以 png 格式保存签名图像 ios
Save signature image in png format in ios
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,但我做不到 this.I 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;
}
这样试试
- (void)saveImage: (UIImage*)image
{
if (image != nil)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithString: @"test.png"] ];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
}
}
并使用以下代码获取图像
- (UIImage*)loadImage
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithString: @"test.png"] ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
return image;
}
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];
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,但我做不到 this.I 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;
}
这样试试
- (void)saveImage: (UIImage*)image
{
if (image != nil)
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithString: @"test.png"] ];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
}
}
并使用以下代码获取图像
- (UIImage*)loadImage
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithString: @"test.png"] ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
return image;
}
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];