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UIImagePickerController+LambdaKit.swift
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UIImagePickerController+LambdaKit.swift
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//
// UIImagePickerController+LamdaKit.swift
// Created by Martin Conte Mac Donell on 3/31/15.
//
// Copyright (c) 2015 Lyft (http://lyft.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import Foundation
import UIKit
public typealias LKFinishPickingMediaClosure = (UIImagePickerController, [AnyHashable: Any]) -> Void
public typealias LKCancelClosure = (UIImagePickerController) -> Void
// A global var to produce a unique address for the assoc object handle
private var associatedEventHandle: UInt8 = 0
/// UIImagePickerController with closure callback(s).
///
/// Example:
///
/// ```swift
/// let picker = UIImagePickerController()
/// picker.didCancel = { picker in
/// print("DID CANCEL! \(picker)")
/// }
/// picker.didFinishPickingMedia = { picker, media in
/// print("Media: \(media[UIImagePickerControllerEditedImage])")
/// }
/// self.presentViewController(picker, animated: true, completion: nil)
/// ```
extension UIImagePickerController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
private var closuresWrapper: ClosuresWrapper {
get {
if let wrapper = objc_getAssociatedObject(self, &associatedEventHandle) as? ClosuresWrapper {
return wrapper
}
let closuresWrapper = ClosuresWrapper()
self.closuresWrapper = closuresWrapper
return closuresWrapper
}
set {
self.delegate = self
objc_setAssociatedObject(self, &associatedEventHandle, newValue,
objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
/// The closure that fires after the receiver finished picking up an image.
public var didFinishPickingMedia: LKFinishPickingMediaClosure? {
set { self.closuresWrapper.didFinishPickingMedia = newValue }
get { return self.closuresWrapper.didFinishPickingMedia }
}
/// The closure that fires after the user cancels out of picker.
public var didCancel: LKCancelClosure? {
set { self.closuresWrapper.didCancel = newValue }
get { return self.closuresWrapper.didCancel }
}
// MARK: UIImagePickerControllerDelegate implementation
open func imagePickerController(_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String : Any])
{
self.closuresWrapper.didFinishPickingMedia?(picker, info)
}
open func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.closuresWrapper.didCancel?(picker)
}
}
// MARK: - Private classes
fileprivate final class ClosuresWrapper {
fileprivate var didFinishPickingMedia: LKFinishPickingMediaClosure?
fileprivate var didCancel: LKCancelClosure?
}