ios – 我正在将数据从我的Swift应用程序上传到Amazon S3,它就像其他任何东西一样耗尽电池.如何避免这种情况？

在我的’ Swift‘应用程序中,我有一个将照片上传到我的Amazon S3存储桶的功能.当用户连接到WiFi或LTE时,没有问题,但是当连接速度稍慢(例如3G)时,上传需要花费很多时间(最多一分钟),iphone可能会损失15-20％电池！我将照片调整到大约200-300kb,这应该不是问题.我用的代码是：

func awsS3PhotoUploader(_ ext: String,pathToFile: String,contentType: String,automaticUpload: Bool){

        let credentialsProvider = AWSCognitoCredentialsProvider(regionType:CognitoRegionType,identityPoolId:CognitoIdentityPoolId)
        let configuration = AWSServiceConfiguration(region:CognitoRegionType,credentialsProvider:credentialsProvider)
        AWSServiceManager.default().defaultServiceConfiguration = configuration

        let uploadRequest = AWSS3TransferManagerUploadRequest()
        uploadRequest?.body = URL(string: "file://"+pathToFile)
        uploadRequest?.key = ProcessInfo.processInfo.globallyUniqueString + "." + ext
        uploadRequest?.bucket = S3BucketName
        uploadRequest?.contentType = contentType + ext

        uploadRequest?.uploadProgress = { (bytesSent,totalBytesSent,totalBytesExpectedToSend) -> Void in
            DispatchQueue.main.async(execute: { () -> Void in
                if totalBytesExpectedToSend > 1 {
                    print(totalBytesSent)
                    print(totalBytesExpectedToSend)
                }
            })
        }
        let transferManager = AWSS3TransferManager.default()
        transferManager?.upload(uploadRequest).continue({ (task) -> AnyObject! in

            if (task.isCompleted) {
                  print("task completed")
            }

            if let error = task.error {
                 print("Upload failed ❌ (\(error))")

            }
            if let exception = task.exception {
                 print("Upload failed ❌ (\(exception))")

            }
            if task.result != nil {
                let s3URL: String = "https://myAlias.cloudfront.net/\((uploadRequest?.key!)!)"
                print("Uploaded to:\n\(s3URL)")
            }
            else {
                print("Unexpected empty result.")
            }
            return nil
        }
        )

}

有什么事情让你想到我在这里做错了什么？如何避免这种巨大的电池消耗？

解决方法

以下答案的灵感来自 https://stackoverflow.com/a/20690088/3549695

我相信你需要做的是能够检测无线电网络的类型.无论是WiFi,LTE,3G,2G还是无网络.
然后,应用程序将需要根据结果做出决定.

我创建了一个测试Xcode项目来测试我的iPhone 6上的这个概念.
它似乎工作,但我只能测试’空中飞机模式’,WiFi和LTE.我不能让自己进入2G或3G网络.

如果是WiFi或LTE,我将获得价值：
‘CTRadioAccessTechnologyLTE’

在“Air Plane Mode”中,Optional值为零.因此,由我来取代它的文本取决于我.我选择输出’无法检测’

这是我的ViewController.swift的样子：

import UIKit
import CoreTelephony

class ViewController: UIViewController {

    @IBOutlet weak var currentRAN: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.

    }

    @IBAction func detect(_ sender: UIButton) {
        if case let telephonyInfo = CTTelephonyNetworkInfo(),let currentRadioAccessTech = telephonyInfo.currentRadioAccessTechnology {

            currentRAN.text = currentRadioAccessTech
            print("Current Radio Access Technology: \(currentRadioAccessTech)")

        } else {
            currentRAN.text = "Not able to detect"
            print("Not able to detect")
        }
    }
}

.currentRadioAccessTechnology的可能值为：

/*
* Radio Access Technology values
*/
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyGPRS: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyEdge: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyWCDMA: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyHSDPA: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyHSUPA: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyCDMA1x: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyCDMAEVDORev0: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyCDMAEVDORevA: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyCDMAEVDORevB: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyeHRPD: String
@available(iOS 7.0,*)
public let CTRadioAccessTechnologyLTE: String