图像的动画

Question

我有一个scrollview和imageview子视图到scrollview。按一下按钮我subview另一个imageview并将该图片发送到后面

的现有形象

[nextImageView sendSubviewToBack:firstImageView];

我希望firstImageView淡出并在点击按钮上显示第二个图像，然后点击按钮我希望反向也发生

Answer 1

好的，根据我的理解，您希望在点击按钮时“切换”几个图像。尝试以下操作，其中“img1”是第一个UIImageView，第二个UIImageView中的“img2”。这称为animation block。

-(IBAction)showSecondImg:(id)sender {

     // Some code to add Img2 subview behind Img1..

     [UIImageView animateWithDuration:1 // <--  Number of seconds 
                     animations:^{
                     img1.alpha = 0; // <-- fade out in 1 second and shows Img2 below it
                     //add other animations here, like background color, etc. if needed.
                     }
     ];
}

-(IBAction)showFirstImg:(id)sender {

          // gradually fades the first UIImageView back on top
         [UIImageView animateWithDuration:1 
                         animations:^{
                         img1.alpha = 1;
                         }
         ];
    }

Answer 2

调整@ jhilgert00的答案.....

-(IBAction)toggleImage:(id)sender {

     if (img1.alpha==1)
     {

     [UIImageView animateWithDuration:1 // <--  Number of seconds 
                     animations:^{
                     img1.alpha = 0; 
                     img2.alpha = 1;

                     }];
     }
     else
     {
      [UIImageView animateWithDuration:1 // <--  Number of seconds 
                     animations:^{
                     img1.alpha = 1; 
                     img2.alpha = 0;

                     }];     



     }


}