Question

我有一个名为

的方法

- (void) startAnimationForTime : (NSNumber* ) time {

我从我的代码中的其他地方打电话。它在我第一次调用该方法时效果很好，但是当我用其他一些持续时间调用它时，它仍然会以之前的持续时间动画。动画速度不会改变。假设我是第一次这样调用我的方法...

[self performSelectorOnMainThread:@selector(startAnimationForTime:) withObject:[NSNumber numberWithFloat:20.0] waitUntilDone:NO];

如果我从其他地方称之为，

[self performSelectorOnMainThread:@selector(startAnimationForTime:) withObject:[NSNumber numberWithFloat:10.0] waitUntilDone:NO];

预计动画速度会发生变化，但事实并非如此。我在这里发布我的动画方法......

在我的代码中的其他一些方法中，

  animator1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"beach_bg.png"]];
  animator2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"beach_bg.png"]];

  animator1.frame = CGRectMake(0,-bgHeight,320,bgHeight);
  animator2.frame = CGRectMake(0,0,320,bgHeight);



- (void) startAnimationForTime : (NSNumber*) time {

    animator1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"beach_bg.png"]];
    animator2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"beach_bg.png"]];

    [self.view addSubview:animator1];
    [self.view addSubview:animator2];
    [self.view addSubview:playTime];
    [self.view addSubview:pauseButton];
    [self.view addSubview:bgImageView];

    animator1.frame = CGRectMake(0,-bgHeight,320,bgHeight);
    animator2.frame = CGRectMake(0,0,320,bgHeight);

    [UIView animateWithDuration:[time floatValue]
                          delay:0.0
                        options:UIViewAnimationOptionRepeat | UIViewAnimationOptionCurveLinear
                     animations:^{
                         animator2.transform = CGAffineTransformMakeTranslation(0, bgHeight);  }
                     completion:^(BOOL fin) { if (fin){}}];

    [UIView animateWithDuration:[time floatValue]
                          delay:0.0
                        options:UIViewAnimationOptionRepeat | UIViewAnimationOptionCurveLinear
                     animations:^{
                         animator1.transform = CGAffineTransformMakeTranslation(0, bgHeight);  }
                     completion:^(BOOL fin) { if (fin){}}];

}

我第二次尝试使用这个方法，

animator1.frame = [[animator1.layer presentationLayer]frame];

animator2.frame = [[animator2.layer presentationLayer]frame];

这会让我获得animator1和animator2的当前帧。但这也不起作用。我很难坚持这个......

任何帮助都将非常感谢....

提前致谢..

Answer 1

请将此代码放在

之前

 animator1.frame = CGRectMake(0,-bgHeight,320,bgHeight);
    animator2.frame = CGRectMake(0,0,320,bgHeight);

这个

[self.view addSubview:animator1];
    [self.view addSubview:animator2];
    [self.view addSubview:playTime];
    [self.view addSubview:pauseButton];
    [self.view addSubview:bgImageView];

并尝试制作动画。希望这有帮助

UIView animateWithDuration在持续时间更改时不动画

1 个答案: