扩展：https://github.com/lichtschlag/Dazzle
//创建出Layer
CAEmitterLayer *emitterLayer = [CAEmitterLayer layer];
//显示边框
emitterLayer.borderWidth = ;
//给定尺寸
emitterLayer.frame = CGRectMake(, , , );
// emitterLayer.masksToBounds = YES;
//发射点
emitterLayer.emitterPosition = CGPointMake(, );
//发射模式
emitterLayer.emitterMode = kCAEmitterLayerSurface;
//发射形状
emitterLayer.emitterShape = kCAEmitterLayerLine;
//添加Layer
[self.view.layer addSublayer:emitterLayer];
CAEmitterCell *cell = [CAEmitterCell emitterCell];
//粒子产生率
cell.birthRate = .f;
//粒子生命周期
cell.lifetime = .f;
//速度值
cell.velocity = ;
//速度值得微调值
cell.velocityRange = .f;
//y轴加速度
cell.yAcceleration = .f;
//发射角度(角度越大偏移越大)
cell.emissionRange = .f *M_1_PI;
//设置粒子颜色
// cell.color = [UIColor blackColor].CGColor;
//设置图片
cell.contents = (__bridge id)([UIImage imageNamed:@"test1"].CGImage);
emitterLayer.emitterCells = @[cell];
效果图：
例子：下雪下雨的封装
基类：WJCAEmitterLayerView
#import <UIKit/UIKit.h> @interface WJCAEmitterLayerView : UIView
/**
* 模仿setter getter方法
*/
- (void)setEmitterLayer:(CAEmitterLayer *)layer;
- (CAEmitterLayer *)emitterLayer; /**
* 显示当前View
*/
- (void)show;
/**
* 隐藏当前View
*/
- (void)hide; @end
#import "WJCAEmitterLayerView.h"
@interface WJCAEmitterLayerView () {
CAEmitterLayer *_emitterLayer;
}
@end
@implementation WJCAEmitterLayerView
+ (Class)layerClass {
return [CAEmitterLayer class];
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
_emitterLayer = (CAEmitterLayer *)self.layer;
}
return self;
}
- (void)setEmitterLayer:(CAEmitterLayer *)layer {
}
- (CAEmitterLayer *)emitterLayer {
return _emitterLayer;
}
- (void)show {
}
- (void)hide {
}
@end
封装下雪下雨view集成基类
下雪：
#import "SnowView.h"
@implementation SnowView
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initEmitterLayerProperties];
}
return self;
}
- (void)initEmitterLayerProperties {
//初始化一些参数
// self.emitterLayer.masksToBounds = YES;
self.emitterLayer.emitterShape = kCAEmitterLayerLine;
self.emitterLayer.emitterMode = kCAEmitterLayerSurface;
self.emitterLayer.emitterSize = self.frame.size;
self.emitterLayer.emitterPosition = CGPointMake(self.bounds.size.width/.f, );
}
- (void)show {
//添加 CAEmitterCell
CAEmitterCell *snowflake = [CAEmitterCell emitterCell];
snowflake.birthRate = .f;
snowflake.speed = .f;
snowflake.velocity = .f;
snowflake.velocityRange = .f;
snowflake.yAcceleration = .f;
snowflake.emissionRange = 0.5 *M_PI;
snowflake.spinRange = 0.25 *M_PI;
snowflake.contents = (__bridge id)([UIImage imageNamed:@"test1"].CGImage);
snowflake.color = [UIColor redColor].CGColor;
snowflake.lifetime = .f;
snowflake.scale = 0.5;
snowflake.scaleRange = 0.3;
//添加动画
self.emitterLayer.emitterCells = @[snowflake];
}
- (void)hide {
}
@end
下雨：
#import "RainView.h"
@implementation RainView
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self initEmitterLayerProperties];
}
return self;
}
- (void)initEmitterLayerProperties {
//初始化一些参数
self.emitterLayer.masksToBounds = YES;
self.emitterLayer.emitterShape = kCAEmitterLayerLine;
self.emitterLayer.emitterMode = kCAEmitterLayerSurface;
self.emitterLayer.emitterSize = self.frame.size;
self.emitterLayer.emitterPosition = CGPointMake(self.bounds.size.width/.f, );
}
- (void)show {
//添加 CAEmitterCell
CAEmitterCell *snowflake = [CAEmitterCell emitterCell];
snowflake.birthRate = .f;
snowflake.speed = .f;
snowflake.velocity = .f;
snowflake.velocityRange = .f;
snowflake.yAcceleration = .f;
// snowflake.emissionRange = 0.5 *M_PI;
// snowflake.spinRange = 0.25 *M_PI;
snowflake.contents = (__bridge id)([UIImage imageNamed:@"test1"].CGImage);
snowflake.color = [UIColor greenColor].CGColor;
snowflake.lifetime = .f;
snowflake.scale = 0.2;
snowflake.scaleRange = .f;
//添加动画
self.emitterLayer.emitterCells = @[snowflake];
}
- (void)hide {
}
@end
调用：
WJCAEmitterLayerView *snoView = [[SnowView alloc]initWithFrame:CGRectMake(, ,CGRectGetWidth(self.view.bounds), )];
[self.view addSubview:snoView];
[snoView show];
// snoView.maskView = alpaView;可以让边缘模糊