Convert Image to Base64 string

ConvertImageToBase64String.m

// Ref: http://stackoverflow.com/questions/11251340/convert-image-to-base64-string-in-ios-swift

// iOS7 > version for Objective-C
// You can use NSData's base64EncodedStringWithOptions
// Now encode as:

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

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

// iOS 6.1>
// First Option : Use this link[http://www.imthi.com/blog/programming/iphone-sdk-base64-encode-decode.php] to encode and decode image
// Add Base64[http://www.imthi.com/wp-content/uploads/2010/08/base64.zip] class in your project. Now encode as:

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

 NSData* data = [Base64 decode:strEncoded ];;
 image.image = [UIImage imageWithData:data];
 
// Another Option: Use QSUtilities[https://github.com/mikeho/QSUtilities/blob/master/QSStrings.h]  for encoding and decoding

ConvertImageToBase64String.swift

//create image instance
//with image name from bundle
var image : UIImage = UIImage(named:"imageNameHere")!
var imageData = UIImagePNGRepresentation(image)

//OR with path
var url:NSURL = NSURL(string : "urlHere")!
var imageData:NSData = NSData.dataWithContentsOfURL(url, options: nil, error: nil)

// Encoding
let base64String = imageData.base64EncodedStringWithOptions(.allZeros)
println(base64String)

// Decoding
let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions.fromRaw(0)!)
var decodedimage = UIImage(data: decodedData)
println(decodedimage)
yourImageView.image = decodedimage as UIImage