Question

the label is not animating  . . . .  



  UILabel * m_pLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 10, 100, 40)];

  [m_pLabel setBackgroundColor:[UIColor redColor]];

  [self.view addSubview:m_pLabel];


  CABasicAnimation * m_pAnimationObj = [CABasicAnimation animationWithKeyPath:@"key"];

  [m_pAnimationObj setFromValue:[NSValue valueWithCGRect:CGRectMake(100, 10, 100, 40)]];

  [m_pAnimationObj setToValue:[NSValue valueWithCGRect:CGRectMake(100, 500, 100, 40)]];

  m_pAnimationObj.duration = 5.0;

  m_pAnimationObj.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

  [m_pLabel.layer addAnimation:m_pAnimationObj forKey:@"key"];

Answer 1

试试这个..希望这会对你有帮助。

 UILabel * m_pLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 10, 100, 40)];

    [m_pLabel setBackgroundColor:[UIColor redColor]];

    [self.view addSubview:m_pLabel];


    CABasicAnimation * m_pAnimationObj = [CABasicAnimation animationWithKeyPath:@"transform.translation"];

    [m_pAnimationObj setFromValue:[NSValue valueWithCGRect:CGRectMake(100, 10, 100, 40)]];

    [m_pAnimationObj setToValue:[NSValue valueWithCGRect:CGRectMake(100, 500, 100, 40)]];

    m_pAnimationObj.duration = 1.0;

    m_pAnimationObj.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    [m_pLabel.layer addAnimation:m_pAnimationObj forKey:@"animations"];

Answer 2

有很多关于如何动画UIView的教程：How To Use UIView Animation Tutorial 这里还有一个可能有用的例子

//UIViewAnimationOptionAutoreverse option, try the code below:

UIView * testView = [[UIView alloc] initWithFrame:CGRectMake(20.0f, 100.0f, 300.0f,    200.0f)];
[testView setBackgroundColor:[UIColor blueColor]];
[self.view addSubview:testView];

[UIView animateWithDuration:0.3f
                  delay:0.0f
                options:UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse
             animations:^{
                 [testView setFrame:CGRectMake(0.0f, 100.0f, 300.0f, 200.0f)];
             }
             completion:nil];

[testView release];

Answer 3

目前，您要求动画处理@“key”属性，因为它在逻辑上应该是@“frame”属性。但是，无论如何，这都不适用于某个层。动画必须知道应用指定更改的内容，但它还需要能够将更改应用于“true”属性。 “frame”是派生属性。

更改“位置”动画所需的位置，并更改“边界”属性动画所需的大小。

请参阅此Apple技术说明：http://developer.apple.com/library/mac/qa/qa1620/_index.html

CABasicAnimation中的问题是在ios中将帧从位置更改为另一个位置

3 个答案: