如何在UIImageView中动画图像的变化?

我有一个带有图像的UIImageView。现在我有一个全新的图像(图形文件)，并想要在这个UIImageView中显示它。如果我设置

myImageView.image = newImage;

新图像立即可见。不可以做成动画。

我想让它很好地淡出到新图像中。我想也许有比在上面创建一个新的UIImageView并与动画混合更好的解决方案?

当前回答

Swift 5扩展:

extension UIImageView{
    func setImage(_ image: UIImage?, animated: Bool = true) {
        let duration = animated ? 0.3 : 0.0
        UIView.transition(with: self, duration: duration, options: .transitionCrossDissolve, animations: {
            self.image = image
        }, completion: nil)
    }
}

2020-07-14 17:56:29

其他回答

斯威夫特5:

当处理collectionView时。只加载一个项目或多个项目的动画。当改变单元格图像时，我尝试了一些不同的动画选项，没有区别，所以我没有在这里指明动画名称。

UIView.animate(withDuration: 1.0) { [weak self] in
                guard let self = self else { return print("gotchya!") }
                self.collectionView.reloadItems(at: [indexPath])
            }

2021-01-10 18:29:42

Swift 5扩展:

extension UIImageView{
    func setImage(_ image: UIImage?, animated: Bool = true) {
        let duration = animated ? 0.3 : 0.0
        UIView.transition(with: self, duration: duration, options: .transitionCrossDissolve, animations: {
            self.image = image
        }, completion: nil)
    }
}

2020-07-14 17:56:29

使用Swift 3

extension UIImageView{   
 var imageWithFade:UIImage?{
        get{
            return self.image
        }
        set{
            UIView.transition(with: self,
                              duration: 0.5, options: .transitionCrossDissolve, animations: {
                                self.image = newValue
            }, completion: nil)
        }
    }
}

用法:

myImageView.imageWithFade = myImage

2017-10-29 17:41:03

这太棒了

  self.imgViewPreview.transform = CGAffineTransform(scaleX: 0, y: 0)
          UIView.animate(withDuration: 1, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0, options: .curveEaseOut, animations: {
              self.imgViewPreview.image = newImage
              self.imgViewPreview.transform = .identity
          }, completion: nil)

2019-10-09 10:43:28

用迈克尔·斯科特的话来说，傻瓜，保持简单。以下是在Swift 3和Swift 4中实现这一点的简单方法:

UIView.transition(with: imageView,
                  duration: 0.75,
                  options: .transitionCrossDissolve,
                  animations: { self.imageView.image = toImage },
                  completion: nil)

2016-11-07 18:32:53

如何在UIImageView中动画图像的变化?

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