Decode Base-64 encoded PNG in an NSString
19,084
Solution 1
NSData Base64 library files will help you.
#import "NSData+Base64.h"
//Data from your string is decoded & converted to UIImage
UIImage *image = [UIImage imageWithData:[NSData
dataFromBase64String:strData]];
Hope it helps
Swift 3 Version
It's pretty much the same
//Create your NSData object
let data = NSData(base64Encoded: "yourStringData", options: NSData.Base64DecodingOptions.ignoreUnknownCharacters)
//And then just create a new image based on the data object
let image = UIImage(data: data as! Data)
Swift 2.3 Version
//Create your NSData object
let data = NSData(base64EncodedString: "yourStringData", options: .IgnoreUnknownCharacters)
//And then just create a new image based on the data object
let image = UIImage(data: data!)
Solution 2
You can decode a Base64 encoded string to NSData
:
-(NSData *)dataFromBase64EncodedString:(NSString *)string{
if (string.length > 0) {
//the iPhone has base 64 decoding built in but not obviously. The trick is to
//create a data url that's base 64 encoded and ask an NSData to load it.
NSString *data64URLString = [NSString stringWithFormat:@"data:;base64,%@", string];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:data64URLString]];
return data;
}
return nil;
}
Example use of above method to get an image from the Base64 string:
-(void)imageFromBase64EncodedString{
NSString *string = @""; // replace with encocded string
NSData *imageData = [self dataFromBase64EncodedString:string];
UIImage *myImage = [UIImage imageWithData:imageData];
// do something with image
}
Solution 3
//retrieve your string
NSString *string64 = //... some string base 64 encoded
//convert your string to data
NSData *data = [[NSData alloc] initWithBase64EncodedString:string64 options:NSDataBase64DecodingIgnoreUnknownCharacters];
//initiate image from data
UIImage *captcha_image = [[UIImage alloc] initWithData:data];
Solution 4
NSString *base64String=@"............";
NSData* data = [[NSData alloc] initWithBase64EncodedString:base64String options:0];
UIImage* img = [UIImage imageWithData:data];
//imageview is the refrence outlet of image view
self.imageview.image=img;
Comments
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HurkNburkS almost 2 years
I have some
NSData
which is Base-64 encoded and I would like to decode it, I have seen an example that looks like thisNSData* myPNGData = [xmlString dataUsingEncoding:NSUTF8StringEncoding]; [Base64 initialize]; NSData *data = [Base64 decode:img]; cell.image.image = [UIImage imageWithData:myPNGData];
However this gives me a load of errors, I would like to know what to do in order to get this to work. Is there some type of file I need to import into my project or do I have to include a framework?
These are the errors I get
Use of undeclared identifier 'Base64' Use of undeclared identifier 'Base64' Use of undeclared identifier 'cell'
I have looked everywhere and cannot figure out what is the proper thing to do.
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HurkNburkS almost 11 yearsawesome going to try now :)
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HurkNburkS almost 11 yearsi am getting an error when I try and use NSData*data .. etc which says this No known class method for selector 'dataWithBase64EncodedString:'
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HurkNburkS almost 11 yearsI think i pretty much have it.. one question how would i get this UIImage *image = [UIImage imageWithData:data]; into a UIWebView?
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HurkNburkS almost 11 yearsquick question how would I get myImage into a UIWebView?
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bobnoble almost 11 yearsYou could save the resulting image using
UIImagePNGRepresentation
and save the resultingNSData
object usingwriteToFile:atomically:
(or similar). Instantiate anNSURLRequest
object referencing the image, and use theUIImageView
methodloadRequest:
. Quick answer (-; -
HurkNburkS almost 11 yearsThis didnt really work but it is the post that helped me the most :) I had to use this code ** NSData data = [[NSData alloc] initWithData:[NSData dataFromBase64String:xmlString]];* and to disp[lay on webview [myWebView loadData:data MIMEType:@"image/png" textEncodingName:nil baseURL:nil];
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Aurelien Cobb over 10 yearsWorked for me. Thanks
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Vishal Singh almost 10 yearsiOS7 has new methods for this purpose - (id)initWithBase64EncodedString:(NSString *)base64String options:(NSDataBase64DecodingOptions)options and - (NSString *)base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)options
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Shamas S over 8 yearsPlease consider adding more detail to your answer.