Swift，swiftcode

Swift，swiftcode

Swift - UIView的無損

 

效果

 

源碼

////  UIView+ScreensShot.swift//  Swift-Animations////  Created by YouXianMing on 16/9/5.//  Copyright © 2016年 YouXianMing. All rights reserved.//import UIKitextension UIView {    /**     Get the view's screen shot, this function may be called from any thread of your app.          - returns: The screen shot's image.     */    func screenShot() -> UIImage? {                guard frame.size.height > 0 && frame.size.width > 0 else {                    return nil        }                UIGraphicsBeginImageContextWithOptions(frame.size, false, 0)        layer.renderInContext(UIGraphicsGetCurrentContext()!)        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()                return image    }}

 

使用

////  ViewController.swift//  ScreenShot////  Created by YouXianMing on 16/9/5.//  Copyright © 2016年 YouXianMing. All rights reserved.//import UIKitclass ViewController: UIViewController {    override func viewDidLoad() {                super.viewDidLoad()                let redView             = UIView(frame: CGRectMake(40, 40, 200, 200))        redView.backgroundColor = UIColor.redColor().colorWithAlphaComponent(0.5)        view.addSubview(redView)                let imageView = UIImageView(image: redView.screenShot())        view.addSubview(imageView)    }}