我正试图将以下代码行添加到我的Flutter应用程序的AppDelegate.swift文件中，因为我使用的是AmazonS3，您可以在这里阅读有关此配置的信息-https://pub.dev/packages/amazon_s3_cognito#ios
func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
// Store the completion handler.
AWSS3TransferUtility.interceptApplication(application, handleEventsForBackgroundURLSession: identifier, completionHandler: completionHandler)
}
下面是我的代码
import UIKit
import Flutter
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
// Store the completion handler.
AWSS3TransferUtility.interceptApplication(application, handleEventsForBackgroundURLSession: identifier, completionHandler: completionHandler)
}
}
然而，这给我带来了以下错误。
Launching lib/main.dart on iPhone 13 in debug mode...
Xcode build done. 10.4s
Failed to build iOS app
Error output from Xcode build:
↳
objc[28776]: Class AMSupportURLConnectionDelegate is implemented in both /usr/lib/libauthinstall.dylib (0x20d9bab90) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x105f9c2c8). One of the two will be used. Which one is undefined.
objc[28776]: Class AMSupportURLSession is implemented in both /usr/lib/libauthinstall.dylib (0x20d9babe0) and /Library/Apple/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x105f9c318). One of the two will be used. Which one is undefined.
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Any iOS Simulator Device }
{ platform:iOS Simulator, id:1ABD0743-E247-4003-A707-FF32B0D919CC, OS:15.2, name:iPad (9th generation) }
{ platform:iOS Simulator, id:0C55A691-D2B7-41C0-931C-3FA45254EBEE, OS:15.2, name:iPad Air (4th generation) }
{ platform:iOS Simulator, id:D6A98800-F0AC-479B-8296-AED806661D77, OS:15.2, name:iPad Pro (9.7-inch) }
{ platform:iOS Simulator, id:AEB0F448-88CF-46BA-B7F2-86F73FC2D06A, OS:15.2, name:iPad Pro (11-inch) (3rd generation) }
{ platform:iOS Simulator, id:640C9AB6-6852-4F25-A598-414D44F36708, OS:15.2, name:iPad Pro (12.9-inch) (5th generation) }
{ platform:iOS Simulator, id:C45E1FFD-A4B1-4E69-9D41-EF52944DCFF6, OS:15.2, name:iPad mini (6th generation) }
{ platform:iOS Simulator, id:C3118792-4E05-4971-9E70-97E8BEF2AF8E, OS:15.2, name:iPhone 8 }
{ platform:iOS Simulator, id:C87519E9-C754-49BE-A0BE-BCEA9D823C8F, OS:15.2, name:iPhone 8 Plus }
{ platform:iOS Simulator, id:5E7237C4-7239-446D-AA20-97625673CCA5, OS:15.2, name:iPhone 11 }
{ platform:iOS Simulator, id:4F0B2537-04B5-4ED8-90F0-076C819A5783, OS:15.2, name:iPhone 11 Pro }
{ platform:iOS Simulator, id:272A8C28-47BC-46B9-8B2F-6DD5B3B561CE, OS:15.2, name:iPhone 11 Pro Max }
{ platform:iOS Simulator, id:F965B511-D3F6-428D-BC40-4B3C620B5720, OS:15.2, name:iPhone 12 }
{ platform:iOS Simulator, id:114A3386-66D5-4C36-BDB5-574FE1C07067, OS:15.2, name:iPhone 12 Pro }
{ platform:iOS Simulator, id:155E2EF9-E9AD-4F74-A7F9-A9702A708080, OS:15.2, name:iPhone 12 Pro Max }
{ platform:iOS Simulator, id:D7D7C57E-25D2-4A6F-8956-442EB0DD524F, OS:15.2, name:iPhone 12 mini }
{ platform:iOS Simulator, id:3C432DFA-3D27-472F-AF97-A71AC22DC5DA, OS:15.2, name:iPhone 13 }
{ platform:iOS Simulator, id:58F3389A-38B0-42F0-8A0A-8D7279D14D55, OS:15.2, name:iPhone 13 Pro }
{ platform:iOS Simulator, id:9C77C570-7653-40BE-B18D-1E9ECF0A0162, OS:15.2, name:iPhone 13 Pro Max }
{ platform:iOS Simulator, id:FAF7A709-FC97-4445-A8ED-478ED5972DF6, OS:15.2, name:iPhone 13 mini }
{ platform:iOS Simulator, id:7D146971-E6B4-4CA0-AB3A-4F41DDB5E59F, OS:15.2, name:iPhone SE (2nd generation) }
{ platform:iOS Simulator, id:F293BCDE-386F-4AF8-B3CE-91F0E96C253B, OS:15.2, name:iPod touch (7th generation) }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:00008103-001978AE1ADA001E }
{ platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device }
** BUILD FAILED **
Xcode's output:
↳
/Users/xxxwxxx/Documents/projects/flutter/xxx/xxx-customer/ios/Runner/AppDelegate.swift:13:8: error: overriding declaration requires an 'override' keyword
func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
^
override
Flutter.FlutterAppDelegate:71:15: note: overridden declaration is here
open func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void)
^
/Users/xxxwxxx/Documents/projects/flutter/xxx/xxx-customer/ios/Runner/AppDelegate.swift:15:5: error: cannot find 'AWSS3TransferUtility' in scope
AWSS3TransferUtility.interceptApplication(application, handleEventsForBackgroundURLSession: identifier, completionHandler: completionHandler)
^~~~~~~~~~~~~~~~~~~~
note: Using new build system
note: Planning
note: Build preparation complete
note: Building targets in dependency order
/Users/xxxwxxx/Documents/projects/flutter/xxx/xxx-customer/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'FMDB' from project 'Pods')
/Users/xxxwxxx/Documents/projects/flutter/xxx/xxx-customer/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'BSImageView' from project 'Pods')
/Users/xxxwxxx/Documents/projects/flutter/xxx/xxx-customer/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'BSGridCollectionViewLayout' from project 'Pods')
Could not build the application for the simulator.
Error launching application on iPhone 13.
Exited (sigterm)
我必须承认，我缺乏原生iOS开发知识。这里出了什么问题？
您有两个应用程序方法，第二个方法应该重写如下
import UIKit
import Flutter
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
override func application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) {
// Store the completion handler.
AWSS3TransferUtility.interceptApplication(application, handleEventsForBackgroundURLSession: identifier, completionHandler: completionHandler)
}
}