Swift 4-如何使用缓存加载图像

Question

我有UIImageView，如果存在，我想在缓存中下载图像，我使用了扩展函数。

我有这个代码，但不工作：

extension UIImageView {
func loadImageUsingCache (_ urlString : String) {
let imageCache = NSCache<AnyObject, AnyObject>()
if let cachedImage = imageCache.object(forKey: urlString as AnyObject) {
self.image = cachedImage as? UIImage
return
}
let url = URL(string: urlString)
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if data != nil {
if let image = UIImage(data: data!) {
imageCache.setObject(image, forKey: urlString as AnyObject)
DispatchQueue.main.async(execute: {
self.image = image
})
}
}
}.resume()
}
}

Answer 1

您正在为每个图像创建新的NSCache对象，而不是保留它。您应该创建对象变量，而不是本地变量。在这种情况下，它在扩展中不起作用。您也可以尝试使用URLCache.shared。

Answer 2

//这是完美的解决方案//

var imageCache=字符串：UIImage

类CustomImageView:UIImageView｛

var lastImgUrlUsedToLoadImage: String?
func loadImage(with urlString: String) {
// set image to nil
self.image = nil
// set lastImgUrlUsedToLoadImage
lastImgUrlUsedToLoadImage = urlString
// check if image exists in cache
if let cachedImage = imageCache[urlString] {
self.image = cachedImage
return
}
// url for image location
guard let url = URL(string: urlString) else { return }
// fetch contents of URL
URLSession.shared.dataTask(with: url) { (data, response, error) in
// handle error
if let error = error {
print("Failed to load image with error", error.localizedDescription)
}
if self.lastImgUrlUsedToLoadImage != url.absoluteString {
return
}
// image data
guard let imageData = data else { return }
// create image using image data
let photoImage = UIImage(data: imageData)
// set key and value for image cache
imageCache[url.absoluteString] = photoImage
// set image
DispatchQueue.main.async {
self.image = photoImage
}
}.resume()
}

}