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目标C在NSMutableDictionary中访问NSMutabbleDictionary

nsmutabledictionary object objective-c

-3

Kepa Santos · 技术社区 · 10 年前

我是目标C的新手,在访问方面存在严重问题 NSMutableDictionary s

我有两个对象( Network 和 Beacon ),我想创建一个 NSMutable字典 具有 NSMutable字典 属于 信标 s在里面。

Network.h

#import <Foundation/Foundation.h>

@interface Network : NSObject{
    NSString *id_network;
    NSString *major;
    NSString *active;
    NSString *name;
    NSString *status;
    NSMutableDictionary *beaconsDictionary;
}

@property (nonatomic, strong) NSString *id_network;
@property (nonatomic, strong) NSString *major;
@property (nonatomic, strong) NSString *active;
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *status;
@property (nonatomic, strong) NSMutableDictionary *beaconsDictionary;
@end

Beacon.h

#import <Foundation/Foundation.h>

@interface Beacon : NSObject{
    NSString *id_beacon;
    NSString *major;
    NSString *minor;
    NSString *active;
    NSString *detected;
}

@property (nonatomic, strong) NSString *id_beacon;
@property (nonatomic, strong) NSString *major;
@property (nonatomic, strong) NSString *minor;
@property (nonatomic, strong) NSString *active;
@property (nonatomic, strong) NSString *detected;

@end

我可以创建 NSMutable字典 这样地:

    Beacon *beacon = [[Beacon alloc]init];
        beacon.id_beacon=@"1";
        beacon.major=@"1";
        beacon.minor=@"1";
        beacon.active=@"1";
        beacon.detected=@"0";
    NSMutableDictionary *beaconDic = [[NSMutableDictionary alloc]init];
   [beaconDic setObject:beacon forKey:beacon.id_beacon];

    Network *net = [[Network alloc]init];
        net.id_network=@"1";
        net.major=@"1";
        net.active=@"1";
        net.name=@"network 1";
        net.status=@"1";
        net.beaconsDictionary=beaconDic;


    NSMutableDictionary *networkDic = [[NSMutableDictionary alloc]init]; 
  [networkDic setObject:net forKey:net.id_network];

好的,但现在我如何直接访问“检测到”的信标属性并修改它?

我知道这是一个非常糟糕的例子,但我不知道该怎么做。

2 回复 | 直到 10 年前

DrGodCarl 10 年前

看起来你必须有一个网络id和一个信标id才能到达你需要去的地方。它看起来像:

Network *net = networkDic[netId];
Beacon *beacon = net.beaconsDictionary[beaconId];
beacon.detected = newDetectedValue;

这适用于任意网络ID和信标ID。如果需要,可以对值进行硬编码。

编辑: 在示例代码中值得注意的是,您可以使用更现代的字典赋值。而不是 [dictionary setValue:value forKey:key]; ,你可以 dictionary[key] = value; 。当然,这是个人偏好,但你很可能在最近的事情中看到后者,我发现这一点更清楚。

Sergey Kalinichenko 10 年前

你可以得到你的 Network 和 Beacon 通过提供与字典中的键匹配的键,对象返回:

NSString *nwKey = @"1";
Network *n = networkDic[nwKey];
NSDictionary *bDict = n.beaconsDictionary;
NSString *bnKey = @"1";
Beacon *b = bDict[bnKey];

注: 这是新语法。这是旧的:

NSString *nwKey = @"1";
Network *n = [networkDic objectForKey:nwKey];
NSDictionary *bDict = n.beaconsDictionary;
NSString *bnKey = @"1";
Beacon *b = [bDict objectForKey:bnKey];