRate > 1 {
self.rainLayer?.setValue(self.rainLayer!.birthRate - 1, forKey: "birthRate")
self.rainLayer?.setValue(self.rainLayer!.scale - 0.05, forKey: "scale")
}
}
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“烟花”的动画效果
一、效果展示
实现
self.view.backgroundColor = UIColor.black
// cell产生在底部,向上移动
let fireworkdEmitter = CAEmitterLayer.init()
fireworkdEmitter.emitterPosition = CGPoint.init(x: self.view.frame.size.width/2, y: self.view.frame.size.height)
fireworkdEmitter.emitterMode = CAEmitterLayerEmitterMode.outline
fireworkdEmitter.emitterShape = CAEmitterLayerEmitterShape.line
fireworkdEmitter.renderMode = CAEmitterLayerRenderMode.additive
fireworkdEmitter.seed = (arc4random()%100)+1
// 创建火箭cell
let rocket = CAEmitterCell.init()
rocket.birthRate = 1
rocket.emissionRange = CGFloat(0.25 * Double.pi);
rocket.velocity = 300
rocket.velocityRange = 75
rocket.lifetime = 1.02
rocket.contents = UIImage.init(named: "rain_white")?.cgImage
rocket.scale = 0.5
rocket.scaleRange = 0.5
rocket.color = UIColor.red.cgColor
rocket.greenRange = 1.0
rocket.redRange = 1.0
rocket.blueRange = 1.0
rocket.spinRange = CGFloat(Double.pi)
// 破裂对象不能被看到,但会产生火花
// 这里改变颜色,因为火花继承它的值
let fireCell = CAEmitterCell.init()
fireCell.birthRate = 1
fireCell.velocity = 0
fireCell.scale = 1
fireCell.redSpeed = -1.5
fireCell.blueSpeed = +1.5
fireCell.greenSpeed = +1.5
fireCell.lifetime = 0.34
// and finally, the sparks
let spark = CAEmitterCell.init()
// 炸开后产生400个小烟花
spark.birthRate = 400
// 速度
spark.velocity = 125
// 360度
spark.emissionRange = CGFloat(2 * Double.pi)
// 重力
spark.yAcceleration = 40
spark.lifetime = 3
spark.contents = UIImage.init(named: "rain_white")?.cgImage
spark.scaleSpeed = -0.2
spark.greenSpeed = -0.1
spark.redSpeed = +0.1
spark.blueSpeed = -0.1
spark.alphaSpeed = -0.25
spark.spin = CGFloat(2 * Double.pi)
spark.spinRange = CGFloat(2 * Double.pi)
fireworkdEmitter.emitterCells = [rocket]
rocket.emitterCells = [fireCell]
fireCell.emitterCells = [spark];
self.view.layer.addSublayer(fireworkdEmitter)
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完整示例
文章来源: blog.csdn.net，作者：Serendipity·y，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/Forever_wj/article/details/107886181
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