iOS 网络请求中空类型字符串处理

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网络请求中空类型字符串处理

将网络请求返回的空数据所有NSNull 类型转化成 @""

给NSDictionary 扩展一个分类

NSDictionary+Nsnull.h文件

/*
 *把服务器返回的<null> 替换为“”
 *json表示获取到的带有NULL对象的json数据
 *NSDictionary *newDict = [NSDictionary changeType:json];
 */
+(id)changeType:(id)myObj;

NSDictionary+Nsnull.m文件

//将NSDictionary中的Null类型的项目转化成@""
+(NSDictionary *)nullDic:(NSDictionary *)myDic{
    NSArray *keyArr = [myDic allKeys];

    NSMutableDictionary *resDic = [[NSMutableDictionary alloc]init];
    for (int i = 0; i < keyArr.count; i ++) {
        id obj = [myDic objectForKey:keyArr[i]];
        obj = [self changeType:obj];
        [resDic setObject:obj forKey:keyArr[i]];
    }
    return resDic;
}

//将NSArray中的Null类型的项目转化成@""
+(NSArray *)nullArr:(NSArray *)myArr{
    NSMutableArray *resArr = [[NSMutableArray alloc] init];
    for (int i = 0; i < myArr.count; i ++) {
        id obj = myArr[i];
        obj = [self changeType:obj];
        [resArr addObject:obj];
    }
    return resArr;
}

//将NSString类型的原路返回
+(NSString *)stringToString:(NSString *)string{
    return string;
}

//将Null类型的项目转化成@""
+(NSString *)nullToString{
    return @"";
}

//主要方法
//类型识别:将所有的NSNull类型转化成@""
+(id)changeType:(id)myObj{
    if ([myObj isKindOfClass:[NSDictionary class]]){
        return [self nullDic:myObj];
    }else if([myObj isKindOfClass:[NSArray class]]) {
        return [self nullArr:myObj];
    }else if([myObj isKindOfClass:[NSString class]]){
        return [self stringToString:myObj];
    }else if([myObj isKindOfClass:[NSNull class]]){
        return [self nullToString];
    }else{
        return myObj;
    }
}