• Generate pictures based on color
  • Binary compression

code

import Foundation
import UIKit


extension UIImage {
    
    /// generate images based on color
    /// - Parameters:
    /// -color: color
    / / / - width: the width
    / / / - height: high
    /// - Returns: images
    class func imageFromeColor(color: UIColor.width: CGFloat.height: CGFloat) - >UIImage{
        let rect = CGRect.init(x: 0.0, y: 0.0, width: width, height: height)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        context?.setFillColor(color.cgColor)
        context?.fill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext(a)UIGraphicsEndImageContext(a)return image!
    }
    
    /// generate images based on color
    /// - Parameters:
    /// -color: color
    /// -viewsize: size
    /// - Returns: images
    class func imageFromColor(color: UIColor.viewSize: CGSize) - >UIImage{

           let rect: CGRect = CGRect(x: 0, y: 0, width: viewSize.width, height: viewSize.height)
           UIGraphicsBeginImageContext(rect.size)
           let context: CGContext = UIGraphicsGetCurrentContext(a)!
           context.setFillColor(color.cgColor)
           context.fill(rect)
           let image = UIGraphicsGetImageFromCurrentImageContext(a)UIGraphicsGetCurrentContext(a)return image!

       }
    
    
    /// binary compression
    /// -parameter maxLength: specifies the maximum value of the Parameter.
    /// - Returns: compressed image
     func compressImageMid(maxLength: Int) -> UIImage? {
            var compression: CGFloat = 1
        guard var data = self.jpegData(compressionQuality: 1) else { return nil }
            print("Before compression KB:\( Double((data.count)/1024))")
            if data.count < maxLength {
                return self
            }
            print("Pre-compression KB", data.count / 1024."KB")
            var max: CGFloat = 1
            var min: CGFloat = 0
            for _ in 0..<6 {
                compression = (max + min) / 2
                data = self.jpegData(compressionQuality: compression)!
                if CGFloat(data.count) < CGFloat(maxLength) * 0.9 {
                    min = compression
                } else if data.count > maxLength {
                    max = compression
                } else {
                    break}}print("Compressed KB", data.count / 1024."KB")
        let resultImage: UIImage = UIImage(data: data)!
        return resultImage
     }
    
    
}

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Demo: Github