Decode Base-64 Encoded Png in an Nsstring

Decode Base-64 encoded PNG in an NSString

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!)

Decode Base-64 encoded PNG in an NSString

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!)

Base64 String when decoded to png is cut off with Objective-C

In terms of why it's getting cut off, I suspect you're looking at the base64 string in the debugger, which will truncate it. Actually NSLog the string and you'll see it's longer than what you're seeing in the debugger.

A couple of other unrelated observations:

1. You should not use stringWithUTF8String with [base64 bytes] because the NSData will not be null terminated. If you really needed to convert it to a string, you'd use initWithData rather than stringWithUTF8String:

   return [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];
   

2. As others have pointed out, you can bypass the creation of the NSData of the base64 altogether, and create the string directly:

   return [imageData base64EncodedStringWithOptions:0];
   

3. I'm not sure why you're taking the NSData from the server and round tripping it through a UIImage at all. You can theoretically just encode the data from the server directly:

   NSURL* imageUrl = [NSURL URLWithString:url];
   NSData* urlData = [NSData dataWithContentsOfURL:imageUrl];
   return [urlData base64EncodedStringWithOptions:0];
   

   The server is already returning you the NSData of a PNG representation. You don't need to do that UIImage and UIImagePNGRepresentation stuff at all. You're actually generating a PNG that is considerably larger than the one the server returned to you.

4. I'd advise against using dataWithContentsOfURL, because that's a synchronous network call. You probably should use NSURLSession and change this to be an asynchronous method.

Convert between UIImage and Base64 string

Swift

First we need to have image's NSData

//Use image name from bundle to create NSData
let image : UIImage = UIImage(named:"imageNameHere")!
//Now use image to create into NSData format
let imageData:NSData = UIImagePNGRepresentation(image)!

//OR next possibility

//Use image's path to create NSData
let url:NSURL = NSURL(string : "urlHere")!
//Now use image to create into NSData format
let imageData:NSData = NSData.init(contentsOfURL: url)!

Swift 2.0 > Encoding

let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)

Swift 2.0 > Decoding

let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!

Swift 3.0 > Decoding

let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!

Encoding :

let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
print(strBase64)

Decoding :

let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions(rawValue: 0))!
let decodedimage:UIImage = UIImage(data: dataDecoded)!
print(decodedimage)
yourImageView.image = decodedimage

Swift 3.0

let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
let decodedimage = UIImage(data: dataDecoded)
yourImageView.image = decodedimage

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Objective-C

iOS7 > version

You can use NSData's base64EncodedStringWithOptions

Encoding :

- (NSString *)encodeToBase64String:(UIImage *)image {
 return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

Decoding :

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
  NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
  return [UIImage imageWithData:data];
}

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iOS 6.1 and < version

First Option : Use this link to encode and decode image

Add Base64 class in your project.

Encoding :

 NSData* data = UIImageJPEGRepresentation(yourImage, 1.0f);
 NSString *strEncoded = [Base64 encode:data];

Decoding :

 NSData* data = [Base64 decode:strEncoded ];;
 image.image = [UIImage imageWithData:data];

Another Option: Use QSUtilities for encoding and decoding

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How to let local .png image convert to base64 string

Use this code:

NSData *imageData = UIImagePNGRepresentation(image);
NSString * base64String = [imageData base64EncodedStringWithOptions:0];

Hope this helps.

Base 64 decoding produces empty

Avoid converting to a string before decoding:

NSData *decodedData = [[NSData alloc] initWithBase64EncodedData:data options:NSDataBase64DecodingIgnoreUnknownCharacters];
NSString *decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];

Some implementations of Base64 add line breaks every 64 characters. You should be able to address this by using this option: NSDataBase64DecodingIgnoreUnknownCharacters.

Base64 Encoding for NSString

How do I do base64 encoding on iphone-sdk?

Have a look at this.

and then use these methods to make use of the above methods(given in link)
Converting NSString to Base64 Data for XML Serialization
taken from above link.

+ (NSString *)toBase64String:(NSString *)string {
NSData *data = [string dataUsingEncoding: NSUnicodeStringEncoding];

NSString *ret = [NSStringUtil base64StringFromData:data length:[data length]];

return ret;
}

+ (NSString *)fromBase64String:(NSString *)string {
NSData  *base64Data = [NSStringUtil base64DataFromString:string];

NSString* decryptedStr = [[NSString alloc] initWithData:base64Data encoding:NSUnicodeStringEncoding];

return [decryptedStr autorelease];
}

Convert array of image path into base64 encoded string.?

Try this to cycle all your images and save each encoded string into a new array:

NSMutableArray *encodedImages = [NSMutableArray new];

for (NSString *path in recipeImages)
{
    UIImage *image       = [UIImage imageWithContentsOfFile:path];
    NSData *imageData    = UIImagePNGRepresentation(image);
    NSString *dataString = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

    [encodedImages addObject:dataString];
}

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