zhiying_flutter_alibc/ios/Classes/Tools/FlutterAlibcTools.m

//
//  FlutterAlibcTools.m
//  flutter_alibc
//
//  Created by 吴兴 on 2019/8/29.
//

#import "FlutterAlibcTools.h"

@implementation FlutterAlibcTools

+ (BOOL)isNil:(NSString *)string {
    if (string == nil) {
        return YES;
    }
    
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    return [[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length] == 0;
}

+ (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString{
    if (jsonString == nil) {
        return nil;
    }
    
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *err;
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData
                                                        options:NSJSONReadingMutableContainers
                                                          error:&err];
    if(err)
    {
        NSLog(@"json解析失败：%@",err);
        return nil;
    }
    return dic;
}

+ (id)nullToNil:(id)obj{
    if ([obj isKindOfClass:[NSNull class]]) {
        return nil;
    }
    return obj;
}


#pragma mark - 公有方法，直接使用
//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;
    }
}

#pragma mark - 私有方法
//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 @"<NSNull>";
    return @"";
}

@end