Image Picker Controller for iOS written in Swift 3.2 & 4

pod 'DKImagePickerController', :subspecs => ['PhotoGallery', 'Camera', 'InlineCamera']

let pickerController = DKImagePickerController()

pickerController.didSelectAssets = { (assets: [DKAsset]) in
    print("didSelectAssets")
    print(assets)
}

self.presentViewController(pickerController, animated: true) {}

​````

#### Configurations

​```swift
 /// Use UIDelegate to Customize the picker UI.
 @objc public var UIDelegate: DKImagePickerControllerBaseUIDelegate!
 
 /// Forces deselect of previous selected image. allowSwipeToSelect will be ignored.
 @objc public var singleSelect = false
 
 /// Auto close picker on single select
 @objc public var autoCloseOnSingleSelect = true
 
 /// The maximum count of assets which the user will be able to select, a value of 0 means no limit.
 @objc public var maxSelectableCount = 0
 
 /// Photos will be tagged with the location where they are taken.
 /// If true, your Info.plist should include the "Privacy - Location XXX" tag.
 open var containsGPSInMetadata = false
 
 /// Set the defaultAssetGroup to specify which album is the default asset group.
 public var defaultAssetGroup: PHAssetCollectionSubtype?
 
 /// Allow swipe to select images.
 @objc public var allowSwipeToSelect: Bool = false
 
 /// Allow select all
 @objc public var allowSelectAll: Bool = false
 
 /// A Bool value indicating whether the inline mode is enabled.
 @objc public var inline: Bool = false
 
 /// The type of picker interface to be displayed by the controller.
 @objc public var assetType: DKImagePickerControllerAssetType = .allAssets
 
 /// If sourceType is Camera will cause the assetType & maxSelectableCount & allowMultipleTypes & defaultSelectedAssets to be ignored.
 @objc public var sourceType: DKImagePickerControllerSourceType = .both
 
 /// A Bool value indicating whether allows to select photos and videos at the same time.
 @objc public var allowMultipleTypes = true
 
 /// A Bool value indicating whether to allow the picker auto-rotate the screen.
 @objc public var allowsLandscape = false
 
 /// Set the showsEmptyAlbums to specify whether or not the empty albums is shown in the picker.
 @objc public var showsEmptyAlbums = true
 
 /// A Bool value indicating whether to allow the picker shows the cancel button.
 @objc public var showsCancelButton = false
 
 /// The block is executed when the user presses the cancel button.
 @objc public var didCancel: (() -> Void)?
 
 /// The block is executed when the user presses the select button.
 @objc public var didSelectAssets: ((_ assets: [DKAsset]) -> Void)?
 
 /// The block is executed when the number of selected assets is changed.
 @objc public var selectedChanged: (() -> Void)?
 
 /// A Bool value indicating whether to allow the picker to auto-export the selected assets to the specified directory when done is called.
 /// picker will creating a default exporter if exportsWhenCompleted is true and the exporter is nil.
 @objc public var exportsWhenCompleted = false
 
 @objc public var exporter: DKImageAssetExporter?
 
 /// Indicates the status of the exporter.
 @objc public private(set) var exportStatus = DKImagePickerControllerExportStatus.none {
    willSet {
        if self.exportStatus != newValue {
            self.willChangeValue(forKey: #keyPath(DKImagePickerController.exportStatus))
        }
    }
    
    didSet {
        if self.exportStatus != oldValue {
            self.didChangeValue(forKey: #keyPath(DKImagePickerController.exportStatus))
            
            self.exportStatusChanged?(self.exportStatus)
        }
    }
 }
 
 /// The block is executed when the exportStatus is changed.
 @objc public var exportStatusChanged: ((DKImagePickerControllerExportStatus) -> Void)?
 
 /// The object that acts as the data source of the picker.
 @objc public private(set) lazy var groupDataManager: DKImageGroupDataManager

let groupDataManagerConfiguration = DKImageGroupDataManagerConfiguration()
groupDataManagerConfiguration.fetchLimit = 10
groupDataManagerConfiguration.assetGroupTypes = [.smartAlbumUserLibrary]

let groupDataManager = DKImageGroupDataManager(configuration: groupDataManagerConfiguration)

self.pickerController = DKImagePickerController(groupDataManager: groupDataManager)
pickerController.inline = true
pickerController.UIDelegate = CustomInlineLayoutUIDelegate(imagePickerController: pickerController)
pickerController.assetType = .allPhotos
pickerController.sourceType = .photo

let pickerView = self.pickerController.view!
pickerView.frame = CGRect(x: 0, y: 170, width: self.view.bounds.width, height: 200)
self.view.addSubview(pickerView)

