在Swift中将UIView转换为.png格式

Question

我该如何将UIView转换为图像？我发现这个将uiview转换为.png图像，但我不太熟悉Objective-C。我试着用Swift将其翻译，但效果不佳。有人能帮忙吗？

UIGraphicsBeginImageContext(myView.frame.size);
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data=UIImagePNGRepresentation(viewImage);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *strPath = [documentsDirectory stringByAppendingPathComponent:@"myimage.png"];
[data writeToFile:strPath atomically:YES];

- Pablo Picasso

Answer 1

试试这个：

UIGraphicsBeginImageContextWithOptions(myView.layer.frame.size, false, scale)
myView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let viewImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
let data = UIImagePNGRepresentation(viewImage)
let documentsDir = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! String
let writePath = documentsDir.stringByAppendingPathComponent("myimage.png")
data.writeToFile(writePath, atomically:true)

- Andrea

Answer 2

Swift 5版本：

UIGraphicsBeginImageContextWithOptions(myView.layer.frame.size, false, 1) // 1 = scale
myView.layer.render(in: UIGraphicsGetCurrentContext()!)
let viewImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let documentsDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let writePath = documentsDir.appendingPathComponent("Image.png")
try! viewImage!.pngData()!.write(to: writePath)
print("Saved image to:" writePath)

- jacksoor