UIImage *_originImage = [UIImage imageNamed:@"0.jpg"]; NSData *_data = UIImageJPEGRepresentation(_originImage, 1.0f); NSString *_encodedImageStr = [_data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength]; [_encodedImageStr writeToFile:@"/Users/Singer/Documents/0.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil]; NSLog(@"===Encoded image:\n%@", _encodedImageStr);
NSString *imageStr = [NSString stringWithContentsOfFile:@"/Users/Singer/Documents/0.txt" encoding:NSUTF8StringEncoding error:nil]; NSData *d = [[NSData alloc]initWithBase64EncodedString:imageStr options:NSDataBase64DecodingIgnoreUnknownCharacters]; UIImage *image = [UIImage imageWithData:d]; UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 50, 200, 200)]; imageView.image = image; [self.view addSubview:imageView]; [d writeToFile:@"/Users/Singer/Documents/1111.jpg" atomically:YES];
原文：http://www.cnblogs.com/damiao/p/4461655.html