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Extension For change UIImage. This is useful for set highlighted image for UIButton.
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| // | |
| // UIImage+Extension.swift | |
| // | |
| // Created by Yukito Shibuya on 2016/10/08. | |
| // Copyright © 2016年 yukitoto. All rights reserved. | |
| // | |
| import UIKit | |
| extension UIImage { | |
| func imageWithAlphaComponent(alpha: CGFloat) -> UIImage { | |
| UIGraphicsBeginImageContextWithOptions(self.size, false, 0) | |
| let ctx = UIGraphicsGetCurrentContext() | |
| let area = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height) | |
| CGContextScaleCTM(ctx, 1, -1) | |
| CGContextTranslateCTM(ctx, 0, -area.size.height) | |
| CGContextSetBlendMode(ctx, CGBlendMode.Multiply) | |
| CGContextSetAlpha(ctx, alpha) | |
| CGContextDrawImage(ctx, area, self.CGImage) | |
| let newImage = UIGraphicsGetImageFromCurrentImageContext() | |
| UIGraphicsEndImageContext() | |
| return newImage | |
| } | |
| } |
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This is amazing!!! Thank you 👍