在swift中截取Textfield的截图？

Question

制作iOS应用程序，捕获填充了某些图像的textview的屏幕截图。问题是屏幕截图捕获整个屏幕。 如何使用Swift拍摄UITextView的屏幕截图？

Answer 1

您可以使用drawViewHierarchyInRect方法

将任何视图保存为图像

UIGraphicsBeginImageContextWithOptions(self.textView.bounds.size, false, 0);
self.textText.drawViewHierarchyInRect(CGRectMake(0, 0, self.textView.frame.size.width, self.textView.frame.size.height),afterScreenUpdates:true)
var screenShot:UIImage = UIGraphicsGetImageFromCurrentImageContext();

Answer 2

以下为我工作

UIGraphicsBeginImageContextWithOptions(self.textField.bounds.size, false, 0);
self.textField.drawViewHierarchyInRect(self.textField.bounds, afterScreenUpdates: true)
let copied = UIGraphicsGetImageFromCurrentImageContext();
imageView.image = copied
UIGraphicsEndImageContext();

Answer 3

所有答案都很好，但遗失的是scale necessary context。

使用UIView's drawViewHierarchyInRect mehtod捕获屏幕。

//Use screen scale for better images
let screenScale = UIScreen.mainScreen().scale;
//create context 
UIGraphicsBeginImageContextWithOptions(yourView.bounds.size, false, screenScale);
//use view for drawing
yourView.drawViewHierarchyInRect(yourView.bounds, afterScreenUpdates: true)
//get captured image
let capturedImage = UIGraphicsGetImageFromCurrentImageContext();
//last dump context
UIGraphicsEndImageContext();

另一个诽谤：使用UIView's layer's renderInContext

//Use screen scale for better images
let screenScale = UIScreen.mainScreen().scale;
//create context 
UIGraphicsBeginImageContextWithOptions(yourView.bounds.size, false, screenScale);
//use view for drawing
yourView.layer.renderInContext(UIGraphicsGetCurrentContext())
//get captured image
let capturedImage = UIGraphicsGetImageFromCurrentImageContext();
//last dump context
UIGraphicsEndImageContext();