能产生粒子效果的CAEmitterLayer

//
//  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LayerCAEmitterLayer *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

//
//  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 upCAEmitterLayer *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 rocketCAEmitterCell* rocket = [CAEmitterCell emitterCell];rocket.birthRate        = 1.0;rocket.emissionRange    = 0.25 * M_PI;  // some variation in anglerocket.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 colorsrocket.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 valueCAEmitterCell* burst = [CAEmitterCell emitterCell];burst.birthRate            = 1.0;        // at the end of travelburst.velocity            = 0;burst.scale                = 2.5;burst.redSpeed            =-1.5;        // shiftingburst.blueSpeed            =+1.5;        // shiftingburst.greenSpeed        =+1.0;        // shiftingburst.lifetime            = 0.35;// and finally, the sparksCAEmitterCell* spark = [CAEmitterCell emitterCell];spark.birthRate            = 400;spark.velocity            = 125;spark.emissionRange        = 2* M_PI;    // 360 degspark.yAcceleration        = 75;        // gravityspark.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 togetherfireworksEmitter.emitterCells    = [NSArray arrayWithObject:rocket];rocket.emitterCells                = [NSArray arrayWithObject:burst];burst.emitterCells                = [NSArray arrayWithObject:spark];[self.view.layer addSublayer:fireworksEmitter];
}@end

//
//  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LayerCAEmitterLayer *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