Question

我有以下JSON响应的摘录：

"em_phone": "987654321",
    "stage": 2,
    "stage_count": 2,
    "allowed_staff": 1,
    "expected_staff": null,
    "active_staff": 0,
    "url": "/api2/jobs/508190271",
    "user": {
        "owned": false,
        "contractor": false,
        "pending": false,
        "will_block": false,
        "blocking": false,
        "writable": true,
        "flow": {
            "blind": false
        }

我如何从“用户”访问“承包商”？

读取JSON的代码：

for (NSDictionary *dataDict in jsonObjects) {
    NSString *title_data = [dataDict objectForKey:@"id"];
    NSString *author_data = [dataDict objectForKey:@"user"];
    NSString *thumbnail_data = [dataDict objectForKey:@"created_at"];

问题在于以下几行：

NSString *author_data = [dataDict objectForKey:@"user"];

感谢。

Answer 1

：“user”是一本字典。将您的行更改为

NSDictionary *author_data = [dataDict objectForKey:@"user"];

并访问数据[author_data objectForKey:@"contractor"]

Answer 2

[dataDict objectForKey:@"user"]将返回另一个NSDictionary。

你应该写一些类似的东西：

NSDictionary *user = [dataDict objectForKey:@"user"];

然后：

BOOL isContractor = [[user objectForKey:@"contractor"] boolValue];

Answer 3

过去一周我一直在研究这个问题。我决定写自己的解决方案。它非常简单，并且基于现有的Apple功能。

见这里：https://github.com/gslinker/GSObject

在这里：http://digerati-illuminatus.blogspot.com/2016/01/objective-c-and-json-convert-subclass.html

对于您的数据模型对象，它继承自GSObject而不是NSObject。以下是继承自GSObject的ThingOne示例：

ThingOne* object1 = [[ThingOne alloc] init];
object1.name = @"John Jones";


NSData* jsonData1 = [object1 toJsonDataWithOptions:NSJSONWritingPrettyPrinted];
NSString *jsonString1 = [object1 toJsonStringWithOptions:NSJSONWritingPrettyPrinted];

NSDictionary<NSString *,id> *dict1 =  [GSObject dictionaryWithValues:object1];

NSString *roundTripJson1 = [object1 toJsonStringWithOptions:NSJSONWritingPrettyPrinted];




//
//  ThingOne.h
//  JasonStuff
//
//  Created by Geoffrey Slinker on 12/28/15.
//  Copyright © 2015 Slinkworks LLC. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "GSObject.h"
#import "ThingTwo.h"

@interface ThingOne : GSObject

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) ThingTwo *thingTwo;
@property (nonatomic, retain) NSArray *values;
@property (nonatomic, retain) NSDictionary *dict;
@property int myInt;
@property float myFloat;
@property BOOL myBool;
@property (nonatomic, retain) NSNumber* someMoney;


@end

//
//  ThingOne.m
//  JasonStuff
//
//  Created by Geoffrey Slinker on 12/28/15.
//  Copyright © 2015 Slinkworks LLC. All rights reserved.
//

#import "ThingOne.h"

@implementation ThingOne

@synthesize name;
@synthesize thingTwo;
@synthesize values;
@synthesize dict;
@synthesize myInt;
@synthesize myFloat;
@synthesize myBool;
@synthesize someMoney;

- (instancetype)init
{
self = [super init];

thingTwo = [[ThingTwo alloc] init];

thingTwo.stuff = @"Thing Two Stuff";
thingTwo.someOtherStuff = @"Thing Two Other Stuff";
NSDateFormatter *dateFormater = [[NSDateFormatter alloc]init];
[dateFormater setDateFormat:@"yyyy-mm-dd"];
thingTwo.someDate =  [dateFormater dateFromString:@"1963-10-07"];

values = [NSArray arrayWithObjects:@"Value1", @"Value2", @"Value3", nil];

dict = [NSDictionary dictionaryWithObjectsAndKeys:@"value1", @"key1", @"value2", @"key2", nil];

myInt = 5431;
myFloat = 123.456f;
myBool = YES;

someMoney = [NSNumber numberWithInt:503];

return self;
}

@end

//
//  ThingTwo.h
//  JasonStuff
//
//  Created by Geoffrey Slinker on 12/28/15.
//  Copyright © 2015 Slinkworks LLC. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "GSObject.h"

@interface ThingTwo : GSObject

@property (nonatomic, retain) NSString *stuff;
@property (nonatomic, retain) NSString *someOtherStuff;
@property (nonatomic, retain) NSDate *someDate;
@property (nonatomic, retain) NSString *nullString;
@property (nonatomic, retain) NSDate *nullDate;

@end

//
//  ThingTwo.m
//  JasonStuff
//
//  Created by Geoffrey Slinker on 12/28/15.
//  Copyright © 2015 Slinkworks LLC. All rights reserved.
//

#import "ThingTwo.h"

@implementation ThingTwo

@synthesize stuff;
@synthesize someOtherStuff;
@synthesize someDate;

- (instancetype)init
{
self = [super init];

someDate = [NSDate date];

return self;
}

@end

以下是JSON输出的示例：

{
  "values" : [
    "Value1",
    "Value2",
    "Value3"
  ],
  "myInt" : 5431,
  "myFloat" : 123.456,
  "myBool" : true,
  "someMoney" : "$503.00",
  "thingTwo" : {
    "stuff" : "Thing Two Stuff",
    "nullDate" : null,
    "someDate" : "1963-01-07 07:10:00 +0000",
    "nullString" : null,
    "someOtherStuff" : "Thing Two Other Stuff"
  },
  "name" : "John Jones",
  "dict" : {
    "key1" : "value1",
    "key2" : "value2"
  }
}

Objective-C JSON - 深入了解JSON？

3 个答案: