獲取iOS/swift中當前屏幕的截圖

Question

我想在手機上啓用一個功能，允許用戶單擊共享，然後他們將能夠給他們的朋友發短信，該信息默認包含該應用程序（就在用戶點擊共享之前）。我無法弄清楚如何做到這一點 - 每當我搜索如何做到這一點時，我所得到的都是關於如何在手機照片庫或相機中共享圖像的教程/答案。任何想法如何做到這一點！

Answer 1

//從截圖創建圖像

UIGraphicsBeginImageContext(view.frame.size) 
view.layer.renderInContext(UIGraphicsGetCurrentContext()) 
let image = UIGraphicsGetImageFromCurrentImageContext() 
UIGraphicsEndImageContext() 

//共享圖像

var imagesToShare = [AnyObject]() 
imagesToShare.append(image) 

let activityViewController = UIActivityViewController(activityItems: imagesToShare , applicationActivities: nil) 
activityViewController.popoverPresentationController?.sourceView = self.view 
presentViewController(activityViewController, animated: true, completion: nil) 

Answer 2

UIGraphicsBeginImageContext(self.view.bounds.size) 
self.view.drawHierarchy(in: view.bounds, afterScreenUpdates: false) 
let image = UIGraphicsGetImageFromCurrentImageContext() 
UIGraphicsEndImageContext() 

Answer 3

共享您的屏幕用戶點擊分享之前，首先你會需要將屏幕視圖更改爲圖像並共享。

要將您的視圖更改爲圖像，您可以在代碼中添加此擴展名。

//UIView extension which converts the UIView into an image. 
extension UIView { 
    func toImage() -> UIImage { 
     UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.mainScreen().scale) 

     drawViewHierarchyInRect(self.bounds, afterScreenUpdates: true) 

     let image = UIGraphicsGetImageFromCurrentImageContext() 
     UIGraphicsEndImageContext() 
     return image 
    } 
} 

通過你的ViewController的觀點有，例如：

let imageToShare = self.view.toImage() 

    let activityItems : NSMutableArray = []() 
     activityItems.addObject(imageToShare) 


    let activityVC = UIActivityViewController(activityItems:activityItems as [AnyObject] , applicationActivities: nil) 
       self.presentViewController(activityVC, animated: true, completion: nil) 

我希望這可以幫助你。