61 To get the UIImage from UIView (screenshot)

Swift3.0 // // ViewController.swift // UIKit061 // // Created by Misato Morino on 2016/08/15. // Copyright © 2016年 Misato Morino. All rights reserved. // import UIKit extension UIView { func GetImage() -> UIImage{ // キャプチャする範囲を取得. let rect = self.bounds // ビットマップ画像のcontextを作成. UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0) let context: CGContext = UIGraphicsGetCurrentContext()! // 対象のview内の描画をcontextに複写する. self.layer.render(in: context) // 現在のcontextのビットマップをUIImageとして取得. let capturedImage : UIImage = UIGraphicsGetImageFromCurrentImageContext()! // contextを閉じる. UIGraphicsEndImageContext() return capturedImage } } class ViewController: UIViewController { var myLabel: UILabel! var myImageView: UIImageView! override func viewDidLoad() { // Labelを生成. myLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 100)) myLabel.text = "test" myLabel.textColor = UIColor.white myLabel.layer.cornerRadius = 50.0 myLabel.layer.masksToBounds = true myLabel.backgroundColor = UIColor.blue myLabel.textAlignment = NSTextAlignment.center myLabel.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height/2 - 100) // ImageViewを生成. myImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 150, height: 150)) myImageView.layer.borderColor = UIColor.black.cgColor myImageView.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height - 200) myImageView.layer.borderWidth = 0.5 // Buttonを生成. let myButton = UIButton(frame: CGRect(x: 0, y: 0, width: 50, height: 20)) myButton.setTitle("push", for: UIControlState.normal) myButton.setTitleColor(UIColor.blue, for: UIControlState.normal) myButton.addTarget(self, action: #selector(ViewController.onClickMyButton(sender:)), for: UIControlEvents.touchUpInside) myButton.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height - 50) // viewにそれぞれを追加. self.view.addSubview(myLabel) self.view.addSubview(myImageView) self.view.addSubview(myButton) } /* Buttonが押された時に呼ばれるメソッド. */ func onClickMyButton(sender: UIButton) { // キャプチャ画像を取得. let myImage = myLabel.GetImage() as UIImage // ImageViewのimageにセット. myImageView.image = myImage // 縦横比率を保ちつつ画像をUIImageViewの大きさに合わせる. myImageView.contentMode = UIViewContentMode.scaleAspectFit } } Swift 2.3 // // ViewController.swift // UIKit061 // // Created by Misato Morino on 2016/08/15. // Copyright © 2016年 Misato Morino. All rights reserved. // import UIKit extension UIView { func GetImage() -> UIImage{ // キャプチャする範囲を取得. let rect = self.bounds // ビットマップ画像のcontextを作成. UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0) let context: CGContextRef = UIGraphicsGetCurrentContext()! // 対象のview内の描画をcontextに複写する. self.layer.renderInContext(context) // 現在のcontextのビットマップをUIImageとして取得. let capturedImage : UIImage = UIGraphicsGetImageFromCurrentImageContext() // contextを閉じる. UIGraphicsEndImageContext() return capturedImage } } class ViewController: UIViewController { var myLabel: UILabel! var myImageView: UIImageView! override func viewDidLoad() { // Labelを生成. myLabel = UILabel(frame: CGRectMake(0, 0, 100, 100)) myLabel.text = "test" myLabel.textColor = UIColor.whiteColor() myLabel.layer.cornerRadius = 50.0 myLabel.layer.masksToBounds = true myLabel.backgroundColor = UIColor.blueColor() myLabel.textAlignment = NSTextAlignment.Center myLabel.layer.position = CGPointMake(self.view.frame.width/2, self.view.frame.height/2 - 100) // ImageViewを生成. myImageView = UIImageView(frame: CGRectMake(0, 0, 150, 150)) myImageView.layer.borderColor = UIColor.blackColor().CGColor myImageView.layer.position = CGPointMake(self.view.frame.width/2, self.view.frame.height - 200) myImageView.layer.borderWidth = 0.5 // Buttonを生成. let myButton = UIButton(frame: CGRectMake(0, 0, 50, 20)) myButton.setTitle("push", forState: UIControlState.Normal) myButton.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal) myButton.addTarget(self, action: #selector(ViewController.onClickMyButton(_:)), forControlEvents: UIControlEvents.TouchUpInside) myButton.layer.position = CGPointMake(self.view.frame.width/2, self.view.frame.height - 50) // viewにそれぞれを追加. self.view.addSubview(myLabel) self.view.addSubview(myImageView) self.view.addSubview(myButton) } /* Buttonが押された時に呼ばれるメソッド. */ func onClickMyButton(sender: UIButton) { // キャプチャ画像を取得. let myImage = myLabel.GetImage() as UIImage // ImageViewのimageにセット. myImageView.image = myImage // 縦横比率を保ちつつ画像をUIImageViewの大きさに合わせる. myImageView.contentMode = UIViewContentMode.ScaleAspectFit } } 2.3と3.0の差分 CGRectMakeが廃止 CGContextRef ではなく CGContext を使う