无法让CAEmitterLayer显示粒子

Question

我已阅读了一些教程并查看了文档，但我无法让我的CAEmitterLayer显示任何粒子。我有一个CAEmitterLayer和CAEmitterCell属性，它们都具有nonatomic和storng属性。也许我错过了一步，但我已经导入了QuartzCore，这是我设置我在viewDidLoad中调用的图层和单元格的方法：

-(void) setupEmitter{

 self.emitterLayer = [CAEmitterLayer layer];
 self.emitterLayer.bounds = CGRectMake(0, 0, 200,200);
 self.emitterLayer.position = CGPointMake(100,100);
 self.emitterLayer.backgroundColor = [[UIColor clearColor] CGColor];
 self.emitterLayer.emitterPosition = CGPointMake(100, 100);
 self.emitterLayer.emitterSize = CGSizeMake(100, 100);
 [self.view.layer addSublayer:self.emitterLayer];
}


-(void) setupEmitterCell {

 self.emitterCell = [CAEmitterCell emitterCell];
 self.emitterCell.name = @"goldstar";
 self.emitterCell.contents = (id)[UIImage imageNamed:@"bokeh.png"].CGImage;
 self.emitterCell.birthRate = 66;
 self.emitterCell.lifetime = 0.5;;
 self.emitterCell.lifetimeRange = 0.6;
 self.emitterCell.velocity = 300;
 self.emitterCell.emissionRange = 2 * M_PI;
 self.emitterCell.spin = 0.0;
 self.emitterCell.spinRange = 4 * M_PI;
 self.emitterCell.color = [[UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:1.0] CGColor];
 self.emitterCell.scale = 1.0;
 self.emitterCell.scaleRange = 1.0;
 self.emitterCell.emitterCells = [NSArray arrayWithObjects:self.emitterCell, nil];
}

Answer 1

我可能是错的，但问题似乎是你忘了告诉发射器应该用什么作为细胞？也许使用[self.emitterLayer setEmitterCells:self.emitterCell];可能会有所帮助。