CAEmitterCell不尊重持续时间值 [英] CAEmitterCell does not respect the duration value
本文介绍了CAEmitterCell不尊重持续时间值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个发射器,我想在2秒后结束,但我不能让它停止运行!
I have an emitter that I want to end after 2 seconds, but I can't get it to stop running!
我的代码如下:
// Emitter Layer
//
emitter = [CAEmitterLayer layer];
emitter.emitterSize = CGSizeMake(20, 20);
emitter.renderMode = @"additive";
emitter.emitterMode = @"points";
emitter.emitterShape = @"rectangle";
emitter.emitterPosition = CGPointMake(310, 230);
//emitter.duration = 2; // setting duration on the emitterLayer prevents anything from firing it seems
// Emitter Cells
//
// 'New Emitter' cell configuration
newEmitter = [CAEmitterCell emitterCell];
newEmitter.scaleSpeed = 7;
newEmitter.lifetime = 2.481715;
//newEmitter.duration = 2; // I would expect this to stop the emitter after 2 seconds, but it doesn't!
newEmitter.velocity = 332.3636968085106;
newEmitter.contents = newemitterImg;
newEmitter.name = @"New Emitter";
newEmitter.scaleRange = 4.178236607142859;
newEmitter.lifetimeRange = 1.6;
newEmitter.greenRange = -2.775558e-17;
newEmitter.birthRate = 40;
newEmitter.emissionRange = -6.283185306666667;
newEmitter.scale = 0;
// Emitter Cell Chains
//
emitter.emitterCells = [NSArray arrayWithObjects:newEmitter, nil];
尽管作为iOS的一部分约2年,但似乎很少有关于此的信息!
There seems to be very little information on this available despite being a part of iOS for about 2 years!
推荐答案
您可以使用计时器和停止发射器生成新粒子的方法...
You can do this with a timer, and a method to stop the emitter generating new particles...
在现有代码的末尾添加:
At the end of your existing code add:
[newEmitter setName:@"newEmitter"];
[NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(stopEmitter:)
userInfo:nil
repeats:NO];
然后制作一个stopEmitter:方法......
Then make a stopEmitter: method…
- (void) stopEmitter:(NSTimer*)timer
{
[emitter setValue:@0
forKeyPath:@"emitterCells.newEmitter.birthRate"];
}
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