paiai_ios/PaiAi/PaiaiUIKit/Reusable/Extension/UIKit/UIImageExt.swift

//
//  UIImageExt.swift
//  PaiaiUIKit
//
//  Created by FFIB on 2017/9/14.
//  Copyright © 2017年 FFIB. All rights reserved.
//

import UIKit

public extension UIImage {

    func scaledImage(_ scale: CGFloat) -> UIImage? {
        let outputSize = size * scale
        let renderer = UIGraphicsImageRenderer(size: outputSize)
        return renderer.image(actions: {_ in })
    }

    func scaledImage(length: CGFloat, with quality: CGFloat) -> Data? {
        let edge = size.width > size.height ? size.height : size.width
        let outputSize = size * (length / edge)
        let renderer = UIGraphicsImageRenderer(size: outputSize)
        return renderer.jpegData(withCompressionQuality: quality) { _ in
            let content = UIGraphicsGetCurrentContext()
            content?.draw(cgImage!, in: CGRect(origin: CGPoint.zero, size: outputSize))
        }
    }
    
    func combineTo(image: UIImage, proportion: CGFloat, size: CGSize) {
        let renderer = UIGraphicsImageRenderer(size: size)
        renderer.image(actions: { context in
            context.currentImage.draw(in: CGRect.init(x: 0, y: 0, width: size.width * proportion, height: size.height))
            image.draw(in: CGRect.init(x: size.width * proportion, y: 0, width: size.width * (1 - proportion), height: size.height))
        })
    }
}

public extension UIImage {
    static var defaultAvatar: UIImage? {
        return UIImage(named: "defaultAvatar")
    }

    static var photoPlaceholder: UIImage? {
        return UIImage(named: "photoPlaceholder")
    }

    struct Navigation {
        public static var background: UIImage? {
            return UIImage(named: "navigation-background")?.resizableImage(withCapInsets: UIEdgeInsets.zero,
                                                                           resizingMode: .stretch)
        }

        public static var blackBackground: UIImage? {
            return UIImage(named: "navigation-background-black")?.resizableImage(withCapInsets: UIEdgeInsets.zero,
                                                                                 resizingMode: .stretch)
        }

        public static var right: UIImage? {
            return UIImage(named: "navigation-right")?.resizableImage(withCapInsets: UIEdgeInsets.zero,
                                                                      resizingMode: .stretch)
        }

        public static var verticalPoints: UIImage? {
            return UIImage(named: "navigation-vertical-points")?.resizableImage(withCapInsets: UIEdgeInsets.zero,
                                                                                resizingMode: .stretch)
        }
    }

    struct PhotoDetail {
        public static var purchaseBackground: UIImage? {
            return UIImage(named: "purchase-background")?.resizableImage(withCapInsets: UIEdgeInsets.zero,
                                                                         resizingMode: .stretch)
        }
    }
}