拍摄整个视图的屏幕快照(swift3)

Question

我只想用一个按钮拍摄整个视图控制器的照片。我想我要做的是拍摄一张uiview的屏幕截图，并保存在照片库中。我要照片上的按钮。

    import UIKit

class ViewController: UIViewController {

    @IBOutlet var x: UIButton!
    var screenShot: UIImage?
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
              }

    func saveScreen() {
        self.screenShot = screenshot()
        print("cool")
    }

    func screenshot() -> UIImage {
        let imageSize = UIScreen.main.bounds.size as CGSize;
        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
        let context = UIGraphicsGetCurrentContext()
        for obj : AnyObject in UIApplication.shared.windows {
            if let window = obj as? UIWindow {
                if window.responds(to: #selector(getter: UIWindow.screen)) || window.screen == UIScreen.main {
                    // so we must first apply the layer's geometry to the graphics context
                    context!.saveGState();
                    // Center the context around the window's anchor point
                    context!.translateBy(x: window.center.x, y: window.center
                        .y);
                    // Apply the window's transform about the anchor point
                    context!.concatenate(window.transform);
                    // Offset by the portion of the bounds left of and above the anchor point
                    context!.translateBy(x: -window.bounds.size.width * window.layer.anchorPoint.x,
                                         y: -window.bounds.size.height * window.layer.anchorPoint.y);

                    // Render the layer hierarchy to the current context
                    window.layer.render(in: context!)

                    // Restore the context
                    context!.restoreGState();
                }
            }
        }
        let image = UIGraphicsGetImageFromCurrentImageContext();
        return image!
    }
    @IBAction func saveUIVIEW(_ sender: Any) {
        self.screenShot = screenshot()
    }

}

​

​

Answer 1

用这个代码。原来的答案在这里。Screenshot on swift programmatically

UIGraphicsBeginImageContextWithOptions(imageSize，-> UIImage ()->UIImage{ let imageSize = UIScreen.main.bounds.size as CGSize；UIScreen.main.bounds.size false，0) let context = UIGraphicsGetCurrentContext() for obj : AnyObject in UIApplication.shared.windows { if imageSize= obj as？UIWindow { if window.responds( to：#selector(getter: UIWindow.screen)) { //所以我们必须首先将图层的几何结构应用于图形上下文！.saveGState()；//将上下文围绕在窗口的锚点上下文！.translateBy(x:window.cent.x，y: window.center .y)；//应用窗口对锚点上下文的转换！.concatenate(window.transform)；.translateBy(x：-window.bounds.size.width * window.layer.anchorPoint.x，y：-window.bounds.size.height * window.layer.anchorPoint.y)；//将图层层次结构呈现给当前上下文window.layer.render(在: context!) //还原上下文！.restoreGState()；}} let = UIGraphicsGetImageFromCurrentImageContext()；返回图像！}

呼叫：

func saveScreen() {
    let image = screenshot()
    UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}

func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    if let error = error {
        // we got back an error!
        let ac = UIAlertController(title: "Save error", message: error.localizedDescription, preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    } else {
        let ac = UIAlertController(title: "Saved!", message: "Your altered image has been saved to your photos.", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }
}

@IBAction func saveUIVIEW(_ sender: Any) {
    saveScreen()
}