如何从使用alamofire图像的json数组中检索图像?

Here is the piece of code i have used to get the images from url but the code crashes with the error posted below.Please someone help me to sort this.

下面是我用来从url获取图像的代码片段，但是代码会崩溃，错误发布在下面。请谁来帮我整理一下。

let imageurl = Gift.imagesUrl.replacingOccurrences(of: "\n", with: "", options: .regularExpression)

Alamofire.request(imageurl, method: .get).responseImage { response in
    print(response)
}

ERROR:

错误:

 FAILURE: invalidURL("(    \"https://s3.amazonaws.com/webdevapp/app/public/spree/products/2/product/ri1.jpg?1476104874\")")

3 个解决方案

#1

I can't let the solution being:

我不能让解决方案存在:

let string = urlstring.replacingOccurrences(of: "[\n \" )(]", with: "", options: .regularExpression, range: nil)

That's a hacky solution, not a viable one. It's a bad solution.

这是一种陈腐的解决方案，而不是可行的解决方案。这是一个糟糕的解决方案。

What is the real issue? The parsing to get the imagesUrl is wrong.

真正的问题是什么?解析获取imagesUrl是错误的。

You did this:

你这样做:

var _imagesUrl:String? 
var imagesUrl:String 
{ 

    if _imagesUrl == nil 
    { 
        _imagesUrl = "" 
    } 
    return _imagesUrl! 
} 

if let image = giftherData["master_variant_images"] as? NSArray 
{
    self._imagesUrl = String(describing: image) 
}

What's wrong?
Don't use NSArray in Swift3+. Use Swift Array.
Don't use String(describing:), that's not doing what you think it does. It's calling description method of the object (in your case an NSArray), that's why it added (, \n, ", ). You want the object, not the description.

怎么了?不要在Swift3+中使用NSArray。使用快速数组。不要用String(description:)，那不是你认为的那样。它调用对象的描述方法(在你的例子中是NSArray)，这就是它添加(，\n，)的原因。你想要的是对象，而不是描述。

Don't call your var imagesUrl with an "s" if it's only one, or you are only interested in the first one? That's unclear, and a misleading name.

如果你的var imagesUrl只有一个，不要用“s”来调用它，或者你只对第一个感兴趣?这是一个不清楚的、具有误导性的名字。

It should be:

应该是:

if let imageStringURLs = giftherData["master_variant_images"] as? [String] { //Yes, use a Swift Array of String, not a NSArray
    self._imagesUrl = imageStringURLs.first //I took presumption that you are only interested in the first one, of not, then use an array to save them, not a String.
}

or:

或者:

var _imagesUrl: [String]?
var imagesUrl: [String]?
//if nil as you did
if let imageStringURLs = giftherData["master_variant_images"] as? [String] { //Yes, use a Swift Array of String, not a NSArray
    self._imagesUrl = imageStringURLs
}

Then, you just do:

然后,你做的事:

Alamofire.request(Gift.imagesUrl).responseImage{ response in
        print(response)
}

or (using the array)

或(使用数组)

let firstURL = Gift.imagesUrl[0] //Or if it's the second let secondURL = Gift.imagesUrl[1], etc.
Alamofire.request(firstURL).responseImage{ response in
        print(response)
}

#2

Use this Code

使用这个代码

      let ImageURL = URL(string: "your image URL")!

      Alamofire.request(ImageURL).responseData { (response) in
         if response.error == nil {
            print(response.result)

           // Show the downloaded image:
             if let data = response.data {
                 self.downloadImage.image = UIImage(data: data)
            }                
        }
    }

#3

let urlstring  = Gift.imagesUrl
    let string = urlstring.replacingOccurrences(of: "[\n \" )(]", with: "", options: .regularExpression, range: nil)

    Alamofire.request(string).responseImage{ response in
        print(response)
    }

#1