ios - 在ios中以png格式保存签名图片

Question

我有用于签名的可绘制文本，我希望此上下文以具有特定路径的 png 格式保存，但我不能这样做。我希望我的绘图图像以 png 格式保存，我可以在任何地方使用

**Code for png format and path**

NSData *imageData = UIImagePNGRepresentation(_SignatureView.signatureImage);

 NSString *imagePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"/imageName.png"];

[imageData writeToFile:imagePath atomically:YES];

_SignatureView is a property and signatureImage is a method 

**code of signature image method**

- (UIImage *)signatureImage
{
    if (!self.hasSignature)
        return nil;


    UIImage *screenshot = [self snapshot];


    return screenshot;
}

Answer 1

NSString *docPath=  @"/Users/.../.../";
NSString *filePath=[docPath stringByAppendingPathComponent:@"PdfFileName.pdf"];

NSMutableData pdfData=[NSMutableData data];
CGRect bounds = CGRectMake(0, 0, 612, 792);
UIGraphicsBeginPDFContextToData(pdfData, bounds, nil);

CGContextRef pdfContext = UIGraphicsGetCurrentContext();
UIGraphicsBeginPDFPage();

[YourSignature.layer renderInContext:pdfContext];
UIGraphicsEndPDFContext();
[pdfData writeToFile:filePath atomically:YES];