前言：一般情況下我們經(jīng)常會(huì)使用到小數(shù)據(jù)的存儲(chǔ)，這是我們可以選擇 NSUserDefaultsl來(lái)進(jìn)行

首先要注意幾點(diǎn)就是： NSUserDefaultsl 只能保存可變的數(shù)據(jù)，如果你要保存的數(shù)據(jù)為不可變的則

            NSUserDefaults *userDFRegister = [NSUserDefaults standardUserDefaults];
            // 取出數(shù)據(jù)
            NSMutableDictionary *registDic = [NSMutableDictionary dictionaryWithDictionary:[userDFRegister objectForKey:@"register"]];
            // 存儲(chǔ)進(jìn)入數(shù)據(jù)
            [registDic setObject:data forKey:@"card_front"];
            NSDictionary *tmp = [NSDictionary dictionaryWithDictionary:registDic];
            [userDFRegister setObject:tmp forKey:@"register"];
            [userDFRegister synchronize];