Question

我有3个不同的精灵。我想连续动画从屏幕底部进入的这三个不同的精灵，随着进入的物体数量的增加而增加速度。此外，这三个应该是随机顺序。

所以，我尝试使用以下代码来获取任何随机顺序的三个sprite中的任何一个，但它没有按预期工作：

int randomNumber;

for (int i = 1; i<500; i++) {
    randomNumber = arc4random_uniform(3);
    NSLog(@"Value of random Number %d" ,randomNumber);

if (randomNumber == 0) {
        [self addRedBall];
        SKAction *moveBall = [SKAction moveToY:CGRectGetMaxY(self.frame) duration:5];

    dispatch_queue_t actionDispatchRed;

    actionDispatchRed = dispatch_queue_create("com.redball.dispatch", NULL);

    dispatch_async(actionDispatchRed, ^ {   [redBall runAction:moveBall];   });
    [NSThread sleepForTimeInterval:2];   //Time interval to wait before the next ball comes in.

    }

else if (randomNumber == 1) {
        [self addBlueBall];

        dispatch_queue_t actionDispatchBlue;

        SKAction *moveBall = [SKAction moveToY:CGRectGetMaxY(self.frame) duration:5];
        actionDispatchBlue = dispatch_queue_create("com.blueball.dispatch", NULL);

        dispatch_async(actionDispatchBlue, ^{  [blueBall runAction:moveBall];  });
        [NSThread sleepForTimeInterval:2];


    }
else if (randomNumber == 2) {
        [self addGreenBall];
        SKAction *moveBall = [SKAction moveToY:CGRectGetMaxY(self.frame) duration:5
                              ];
        dispatch_queue_t actionDispatchGreen;
        actionDispatchGreen = dispatch_queue_create("com.greenball.dispatch", NULL);

        dispatch_async(actionDispatchGreen,
                       ^ {  [greenBall runAction:moveBall]; } );

    [NSThread sleepForTimeInterval:2];

    }


}

当我使用[NSThread sleepForTimeInterval：2]时; ，程序不会比起始屏幕更进一步。

当我尝试在没有sleepForTimeInterval的情况下运行程序时，会有大量的精灵进入并相互重叠，导致只有一个可见的精灵。

请帮忙。

Answer 1

我不建议使用[NSThread sleepForTimeInterval:2];

而是尝试使用[self performSelector:@selector(addBall) withObject:nil afterDelay:2];

-(void)addBall
{
    self.addedBall++;
    if (self.addedBall > 500)
    {
        return;
    }

    randomNumber = arc4random_uniform(3);

    if (randomNumber == 0) {
        [self addRedBall];
        SKAction *moveBall = [SKAction moveToY:CGRectGetMaxY(self.frame) duration:5];

        dispatch_queue_t actionDispatchRed;

        actionDispatchRed = dispatch_queue_create("com.redball.dispatch", NULL);

        dispatch_async(actionDispatchRed, ^ {   [redBall runAction:moveBall];   });

        [self performSelector:@selector(addBall) withObject:nil afterDelay:2];
    }
    //other else if stuff

}

此外，我不确定您为什么在dispatch_queue中运行SKActions，可能不需要。

我希望有所帮助。

如何以逐渐增加的速度以随机顺序添加和动画来自屏幕底部的无限数量的对象？

1 个答案: