JSJP_School/LN_School/UserInfo.m

//
//  Created by apple on 2017/4/5.
//  Copyright © 2017年 Danson. All rights reserved.
//


#import "UserInfo.h"

/**infoKeys是用来在userDefault里面存取数据的
 */

static NSArray *infoKeys;

static UserInfo *userInfo = nil;

void SaveObjectForKey(id object, NSString *key);

@implementation UserInfo


+(UserInfo *)shareInfo
{
    static dispatch_once_t onceToken ;
    dispatch_once(&onceToken, ^{
        userInfo = [[UserInfo alloc] init] ;
        
        infoKeys = @[@"userDict",@"defaultHttp"];
        
        NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
        for (NSString *key in infoKeys)
        {
            //读取空字典不会导致崩溃
            id obj = [ud objectForKey:key];
            [userInfo setValue:obj forKey:key];
        }
    }) ;
    return userInfo ;
}

-(void)setUserDict:(NSDictionary *)userDict
{
    NSMutableDictionary *dic = [NSMutableDictionary dictionaryWithDictionary:userDict];
    for (NSString *akey in dic.allKeys) {
        id obj = dic[akey];
        if ([obj isEqual:[NSNull null]]) {
            [dic setValue:@"" forKey:akey];
        }
    }
    
    _userDict = [NSMutableDictionary dictionaryWithDictionary:dic];
    
    SaveObjectForKey(dic, infoKeys[0]);
}

-(void)setDefaultHttp:(NSString *)defaultHttp
{
    _defaultHttp = defaultHttp;
    SaveObjectForKey(defaultHttp, infoKeys[1]);
}


@end


void SaveObjectForKey(id object, NSString* key)
{
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    if (!object || [object isEqual:[NSNull null]]) {
        if ([ud objectForKey:key]) {
            [ud removeObjectForKey:key];
        }
    }else{
        
        [ud setObject:object forKey:key];
    }
    [ud synchronize];
}