Question

我已经在Stack以及其他各种网站上查看了这个问题的每个实例，它仍然没有为我工作。我想在动画处于会话状态时获取对象的位置。

这就是我所拥有的：

- (void)viewDidLoad{
    currentPosition = [[bikeMotion.layer presentationLayer] center]; //its a CGPoint
}

- (void)doAnimation {
    bikeMotion = [[DotAnimation alloc]initWithFrame:CGRectMake((*bikePathPoints)[0].x, (*bikePathPoints)[0].y, 8, 8)];

    //... [self animate stuff]...
    [NSTimer scheduledTimerWithTimeInterval:0.07f target:self selector:@selector(backgroundAnimations) userInfo:nil repeats:YES];
}

-(void)backgroundAnimations{
    cout << currentPosition.x << endl;

}

我也试过这个：

- (void)viewDidLoad{
    currentPosition = [[bikeMotion.layer presentationLayer] frame]; //its a CGRect
}

- (void)doAnimation {
    bikeMotion = [[DotAnimation alloc]initWithFrame:CGRectMake((*bikePathPoints)[0].x, (*bikePathPoints)[0].y, 8, 8)];
    //...[self animation stuff];
    [NSTimer scheduledTimerWithTimeInterval:0.07f target:self selector:@selector(backgroundAnimations) userInfo:nil repeats:YES];
}

-(void)backgroundAnimations{
    cout << currentPosition.origin.x << endl;

}

我甚至试过这个：

- (void)viewDidLoad{
    p = (CALayer*)[bikeMotion.layer presentationLayer];

}

-(void)doAnimation{
    bikeMotion = [[DotAnimation alloc]initWithFrame:CGRectMake((*bikePathPoints)[0].x, (*bikePathPoints)[0].y, 8, 8)];
    [NSTimer scheduledTimerWithTimeInterval:0.07f target:self selector:@selector(backgroundAnimations) userInfo:nil repeats:YES];
}

-(void)backgroundAnimations{
    CGPoint position = [p position];
    cout << position.x << endl;
}

Answer 1

你试过object.layer.anchorpoint吗？您需要导入QuartzCore。

UIView在动画中获取位置

1 个答案: