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  • 能产生粒子效果的CAEmitterLayer

    能产生粒子效果的CAEmitterLayer

    下雪效果:

    //
    //  RootViewController.m
    //  Cell
    //
    //  Copyright (c) 2014年 Y.X. All rights reserved.
    //
    
    #import "RootViewController.h"
    
    @interface RootViewController ()
    
    @end
    
    @implementation RootViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        self.view.backgroundColor  = [UIColor blackColor];
        
        // 创建粒子Layer
        CAEmitterLayer *snowEmitter = [CAEmitterLayer layer];
        
        // 粒子发射位置
        snowEmitter.emitterPosition = CGPointMake(120,20);
        
        // 发射源的尺寸大小
        snowEmitter.emitterSize = self.view.bounds.size;
        
        // 发射模式
        snowEmitter.emitterMode = kCAEmitterLayerSurface;
        
        // 发射源的形状
        snowEmitter.emitterShape = kCAEmitterLayerLine;
        
        // 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 = 1.0;
        snowflake.lifetime = 120.0;
        
        // 粒子速度
        snowflake.velocity =10.0;
        
        // 粒子的速度范围
        snowflake.velocityRange = 10;
        
        // 粒子y方向的加速度分量
        snowflake.yAcceleration = 2;
        
        // 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:@"snow"] CGImage];
        
        // 设置雪花形状的粒子的颜色
        snowflake.color = [[UIColor whiteColor] CGColor];
        
        snowflake.scaleRange = 0.6f;
        snowflake.scale = 0.7f;
        
        snowEmitter.shadowOpacity = 1.0;
        snowEmitter.shadowRadius = 0.0;
        snowEmitter.shadowOffset = CGSizeMake(0.0, 0.0);
        
        // 粒子边缘的颜色
        snowEmitter.shadowColor = [[UIColor whiteColor] CGColor];
        
        // 添加粒子
        snowEmitter.emitterCells = @[snowflake];
        
        // 将粒子Layer添加进图层中
        [self.view.layer addSublayer:snowEmitter];
    }
    
    @end

    烟花效果:

    //
    //  RootViewController.m
    //  Cell
    //
    //  Copyright (c) 2014年 Y.X. All rights reserved.
    //
    
    #import "RootViewController.h"
    
    @interface RootViewController ()
    
    @end
    
    @implementation RootViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        self.view.backgroundColor  = [UIColor blackColor];
        
        // Cells spawn in the bottom, moving up
        CAEmitterLayer *fireworksEmitter = [CAEmitterLayer layer];
        CGRect viewBounds = self.view.layer.bounds;
        fireworksEmitter.emitterPosition = 
            CGPointMake(viewBounds.size.width/2.0, viewBounds.size.height);
        
        fireworksEmitter.emitterSize    = CGSizeMake(viewBounds.size.width/2.0, 0.0);
        fireworksEmitter.emitterMode    = kCAEmitterLayerOutline;
        fireworksEmitter.emitterShape    = kCAEmitterLayerLine;
        fireworksEmitter.renderMode        = kCAEmitterLayerAdditive;
        fireworksEmitter.seed = (arc4random()%100)+1;
        
        // Create the rocket
        CAEmitterCell* rocket = [CAEmitterCell emitterCell];
        
        rocket.birthRate        = 1.0;
        rocket.emissionRange    = 0.25 * M_PI;  // some variation in angle
        rocket.velocity            = 380;
        rocket.velocityRange    = 100;
        rocket.yAcceleration    = 75;
        rocket.lifetime            = 1.02;    // we cannot set the birthrate < 1.0 for the burst
        
        rocket.contents            = (id) [[UIImage imageNamed:@"DazRing"] CGImage];
        rocket.scale            = 0.2;
        rocket.color            = [[UIColor redColor] CGColor];
        rocket.greenRange        = 1.0;        // different colors
        rocket.redRange            = 1.0;
        rocket.blueRange        = 1.0;
        rocket.spinRange        = M_PI;        // slow spin
        
        
        
        // the burst object cannot be seen, but will spawn the sparks
        // we change the color here, since the sparks inherit its value
        CAEmitterCell* burst = [CAEmitterCell emitterCell];
        
        burst.birthRate            = 1.0;        // at the end of travel
        burst.velocity            = 0;
        burst.scale                = 2.5;
        burst.redSpeed            =-1.5;        // shifting
        burst.blueSpeed            =+1.5;        // shifting
        burst.greenSpeed        =+1.0;        // shifting
        burst.lifetime            = 0.35;
        
        // and finally, the sparks
        CAEmitterCell* spark = [CAEmitterCell emitterCell];
        
        spark.birthRate            = 400;
        spark.velocity            = 125;
        spark.emissionRange        = 2* M_PI;    // 360 deg
        spark.yAcceleration        = 75;        // gravity
        spark.lifetime            = 3;
        
        spark.contents            = (id) [[UIImage imageNamed:@"snow"] CGImage];
        spark.scaleSpeed        =-0.2;
        spark.greenSpeed        =-0.1;
        spark.redSpeed            = 0.4;
        spark.blueSpeed            =-0.1;
        spark.alphaSpeed        =-0.25;
        spark.spin                = 2* M_PI;
        spark.spinRange            = 2* M_PI;
        
        // putting it together
        fireworksEmitter.emitterCells    = [NSArray arrayWithObject:rocket];
        rocket.emitterCells                = [NSArray arrayWithObject:burst];
        burst.emitterCells                = [NSArray arrayWithObject:spark];
        [self.view.layer addSublayer:fireworksEmitter];
    }
    
    @end

    /* The birth rate of each cell is multiplied by this number to give the
     * actual number of particles created every second. Default value is one.
     * Animatable. */

    @property float birthRate;

    /* The cell lifetime range is multiplied by this value when particles are
     * created. Defaults to one. Animatable. */

    @property float lifetime;

    /* The center of the emission shape. Defaults to (0, 0, 0). Animatable. */

    @property CGPoint emitterPosition;
    @property CGFloat emitterZPosition;

    /* The size of the emission shape. Defaults to (0, 0, 0). Animatable.
     * Depending on the `emitterShape' property some of the values may be
     * ignored. */

    @property CGSize emitterSize;
    @property CGFloat emitterDepth;

    /* Multiplies the cell-defined particle velocity. Defaults to one.
     * Animatable. */

    @property float velocity;

    /* Multiplies the cell-defined particle scale. Defaults to one. Animatable. */

    @property float scale;

    /* Multiplies the cell-defined particle spin. Defaults to one. Animatable. */

    @property float spin;

    你需要知道的非常重要的细节:

    CAEmitterCell的动画属性挺多的,但有点奇葩的是,必须是通过KVC设置值才行的通,而且,动画结束时的值也必须通过KVC设置才有效......

    //
    //  RootViewController.m
    //  Cell
    //
    //  Copyright (c) 2014年 Y.X. All rights reserved.
    //
    
    #import "RootViewController.h"
    #import "YXGCD.h"
    
    @interface RootViewController ()
    
    @end
    
    @implementation RootViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        self.view.backgroundColor  = [UIColor blackColor];
        
        // 创建粒子Layer
        CAEmitterLayer *snowEmitter = [CAEmitterLayer layer];
        
        // 粒子发射位置
        snowEmitter.emitterPosition = CGPointMake(120,20);
        
        // 发射源的尺寸大小
        snowEmitter.emitterSize = self.view.bounds.size;
        
        // 发射模式
        snowEmitter.emitterMode = kCAEmitterLayerSurface;
        
        // 发射源的形状
        snowEmitter.emitterShape = kCAEmitterLayerLine;
        
        // 创建雪花类型的粒子
        CAEmitterCell *snowflake = [CAEmitterCell emitterCell];
        
        // 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 =10.0;
        
        // 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:@"snow"] CGImage];
        
        // 设置雪花形状的粒子的颜色
        snowflake.color = [[UIColor whiteColor] CGColor];
        
        snowEmitter.shadowOpacity = 1.0;
        snowEmitter.shadowRadius = 0.0;
        snowEmitter.shadowOffset = CGSizeMake(0.0, 0.0);
        
        // 粒子边缘的颜色
        snowEmitter.shadowColor = [[UIColor whiteColor] CGColor];
        
        // 粒子的名字
        snowflake.name = @"snow";
        
        // 添加粒子
        snowEmitter.emitterCells = @[snowflake];
        
        // 将粒子Layer添加进图层中
        [self.view.layer addSublayer:snowEmitter];
        
        // 7秒后执行
        [[GCDQueue mainQueue] execute:^{
            
            // 设置基本动画
            CABasicAnimation *ani = 
                [CABasicAnimation animationWithKeyPath:@"emitterCells.snow.birthRate"];
            ani.fromValue = @(20.0);
            ani.toValue   = @(0.0);
            ani.duration  = 12.f;
            
            // 设置结束时的值
            [snowEmitter setValue:[NSNumber numberWithFloat:0]
                       forKeyPath:@"emitterCells.snow.birthRate"];
            
            // 添加动画
            [snowEmitter addAnimation:ani forKey:nil];
            
        } afterDelay:NSEC_PER_SEC * 7];
    }
    
    
    @end
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  • 原文地址:https://www.cnblogs.com/YouXianMing/p/3785876.html
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