禁用CALayer移动时的动画效果

Question

以下代码实现了移动效果，但我没有使用beginAnimations:context。如何使其在不进行动画的情况下移动？这是一个新的iPhone视图项目，这些是对它唯一的更新。

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];

    sublayer = [CALayer new];
    sublayer.backgroundColor = [[UIColor redColor] CGColor];
    sublayer.frame = CGRectMake(0, 0, 100, 100);

    [self.view.layer addSublayer:sublayer];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    sublayer.position = [[touches anyObject] locationInView:self.view];
}

- Sean Clark Hess

Answer 1

最简单的方法是通过将位置代码放入事务中来覆盖动画持续时间：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [CATransaction begin];
    [CATransaction setAnimationDuration:0];
    sublayer.position = [[touches anyObject] locationInView:self.view];
    [CATransaction commit];
}

- Laurent Etiemble

Answer 2

更简单的方式：

sublayer.position = [[touches anyObject] locationInView:self.view];
[sublayer removeAnimationForKey:@"position"];

注：以上代码涉及it技术，无法进行解释。

- CodeShift