Cowboy Tech

Alamofire简介

发表于  |    |   分类于   |  

Making a Request

1
2
import Alamofire
Alamofire.request("https://httpbin.org/get")

Response JSON Handler

1
2
3
4
5
6
7
8
9
10
Alamofire.request("https://httpbin.org/get").responseJSON { response in
    print(response.request)  // original URL request
    print(response.response) // HTTP URL response
    print(response.data)     // server data
    print(response.result)   // result of response serialization

    if let JSON = response.result.value {
        print("JSON: \(JSON)")
    }
}

Downloading Data to a File

Download data to a temporary file on-disk

1
2
3
4
5
Alamofire.download("https://httpbin.org/image/png").responseData { response in
    if let data = response.result.value {
        let image = UIImage(data: data)
    }
}

Download File Destination

1
2
3
4
5
6
7
8
9
10
11
12
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let fileURL = documentsURL.appendPathComponent("pig.png")
    return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}

Alamofire.download(urlString, to: destination).response { response in
    print(response)
    if response.result.isSuccess, let imagePath = response.destinationURL?.path {
        let image = UIImage(contentsOfFile: imagePath)
    }
}

Suggested download destination

1
2
let destination = DownloadRequest.suggestedDownloadDestination(directory: .documentDirectory)
Alamofire.download("https://httpbin.org/image/png", to: destination)

Download Progress

1
2
3
4
5
6
7
8
9
Alamofire.download("https://httpbin.org/image/png")
    .downloadProgress { progress in
        print("Download Progress: \(progress.fractionCompleted)")
    }
    .responseData { response in
        if let data = response.result.value {
            let image = UIImage(data: data)
        }
    }

Download Progress with dispatchQueue

1
2
3
4
5
6
7
8
9
10
11
let utilityQueue = DispatchQueue.global(qos: .utility)

Alamofire.download("https://httpbin.org/image/png")
    .downloadProgress(queue: utilityQueue) { progress in
        print("Download Progress: \(progress.fractionCompleted)")
    }
    .responseData { response in
        if let data = response.result.value {
            let image = UIImage(data: data)
        }
    }

Resuming a Download

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
class ImageRequestor {
    private var resumeData: Data?
    private var image: UIImage?

    func fetchImage(completion: (UIImage?) -> Void) {
        guard image == nil else { completion(image) ; return }

        let destination: DownloadRequest.DownloadFileDestination = { _, _ in
            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            let fileURL = documentsURL.appendPathComponent("pig.png")

            return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
        }

        let request: DownloadRequest

        if let resumeData = resumeData {
            request = Alamofire.download(resumingWith: resumeData)
        } else {
            request = Alamofire.download("https://httpbin.org/image/png")
        }

        request.responseData { response in
            switch response.result {
            case .success(let data):
                self.image = UIImage(data: data)
            case .failure:
                self.resumeData = response.resumeData
            }
        }
    }
}

Bug

Xcode的bug: 从cocoapods导入时，识别不了Alamofire。只要先Run一次，再import Alamofire就可以了