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UI|iOS 粒子效果实现CAEmitterLayer

iOS 粒子效果实现CAEmitterLayer CAEmitterLayer是ios5中苹果引入了一个新的CALayer子类。CAEmitterLayer是一个高性能的粒子引擎，可以用来做一些绚丽的粒子系统，比如爆炸，雪花火焰等等。
【UI|iOS 粒子效果实现CAEmitterLayer】来来直接上代码 简单的 主要效果是在self.view.layer上加了粒子效果，并且让这个粒子效果可以跟着按钮的拖动一起移动

// //ViewController.m //Emitter粒子效果 // //Created by 梅 on 2017/4/13. //Copyright ? 2017年 梅. All rights reserved. //#import "ViewController.h"@interface ViewController ()@property (nonatomic,strong)UIButton *button; @end@implementation ViewController{ CAEmitterLayer *_emitterLayer; //粒子发射器 }- (void)viewDidLoad { [super viewDidLoad]; self.button = [UIButton buttonWithType:UIButtonTypeCustom]; [self.button setFrame:CGRectMake(100, 100, 80, 80)]; self.button.layer.masksToBounds = YES; self.button.layer.cornerRadius = self.button.frame.size.width/2; self.button.backgroundColor = [UIColor cyanColor]; [self.button addTarget:self action:@selector(changeValue:) forControlEvents:UIControlEventTouchUpInside]; [self.button addTarget:self action:@selector(startChangeOpinsion:withEvent:) forControlEvents:UIControlEventTouchDragInside]; [self.button addTarget:self action:@selector(endChangeOpinsion:withEvent:) forControlEvents:UIControlEventTouchUpOutside]; [self.view addSubview:self.button]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor = [UIColor blackColor]; // 创建粒子Layer _emitterLayer = [CAEmitterLayer layer]; // 粒子发射位置 _emitterLayer.emitterPosition = CGPointMake(self.button.frame.origin.x+self.button.frame.size.width/2, self.button.frame.origin.y+self.button.frame.size.height/2); // 发射源的尺寸大小 _emitterLayer.emitterSize= self.button.frame.size ; // 发射模式 _emitterLayer.emitterMode= kCAEmitterLayerSurface; // 发射源的形状 _emitterLayer.emitterShape= kCAEmitterLayerCircle; // 创建雪花类型的粒子 CAEmitterCell *snowflake= [CAEmitterCell emitterCell]; // 粒子的名字 snowflake.name = @"snow"; // 粒子参数的速度乘数因子 snowflake.birthRate = 20.0; snowflake.lifetime= 120.0; // 粒子速度 snowflake.velocity= 100.0; // 粒子的速度范围 snowflake.velocityRange = 10; // 粒子y方向的加速度分量 snowflake.yAcceleration = 200; // 周围发射角度 snowflake.emissionRange = 0.5 * M_PI; // 子旋转角度范围 snowflake.spinRange = 0.25 * M_PI; snowflake.contents= (id)[[UIImage imageNamed:@"littleOrangeIcon"] CGImage]; // 设置雪花形状的粒子的颜色 snowflake.color= [[UIColor whiteColor] CGColor]; snowflake.redRange= 2.f; snowflake.greenRange = 2.f; snowflake.blueRange= 2.f; snowflake.scaleRange = 0.6f; snowflake.scale= 0.7f; _emitterLayer.shadowOpacity = 1.0; _emitterLayer.shadowRadius= 0.0; _emitterLayer.shadowOffset= CGSizeMake(0.0, 0.0); // 粒子边缘的颜色 _emitterLayer.shadowColor= [[UIColor whiteColor] CGColor]; // 添加粒子 _emitterLayer.emitterCells = @[snowflake]; // 将粒子Layer添加进图层中 [self.view.layer addSublayer:_emitterLayer]; }- (void)changeValue:(UIButton *)bu{NSLog(@"KISS ME"); }- (void)startChangeOpinsion:(UIControl *)c withEvent:ev{ c.center = [[[ev allTouches] anyObject] locationInView:self.view]; _emitterLayer.emitterPosition = CGPointMake(self.button.frame.origin.x+self.button.frame.size.width/2, self.button.frame.origin.y+self.button.frame.size.height/2); } - (void)endChangeOpinsion:(UIControl *)c withEvent:ev{ c.center = [[[ev allTouches] anyObject] locationInView:self.view]; _emitterLayer.emitterPosition = CGPointMake(self.button.frame.origin.x+self.button.frame.size.width/2, self.button.frame.origin.y+self.button.frame.size.height/2); }

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