UINavigationBar.appearance().titleTextAttributes = [
    NSFontAttributeName : UIFont(name: "Optima-BoldItalic", size: 21)!,
    NSForegroundColorAttributeName : UIColor.redColor()
]

/*
 Configuration options for a DKImageAssetExporter.  When an exporter is created,
 a copy of the configuration object is made - you cannot modify the configuration
 of an exporter after it has been created.
 */
@objc
public class DKImageAssetExporterConfiguration: NSObject, NSCopying {
    
    @objc public var imageExportPreset = DKImageExportPresent.compatible
    
    /// videoExportPreset can be used to specify the transcoding quality for videos (via a AVAssetExportPreset* string).
    @objc public var videoExportPreset = AVAssetExportPresetHighestQuality
    
    #if swift(>=4.0)
    @objc public var avOutputFileType = AVFileType.mov
    #else
    @objc public var avOutputFileType = AVFileTypeQuickTimeMovie
    #endif
    
    @objc public var exportDirectory = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("DKImageAssetExporter")
}

/*
 A DKImageAssetExporter object exports DKAsset(PHAsset) from album (or iCloud) to the app's tmp directory (by default).
 It automatically deletes the exported directories when it receives a UIApplicationWillTerminate notification.
 */
@objc
open class DKImageAssetExporter: DKBaseManager {
    
    /// This method starts an asynchronous export operation of a batch of asset.
    @discardableResult
    @objc public func exportAssetsAsynchronously(assets: [DKAsset], completion: ((_ info: [AnyHashable : Any]) -> Void)?) -> DKImageAssetExportRequestID
}

@objc
public enum DKImageExportPresent: Int {
    case
    compatible, // A preset for converting HEIF formatted images to JPEG.
    current     // A preset for passing image data as-is to the client.
}

@objc
public protocol DKImageAssetExporterObserver {
    
    @objc optional func exporterWillBeginExporting(exporter: DKImageAssetExporter, asset: DKAsset)
    
    /// The progress can be obtained from the DKAsset.
    @objc optional func exporterDidUpdateProgress(exporter: DKImageAssetExporter, asset: DKAsset)
    
    /// When the asset's error is not nil, it indicates that an error occurred while exporting.
    @objc optional func exporterDidEndExporting(exporter: DKImageAssetExporter, asset: DKAsset)
}

extension DKAsset {
    
    /// The exported file will be placed in this location.
    /// All exported files can be automatically cleaned by the DKImageAssetDiskPurger when appropriate.
    @objc public var localTemporaryPath: URL?
    
    @objc public var fileName: String?
    
    /// Indicates the file's size in bytes.
    @objc public var fileSize: UInt
        
    /// If you export an asset whose data is not on the local device, and you have enabled downloading with the isNetworkAccessAllowed property, the progress indicates the progress of the download. A value of 0.0 indicates that the download has just started, and a value of 1.0 indicates the download is complete.
    @objc public var progress: Double
    
    /// Describes the error that occurred if the export has failed or been cancelled.
    @objc public var error: Error?
}

/// Registers an extension for the specified type.
public class func registerExtension(extensionClass: DKImageBaseExtension.Type, for type: DKImageExtensionType)

public class func unregisterExtension(for type: DKImageExtensionType)

/// Starts the extension.
func perform(with extraInfo: [AnyHashable: Any])

/// Completes the extension.
func finish()

let didFinishCapturingImage = extraInfo["didFinishCapturingImage"] as? ((UIImage, [AnyHashable : Any]?) -> Void)
let didCancel = extraInfo["didCancel"] as? (() -> Void)

let groupId = extraInfo["groupId"] as? String
let presentationIndex = extraInfo["presentationIndex"] as? Int
let presentingFromImageView = extraInfo["presentingFromImageView"] as? UIImageView

let image = extraInfo["image"] as? UIImage
let didFinishEditing = extraInfo["didFinishEditing"] as? ((UIImage, [AnyHashable : Any]?) -> Void)
let metadata = extraInfo["metadata"] as? [AnyHashable : Any]

DKImagePickerController *pickerController = [DKImagePickerController new];

 [pickerController setDidSelectAssets:^(NSArray * __nonnull assets) {
     NSLog(@"didSelectAssets");
 }];
 
 [self presentViewController:pickerController animated:YES completion:nil];

DKImagePickerControllerResource.customLocalizationBlock = { title in
    if title == "picker.select.title" {
        return "Test(%@)"
    } else {
        return nil
    }
}

DKImagePickerControllerResource.customImageBlock = { imageName in
    if imageName == "camera" {
        return DKImagePickerControllerResource.photoGalleryCheckedImage()
    } else {
        return nil
    }
}