不幸的是,您无法访问任何内部属性LPLinkView
,但您可以轻松创建自己的视图。这LPLinkMetadata
对象拥有您需要的一切,您只需要知道如何从其中提取图像iconProvider
and imageProvider
,它们是NSItemProvider
.
UIKit(iOS)
您可以使用NSItemProvdier
's loadObject(ofClass:)
方法轻松获得UIImage
。这有效是因为UIImage
符合NSItemProviderReading
协议。
import LinkPresentation
import UIKit
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
let url = URL(string: "https://stackoverflow.com/q/61286308/2101447")!
LPMetadataProvider().startFetchingMetadata(for: url) { (linkMetadata, error) in
guard let linkMetadata = linkMetadata, let imageProvider = linkMetadata.iconProvider else { return }
print(linkMetadata.title ?? "Untitled")
imageProvider.loadObject(ofClass: UIImage.self) { (image, error) in
guard error == nil else {
// handle error
return
}
if let image = image as? UIImage {
// do something with image
DispatchQueue.main.async {
imageView.image = image
}
} else {
print("no image available")
}
}
}
SwiftUI
SwiftUI 的Image
is a struct
,所以它不能符合NSItemProviderReading
。最简单的方法是使用上面的 UIKit 代码来获取UIImage
并实例化一个 SwiftUIImage
从那。
...
if let uiImage = loadedImage as? UIImage {
let image = Image(uiImage: uiImage)
}
应用套件 (macOS)
不同于它的UIImage
姐姐,NSImage
不符合NSItemProviderReading
,这意味着你必须使用NSItemProvdier
年纪大了loadItem(forTypeIdentifier:options:)
method.
您需要指定typeIdentifier
并初始化NSImage
from Data
你自己,但除此之外几乎是一样的。
import CoreServices // may be necessary for kUTTypeImage
import LinkPresentation
import AppKit
let imageView = NSImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
let url = URL(string: "https://stackoverflow.com/q/61286308/2101447")!
LPMetadataProvider().startFetchingMetadata(for: url) { (linkMetadata, error) in
guard let linkMetadata = linkMetadata, let imageProvider = linkMetadata.iconProvider else { return }
print(linkMetadata.title ?? "Untitled")
imageProvider.loadItem(forTypeIdentifier: kUTTypeImage as String, options: nil) { (data, error) in
guard error == nil else {
// handle error
return
}
guard let data = data as? Data else {
print("no image available")
return
}
if let image = NSImage(data: data) {
// do something with image
DispatchQueue.main.async {
self.imageView.image = image
}
} else {
print("no image available")
}
}
}