在Swift中将UIView转换为.png

Question

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。我尝试将其转换为 Swift，但它并没有很好地转换为 go。 有什么帮助吗？

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];

Answer 1

尝试这个：

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)

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)