iOS 粒子系统
-(void)awakeFromNib
{
fireEmitter = (CAEmitterLayer*)self.layer;//设置自己的层为CAEmitterLayer的层
fireEmitter.emitterPosition =CGPointMake(50,50); //设置发射器位置
fireEmitter.emitterSize = CGSizeMake(10, 10); //发射器尺寸
CAEmitterCell* fire = [CAEmitterCellemitterCell];//发射器单元
fire.birthRate =0;//产生速度
fire.lifetime =3.0;//生命
fire.lifetimeRange =0.5;//生命范围
fire.color = [[UIColorcolorWithRed:0.8green:0.4blue:0.2alpha:0.1]CGColor]; //颜色 注意一定是cgcolor
fire.contents = (id)[[UIImageimageNamed:@"Particles_fire.png"]CGImage];//图片 注意一定是cgimage
[fire setName:@"fire"];//name
fire.velocity =10;//速度
fire.velocityRange =20;//速度范围
fire.emissionRange =M_PI_2;//散发
fire.scaleSpeed =0.3;//速度放大
fire.spin =0.5;//旋转，眩晕
fireEmitter.renderMode =kCAEmitterLayerAdditive;//叠加模式
//add the cell to the layer and we're done
fireEmitter.emitterCells = [NSArrayarrayWithObject:fire];//单元数组
}
+ (Class) layerClass//3
{
//configure the UIView to have emitter layer
return [CAEmitterLayerclass]; //返回层类
}
-(void)setEmitterPositionFromTouch: (UITouch*)t
{
//change the emitter's position
fireEmitter.emitterPosition = [tlocationInView:self];
}
-(void)setIsEmitting:(BOOL)isEmitting
{
//turn on/off the emitting of particles
[fireEmittersetValue:[NSNumbernumberWithInt:isEmitting?200:0]forKeyPath:@"emitterCells.fire.birthRate"];
}
//viewController
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[fireViewsetEmitterPositionFromTouch: [touches anyObject]];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[fireViewsetEmitterPositionFromTouch: [touches anyObject]];
[fireViewsetIsEmitting:YES];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[fireViewsetIsEmitting:NO];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
[fireViewsetIsEmitting:NO];
}