同时以不同的速度动画

Question

I want to perform animation of three labels with three different speeds. label1 with a duration of 1.0 second. label2 with a duration of 2.5 seconds. label3 with a duration of 5.0 seconds.

I tried "setAnimationDuration" method, but it was not working. Could anyone tell, where I am doing wrong?

Edit: complete Scenario: I have a scrollview. When I am swiping from right to left, background image is changing as each page of scrollview has different background image. With scrolling, labels also start animating and it seems that they are starting from next page and on complete scrolling, they stop to their specific position. I am performing animation on the basis of currentoffset.

Code:

- (void) scrollviewDidScroll:(UIScrollView *)scrollView{
    if(currentOffset > 1024)
        {
          [UIView beginAnimation: nil context:nil];
          [UIView setAnimationDuration: 1.0];
          label1.frame = CGRectMake(2048-currentoffset+ 100, Y, Width, Height);
          [UIView commitAnimation];
        }
    if(currentOffset > 1024)
        {
          [UIView beginAnimation: nil context:nil];
          [UIView setAnimationDuration: 2.5];
          label2.frame = CGRectMake(2048-currentoffset+ 100, Y+20, Width, Height);
          [UIView commitAnimation];
        }
    if(currentOffset > 1024)
        {
          [UIView beginAnimation: nil context:nil];
          [UIView setAnimationDuration: 5.0];
          label3.frame = CGRectMake(2048-currentoffset+ 100, Y+20, Width, Height);
          [UIView commitAnimation];
        }
      }

The problem is setAnimationDuration is not working.

Answer 1

尝试调用您将在每秒调用的方法中发布的代码，如下所示：

NSTimer *t = [[NSTimer alloc] initWithFireDate:nil interval:1.0 target:self selector:@selector(yourmethod) userInfo:nil repeats:YES];

Answer 2

Try this code.

[UIView animateWithDuration:1.0
                      delay:1.0
                    options:UIViewAnimationOptionTransitionNone
                 animations:^{
                      label3.frame = CGRectMake(2048-currentoffset+ 100, Y+20, Width, Height);
                 }
                 completion:^(BOOL completed) {

                 }
];

Answer 3

Try this:

- (void)scrollviewDidScroll:(UIScrollView *)scrollView {
    if(currentOffset > 1024) {

        [UIView animateWithDuration:1 animations:^{
            label1.frame = CGRectMake(2048-currentoffset+ 100, Y, Width, Height);
        }];

        [UIView animateWithDuration:2.5 animations:^{
            label2.frame = CGRectMake(2048-currentoffset+ 100, Y+20, Width, Height);
        }];

        [UIView animateWithDuration:5 animations:^{
            label3.frame = CGRectMake(2048-currentoffset+ 100, Y+20, Width, Height);
        }];
    }
}