圖檔轉base64字元串和base64字元串轉圖檔

1. 圖檔轉base64字元串

NSData *encodedData = UIImageJPEGRepresentation(encodedImage, f);//進行圖檔壓縮從.到（.表示最大壓縮，品質最低);
NSString *base64Str = [encodedData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
           

1. base64字元串轉圖檔

NSData *decodedData = [NSData alloc]initWithBase64EncodedString:base64Str options:NSDataBase64DecodingIgnoreUnknownCharacters];
UIImage *decodedImage = [UIImage imageWithData:decodedData];