Removing image from UIImageView

清除UIImageView中的图片

最新推荐文章于 2020-09-05 22:37:00 发布

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最新推荐文章于 2020-09-05 22:37:00 发布

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本文讨论了如何在iOS应用中彻底清除UIImageView中的图片，使其恢复到初始状态。作者尝试了多种方法，包括设置myImageView.image=nil，但图片仍无法清除。最终通过使用动画的方式实现了图片的完全清除。

I load a UIImageView with an image depending on user interaction. When the parent view is initially displayed, no image has been selected and the imageview is black. If the user leaves that view and comes back, the image is still there. I've tried

myImageView.image = nil;

upon leaving the view but the image remains. How can I remove the image so the imageview appears black again?

The UIImageView is connected through IB.

Setting the UIImageView as:

myImageView.image = nil

is the correct way to clear an UIImageView. Are you loading the image when your calling function returns? Is your UIImageView being declared, and/or used elsewhere in your main function?

I also got the same problem, no matter I use myImageView.image = nil or [myImageView setImage:nil] the image still show on the UIImageView; assuming either one should works. It spend me many hours to debug and find out where have problem. Finally, I did it by using the following code,

        [UIView beginAnimations:nil context:nil];
        [UIView animateWithDuration:1 animations:nil];
        myImageView.image = nil;
        [UIView commitAnimations];