ios - 从内存添加/删除/编辑字典的一种方法

现在，如果我有一个列表，其中NSMutableArry为NSDictionaries，我想编辑/删除/添加对象，并保存为用户默认值。 （obj-c / swift）

所以我将为每个操作提供一个功能，例如将一个功能添加到列表中：

-(void)addMedicineToArray:(NSDictionary*)medicine
{
    NSMutableArray *medicines=[[NSMutableArray alloc] init];
    medicines=[[[NSUserDefaults standardUserDefaults] objectForKey:@"Medicines"] mutableCopy];
    if(!medicines)
        medicines=[[NSMutableArray alloc] init];

    [medicines addObject:medicine];

    [[NSUserDefaults standardUserDefaults] setObject:medicines forKey:@"Medicines"];
    [[NSUserDefaults standardUserDefaults] synchronize];


}

然后另一种方法删除，另一种方法编辑。我很确定这不是一个聪明的解决方案，尽管我不认为有一种简单的解决方案可以用一种清晰的方法做到这一点。

有没有比写3/4方法更好的实现呢？

最佳答案

//
//  MYCustomViewControllerClass.m
//  Fro StackOverFlow
//
//  Created by Naresh Reddy M on 16/03/16.
//  Copyright © 2016 Naresh Reddy M. All rights reserved.
//

#import "MYCustomViewControllerClass.h"
typedef NS_ENUM(NSInteger, EditingType)
{
    kEditingTypeDeleteObj = 1,
    kEditingTypeUpdateObj = 2,
    kEditingTypeAddObj = 3,
    // if needed,Add few More as per your requirement .
};
@implementation MYCustomViewControllerClass
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Forming Medicine Data Dict & Array
    NSMutableArray <NSDictionary *>*medicinesArray;
    if([[[NSUserDefaults standardUserDefaults] objectForKey:@"MYMeds"]  mutableCopy])
        medicinesArray = [[[NSUserDefaults standardUserDefaults] objectForKey:@"MYMeds"]  mutableCopy];
    else
    {
        medicinesArray = [NSMutableArray new];
        for(int i = 0; i < 10 ; ++i)
        {
            NSMutableDictionary *medicineDetailsDict = [NSMutableDictionary new];
            [medicineDetailsDict setValue:[NSString stringWithFormat:@"Medicine : %d",1+i] forKey:[NSString stringWithFormat:@"Name"]];
            [medicineDetailsDict setValue:[NSString stringWithFormat:@"D%d",1+i] forKey:[NSString stringWithFormat:@"DrugID"]]; // Please do maintain a UNIQUE ID for Your Drug
            // You can have other info about drug with appropriate keys

            [medicinesArray addObject:medicineDetailsDict];
        }
    }

    // 1 - Deleting your medicine with DrugID  D1  from aray & saving updated medicines Array into userdefaults
    // Name will be changed for Medicine With DrugID - D1 from @"Medicine : 1" to @"Updated Data for Name Key"
    NSMutableDictionary *medicine1 = [medicinesArray[0] mutableCopy];
    [medicine1 setValue:@"Updated Data for Name Key" forKey:@"Name"]; // Im updating its name here
    [self updateMedicine:medicine1 inToArray:medicinesArray withUpdateType:kEditingTypeUpdateObj];
    // Name of Medicine With D1 Id Has been Updated


    // 2 - Adding New Medicince To your Array & saving updated Array In user defaults
    NSMutableDictionary *myNewMed = [NSMutableDictionary new];
    [myNewMed setValue:@"D150" forKey:@"DrugID"];
    [myNewMed setValue:@"New Named Drug" forKey:[NSString stringWithFormat:@"Name"]];
    NSLog(@"%@",[medicinesArray description]); // D150 will be Added
    [self updateMedicine:myNewMed inToArray:medicinesArray withUpdateType:kEditingTypeAddObj];
    NSLog(@"%@",[medicinesArray description]); // D150 Has been Added


    // 3 - Deleting A Medicine From DB
    // D150 Will be Deleted
    [self updateMedicine:myNewMed inToArray:medicinesArray withUpdateType:kEditingTypeDeleteObj];
    medicinesArray = [[[NSUserDefaults standardUserDefaults] objectForKey:@"MYMeds"]  mutableCopy];
    NSLog(@"%@",[medicinesArray description]); // D150 Was deleted
}
-(void)updateMedicine:(NSMutableDictionary *)updatedMedicine inToArray:(NSMutableArray <NSDictionary *>*)arrayOfMedicines withUpdateType:(EditingType)editType
{
    switch (editType)
    {
        case kEditingTypeDeleteObj:
        {
            NSString *idOfRecivedDrug = updatedMedicine[@"DrugID"];
            for(NSDictionary *med in arrayOfMedicines)
            {
                if([med[@"DrugID"] isEqualToString:idOfRecivedDrug])
                {
                    NSInteger index = [arrayOfMedicines indexOfObject:med];
                    [arrayOfMedicines removeObjectAtIndex:index];
                    [[NSUserDefaults standardUserDefaults] setObject:arrayOfMedicines forKey:@"MYMeds"];
                    [[NSUserDefaults standardUserDefaults] synchronize];
                }
            }
        }
            break;
        case kEditingTypeAddObj:
        {
            NSString *idOfRecivedDrug = updatedMedicine[@"DrugID"];
            bool bIsDrugFound = false;
            for(NSDictionary *med in arrayOfMedicines)
            {
                if([med[@"DrugID"] isEqualToString:idOfRecivedDrug])
                {
                    bIsDrugFound = true;
                    break;
                }
            }
            if(bIsDrugFound)
                NSLog(@"Seems you are trying to add drug to existing UNIQUE ID,Try Updating Other than adding it as a new");
            else
            {
                [arrayOfMedicines addObject:updatedMedicine];
                [[NSUserDefaults standardUserDefaults] setObject:arrayOfMedicines forKey:@"MYMeds"];
                [[NSUserDefaults standardUserDefaults] synchronize];            }
        }
            break;
        case kEditingTypeUpdateObj:
        {
            NSString *idOfRecivedDrug = updatedMedicine[@"DrugID"];
            for(NSDictionary *med in arrayOfMedicines)
            {
                if([med[@"DrugID"] isEqualToString:idOfRecivedDrug])
                {
                    // Found Your Drug now Need to edit it's data
                    NSInteger index = [arrayOfMedicines indexOfObject:med];
                    [arrayOfMedicines replaceObjectAtIndex:index withObject:updatedMedicine];
                    [[NSUserDefaults standardUserDefaults] setObject:arrayOfMedicines forKey:@"MYMeds"];
                    [[NSUserDefaults standardUserDefaults] synchronize];
                    break;
                }
                else
                    NSLog(@"Your medicine was new,probably need to add it into the dictionary");

            }
        }
            break;
        default:
            break;
    }
}
@end

乐意效劳 ：）
玩得开心

关于ios - 从内存添加/删除/编辑字典的一种方法，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36013092/