Error output from Xcode build:
↳
    2019-12-20 11:10:00.925 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> == Underlying device preparation errors ==
    2019-12-20 11:10:00.925 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> -- Failed _shouldMakeReadyForDevelopment check even though device is not locked by passcode.
    Domain: com.apple.platform.iphoneos
    Code: 5
    Failure Reason: allowsSecureServices: 1. isConnected: 0. Platform: <DVTPlatform:0x7fc942c3ef20:'com.apple.platform.iphoneos':<DVTFilePath:0x7fc942c3eea0:'/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform'>>. DTDKDeviceIdentifierIsIDID: 0
    --
    2019-12-20 11:10:00.925 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> == END: Underlying device preparation errors ==
    2019-12-20 11:10:01.487 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> == Underlying device preparation errors ==
    2019-12-20 11:10:01.487 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> -- Failed _shouldMakeReadyForDevelopment check even though device is not locked by passcode.
    Domain: com.apple.platform.iphoneos
    Code: 5
    Failure Reason: allowsSecureServices: 1. isConnected: 0. Platform: <DVTPlatform:0x7fc942c3ef20:'com.apple.platform.iphoneos':<DVTFilePath:0x7fc942c3eea0:'/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform'>>. DTDKDeviceIdentifierIsIDID: 0
    --
    2019-12-20 11:10:01.488 xcodebuild[76861:12042906] [MT] iPhoneConnect: 📱<DVTiOSDevice (0x7fc944b0dcc0), qiujie的 iPhone, iPhone, 13.1.3 (17A878), 7ce3d4082b95f0e10f4f00320e9623e44fd2e463> == END: Underlying device preparation errors ==
    ** BUILD FAILED **


Xcode's output:
↳
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:262:17: warning: instance method 'imagePickerController(_:didFinishPickingMediaWithInfo:)' nearly matches optional requirement 'imagePickerController(_:didFinishPickingMediaWithInfo:)' of protocol 'UIImagePickerControllerDelegate'
        public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
                    ^
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:262:17: note: candidate has non-matching type '(UIImagePickerController, [UIImagePickerController.InfoKey : Any]) -> ()' (aka '(UIImagePickerController, Dictionary<NSString, Any>) -> ()')
        public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
                    ^
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:262:17: note: move 'imagePickerController(_:didFinishPickingMediaWithInfo:)' to an extension to silence this warning
        public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
                    ^
    UIKit.UIImagePickerControllerDelegate:8:19: note: requirement 'imagePickerController(_:didFinishPickingMediaWithInfo:)' declared here
        optional func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
                      ^
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:236:35: error: 'jpegData(compressionQuality:)' has been renamed to 'UIImageJPEGRepresentation(_:_:)'
                        data = image?.jpegData(compressionQuality: 100) ?? nil
                                      ^~~~~~~~
                                      UIImageJPEGRepresentation
    UIKit.UIImage:60:17: note: 'jpegData(compressionQuality:)' was introduced in Swift 4.2
        public func jpegData(compressionQuality: CGFloat) -> Data?
                    ^
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:263:42: warning: cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'String' always fails
            let mediaType = info[.mediaType] as! String;
                            ~~~~~~~~~~~~~~~~ ^   ~~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:263:29: error: ambiguous reference to member 'subscript'
            let mediaType = info[.mediaType] as! String;
                            ~~~~^~~~~~~~~~~~
    Swift.Dictionary<τ_0_0, τ_0_1>:8:23: note: found this candidate
        @inlinable public subscript(position: Dictionary<Key, Value>.Index) -> [Key : Value].Element { get }
                          ^
    Swift.Dictionary<τ_0_0, τ_0_1>:2:23: note: found this candidate
        @inlinable public subscript(key: Key) -> Value? { get set }
                          ^
    Swift.Dictionary<τ_0_0, τ_0_1>:2:23: note: found this candidate
        @inlinable public subscript(key: Key, default defaultValue: @autoclosure () -> Value) -> Value { get set }
                          ^
    Swift.Collection:2:23: note: found this candidate
        @inlinable public subscript(bounds: Range<Self.Index>) -> Slice<Self> { get }
                          ^
    Swift.Collection:2:23: note: found this candidate
        @inlinable public subscript<R>(r: R) -> Self.SubSequence where R : RangeExpression, Self.Index == R.Bound { get }
                          ^
    Swift.Collection:3:23: note: found this candidate
        @inlinable public subscript(x: (UnboundedRange_) -> ()) -> Self.SubSequence { get }
                          ^
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:265:56: warning: cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'UIImage' always fails
                let image:UIImage?  = info[.originalImage] as? UIImage;
                                      ~~~~~~~~~~~~~~~~~~~~ ^   ~~~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:265:56: warning: cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'UIImage' always fails
                let image:UIImage?  = info[.originalImage] as? UIImage;
                                      ~~~~~~~~~~~~~~~~~~~~ ^   ~~~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:265:56: error: 'UIImage?' is not convertible to 'UIImage'
                let image:UIImage?  = info[.originalImage] as? UIImage;
                                      ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:274:51: warning: cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'NSURL' always fails
                let videoUrl:NSURL? = info[.mediaURL] as? NSURL;
                                      ~~~~~~~~~~~~~~~ ^   ~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:274:51: warning: cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'NSURL' always fails
                let videoUrl:NSURL? = info[.mediaURL] as? NSURL;
                                      ~~~~~~~~~~~~~~~ ^   ~~~~~
    /Users/tian/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.4.2/ios/Classes/SwiftImagePickerFlutterPlugin.swift:274:51: error: 'NSURL?' is not convertible to 'NSURL'
                let videoUrl:NSURL? = info[.mediaURL] as? NSURL;

/Users/hjc1/.pub-cache/hosted/pub.flutter-io.cn/image_picker_flutter-1.3.1/ios/Classes/ImagePickerFlutterPlugin.m:2:9: fatal error: 'image_picker_flutter/image_picker_flutter-Swift.h' file not found #import <image_picker_flutter/image_picker_flutter-Swift.h>

AndroidManifest.xml uses android:name="io.flutter.app.FlutterApplication" ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Build failed due to use of deprecated Android v1 embedding.

Your library is awesome, it's very nice and complete

However there is a small problem here: For devices with a large number of images, the load time of screen image selection is very large.