iphone - 放大和缩小到 UIImage

Question

我需要根据音频文件为 UIImage 制作动画；当声音开始时，我需要缩放到某个点，然后应用相同的动画进行缩小。我试图应用 CGAffineTransformMakeScale 但它不会制作动画。将放大/缩小应用到图像的正确方法是什么？

Answer 1

把图片放到一个UIImageView中，然后用uiview动画，重新设置frame

例子 ：

首先，您像往常一样部署映像

 UIImage *myImg = [UIImage imageNamed:@"myImage.png"];
    UIImageView *myImgView = [[UIImageView alloc]initWithImage:myImg];
    [myImgView setFrame:CGRectMake(10, 10, 100, 100)];
    [self.view addSubview:myImgView];

然后你实现动画代码使视图更大

//START THE ANIMATION
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.0];
    [myImgView setFrame:CGRectMake(10, 10, 300, 300)]; //re-set your image view size so that it become bigger
    [UIView commitAnimations];

或者你可以使用方法 animate （这有点先进，但我认为更好）

//START THE ANIMATION
    [UIView animateWithDuration:1.0 animations:^
    {
        [myImgView setFrame:CGRectMake(10, 10, 300, 300)]; //re-set your image view size so that it become bigger
    } completion:^(BOOL finished)
     {
         //type here what you want your program to do after the animation finished
     }];

祝你好运：D