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
