6

我有一个CAEmitterCell,我已经设置了一个特定的颜色。文档说这个属性是可动画的,我想为我游戏中的不同玩家(所有玩家一开始都选择他们的颜色)在多种不同颜色之间制作动画。

这是我的EmitterCell设置:

//
    // Emitter Cells
    //

    // 'New Emitter' cell configuration
    newEmitter = [CAEmitterCell emitterCell];
    newEmitter.scaleSpeed = 10;
    newEmitter.lifetime = 2.481715;
    newEmitter.velocity = 332.3636968085106;
    newEmitter.contents = newemitterImg;
    newEmitter.name = @"New Emitter";
    newEmitter.color = [[UIColor colorWithRed:0.50 green:0.00 blue:1.00 alpha:1.00] CGColor];
    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];

这里是我在这种情况下测试颜色变化的地方,只是在两种不同颜色之间跳跃:

-(void)changeColor {

    if (color == 0) {
        color = 1;
        NSLog(@"color = 1");

        [UIView animateWithDuration:1.5 delay:0 options:0 animations:^{
            newEmitter.color = [[UIColor colorWithRed:0.50 green:0.00 blue:1.00 alpha:1.00] CGColor];
        } completion:^(BOOL finished) {[self performSelector:@selector(changeColor) withObject:nil afterDelay:2];}];
    } else {
        color = 0;
        NSLog(@"color = 0");
        [UIView animateWithDuration:1.5 delay:0 options:0 animations:^{
            newEmitter.color = [[UIColor colorWithRed:1.00 green:0.50 blue:0.10 alpha:1.00] CGColor];
        } completion:^(BOOL finished) {[self performSelector:@selector(changeColor) withObject:nil afterDelay:2];}];
    }

}

但是,当我运行它时,颜色永远不会改变。我在这里误解了“ Animatable ”的性质,还是我只需要以不同的方式处理它CAEmitterCell

4

3 回答 3

4

事实上,CAEmitterCells 是不同的。要使动画在它们上运行,您需要执行以下步骤:

1.为您的 CAEmitterCell 命名,例如:

newEmitter.name = @"fire";

2.通过CAEmitterLayer实例访问这个发射器的动画属性:

//Set first before doing CABasicAnimation so it sticks
newEmitter.redSpeed = 1.0;

//Access the property with this key path format: @"emitterCells.<name>.<property>"
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"emitterCells.fire.redSpeed"];
anim.fromValue = @(0.0);
anim.toValue = @(1.0);
anim.duration = 1.5;
anim.fillMode = kCAFillModeForwards;
[emitter addAnimation:anim forKey:@"emitterAnim"];
于 2014-04-21T22:09:47.760 回答
0

尝试这个:

    [newEmitter.emitterCells[0] setColor:[[UIColor yellowColor] CGColor]];
于 2016-05-24T07:18:59.380 回答
-1

您可以使用这些属性为发射器颜色设置动画。

newEmitter.redSpeed = 1.0;
newEmitter.greenSpeed = 1.0;
newEmitter.blueSpeed = 1.0;
于 2013-05-21T06:37:49.273 回答