通过 AlamofireImage 下载 UIImage? [英] Downloading UIImage via AlamofireImage?

问题描述

我有一个 URL，想通过返回函数下载图像，但是我不能让它正常协作，这是我的函数:

I have a URL and want to download the image via a return function, however I cant get it to cooperate properly, here is my func:

func getTabImage(url: URL) -> UIImage {
    Alamofire.request(url)
        .responseImage { response in
            if let image = response.result.value {
                return image
            } else {
                print("Failed to get image")
            }
    }
}

我传入了 URL，并希望从 alamofire 响应返回一个 UIImage.

I pass in the URL, and want a UIImage returned from the alamofire response.

但是我明白了

void 函数中出现意外的非 void 返回值

Unexpected non-void return value in void function

用于返回语句.

我怎样才能正确地做到这一点?

How can i achieve this correctly?

推荐答案

您可以使用以下功能下载图片:

You can use the below function for downloading the image:

func getImage(_ url:String,handler: @escaping (UIImage?)->Void) {
        print(url)
        Alamofire.request(url, method: .get).responseImage { response in
            if let data = response.result.value {
                handler(data)
            } else {
                handler(nil)
            }
        }
    }

用途

getImage("http://") { (image) in
    if image != nil {
        print(image)
    }
}

或

如果您想在 UIImageView 上设置图像，请使用 AlamofireImage 的扩展名.

If you want to set the image on UIImageView use extension of AlamofireImage.

if let imageURL = URL(string: "http://"), let placeholder = UIImage(named: "default") {
     imageView.af_setImage(withURL: imageURL, placeholderImage: placeholder) //set image automatically when download compelete.
}

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