IOS图片转base64字符串和字符串转回图片

（文章转载自：http://blog.csdn.net/sy_bz/article/details/18960077）

UIImage图片转成base64字符串：

UIImage *_originImage = [UIImage imageNamed:@"full_playlist_hl.png"];

NSData *_data = UIImageJPEGRepresentation(_image, 1.0f);

NSString *_encodedImageStr = [_data base64Encoding];

NSLog(@"===Encoded image:\n%@", _encodedImageStr);

Base64字符串转UIImage图片：

NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];

UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];

NSLog(@"===Decoded image size: %@", NSStringFromCGSize(_decodedImage.size));

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==========华丽的分割线===========

+ (NSString *) image2String:(UIImage *)image {
    NSData *pictureData = UIImageJPEGRepresentation(image, 0.5);
    NSString *pictureDataString = [pictureData base64Encoding];
    return pictureDataString;
}

+ (UIImage *) string2Image:(NSString *)string {
    UIImage *image = [UIImage imageWithData:[NSData dataWithBase64EncodedString:string]];
    return image;
}