IOS How to convert image to/from text (Base64)

#import "NSDataAdditions.h"

-(NSString *)getStringFromImage:(UIImage *)image{
if(image){
NSData *dataObj = UIImagePNGRepresentation(image);
return [dataObj base64Encoding];
} else {
return @"";
}
}
//Convert back 
NSData *dataObj = [NSData dataWithBase64EncodedString:beforeStringImage];
UIImage *beforeImage = [UIImage imageWithData:dataObj];

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