Question

我正在构建一个使用一些图像的游戏，我将它们加载到UIImageViews中。通过进行一些测试，我意识到加载图像时内存会增加，但是当我从superview中删除UIImageView时，内存不会减少。

例：
- 初始记忆：50mb
- 然后我在许多UIImageViews（在UIView里面）加载一些图像 - 记忆达到约70mb
- 从superview中删除所有UIImageViews，然后删除UIView
- 记忆保持70mb

似乎加载的PNG（在这种情况下，我使用资产来存储所有这些）保留在内存/缓存中，并且只在应用关闭时“解除”。

我该如何解决这个问题？当应用程序大约70-80mb时，应用程序开始变慢，这非常令人沮丧。

Answer 1

您可以使用此代码，它不会将图像存储在缓存中

extension UIImageView {
    func downloadedFrom(url: URL, contentMode mode: UIViewContentMode = .scaleToFill) {
        contentMode = mode
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data, error == nil,
                let image = UIImage(data: data)
                else { return }
            DispatchQueue.main.async() {
                self.image = image
            }
            }.resume()
    }
    func downloadedFrom(link: String, contentMode mode: UIViewContentMode = .scaleToFill ) {
        guard let url = URL(string: link) else { return }
        downloadedFrom(url: url, contentMode: mode)
    }
    func downloadimageFrom(url: URL, contentMode mode: UIViewContentMode = .scaleToFill) {
        contentMode = mode
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data, error == nil,
                let image = UIImage(data: data)
                else { return }
            DispatchQueue.main.async() {

                self.image = image

            }
            }.resume()
    }
    func downloadimageFrom(link: String, contentMode mode: UIViewContentMode = .scaleToFill ) {
        guard let url = URL(string: link) else { return }
        downloadimageFrom(url: url, contentMode: mode)
    }


}

Swift - 加载PNG而不缓存

1 个答案: