图片转base64字符串和base64字符串转图片

1. 图片转base64字符串

NSData *encodedData = UIImageJPEGRepresentation(encodedImage, f);//进行图片压缩从.到（.表示最大压缩，质量最低);
NSString *base64Str = [encodedData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
           

1. base64字符串转图片

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