如何将图像从HTTP请求加载到UIButton Swift中

Question

我一直在从我的API获取图像，过去我已经将它们加载到UIImage中，扩展名如下。但是，现在我正在尝试从 API 获取图像并将它们加载到 UIButton 图像视图中。我不知道如何处理扩展和其他代码以使其工作。我感谢您的帮助！

外延

Extension UIImageView {
func getURL2(url: URL, contentMode mode: UIViewContentMode = .scaleAspectFit) {
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),
httpURLResponse.url == url
else { return }
DispatchQueue.main.async() {
self.image = image
}
}.resume()
}
func downloadedFrom2(link: String, contentMode mode: UIViewContentMode = .scaleAspectFit) {
guard let url = URL(string: link) else { return }
getURL2(url: url, contentMode: mode)
}
}

其他代码

func loadProfilePhoto(image: UIButton, link: String) {
image.downloadedFrom2(link: link)
image.imageView!.clipsToBounds = true
image.imageView!.layer.cornerRadius = (image.imageView!.frame.height) / 2
image.imageView!.contentMode = .scaleAspectFill
}
func loadRandom8() {
if self.users.count == 8 {
let completelink1 = users[0].picture_url
//ex. https://api.adorable.io/avatars/200/AngelicAlling.png
let completelink2 = users[1].picture_url
let completelink3 = users[2].picture_url
let completelink4 = users[3].picture_url
let completelink5 = users[4].picture_url
let completelink6 = users[5].picture_url
let completelink7 = users[6].picture_url
let completelink8 = users[7].picture_url
loadProfilePhoto(image: p2Image, link: completelink1)
loadProfilePhoto(image: p2Image, link: completelink2)
loadProfilePhoto(image: p3Image, link: completelink3)
loadProfilePhoto(image: p4Image, link: completelink4)
loadProfilePhoto(image: p5Image, link: completelink5)
loadProfilePhoto(image: p6Image, link: completelink6)
loadProfilePhoto(image: p7Image, link: completelink7)
loadProfilePhoto(image: p8Image, link: completelink8)

Answer 1

您当前的扩展适用于UIImageView，但您希望在UIButton中加载图像，因此请将扩展名更改为UIButton，并确保按钮的类型设置为"自定义"而不是"系统"。您可以从情节提要执行此操作。

extension UIButton {
func getURL2(url: URL, contentMode mode: UIViewContentMode = .scaleAspectFit) {
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),
httpURLResponse.url == url
else { return }
DispatchQueue.main.async() {
self.setImage(image, for: .normal)
self.imageView?.contentMode = mode
}
}.resume()
}

public func downloadedFrom2(link: String, contentMode mode: UIViewContentMode = .scaleAspectFit) {
guard let url = URL(string: link) else { return }
getURL2(url: url, contentMode: mode)

}
}

如果它对您不起作用，请阅读此内容