标签：
一、数据来源
1.来源于mainBundle
2.来源于服务器
二、解析步骤
`1.数据来源于mainBundle
//读取数据
NSString *jsonPath = [[NSBundle mainBundle] pathForResource:@"test.json" ofType:nil];
解析数据(获取key对应的value)接受原则，{}使用字典 []是用数组接受
NSError *error
= nil;
NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingMutableContainers error:&error];
//如果有错误可以打印
If(error){
NSLog(_@”%@”,error.userInfo);
}
//体感温度
NSNumber *feelsTemp =
jsonDic[@"FeelsLikeC"];
//预报天气的温度
NSString *temp =
jsonDic[@"temp_c"];
//城市名字
NSArray *requestArray =
jsonDic[@"request"];
NSDictionary *queryDic =
requestArray[0];
NSString *cityStr =
queryDic[@"query"];
//验证
NSLog(@"feelsTemp:%@; temp:%@;
cityStr:%@", feelsTemp, temp, cityStr);
特殊标注的是重点掌握
2.服务器解析 parseJson –server
因为要与服务器相应，所以就要发送网络请求
//发送请求
NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL
URLWithString:@"http://www.raywenderlich.com/demos/weather_sample/weather.php?format=json"]];
//创建NSURLSession的实例4对象（感觉像是一种媒介）
脑补一下：NSURLSession
NSURLSession提供的功能：
1.通过URL将数据下载到内存
2.通过URL将数据下载到文件系统
3.将数据上传到指定URL
4.在后台完成上述功能
NSURLSession *session = [NSURLSession sharedSession];
//创建任务 其中block中的线程是子线程
NSURLSessionDataTask *task = [session dataTaskWithRequest:request
completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable
response, NSError * _Nullable error) {
NSInteger statusCode =
[(NSHTTPURLResponse *)response statusCode];
if (statusCode == 200) {
//NSData --> JSON
Object(NSDictionary/NSArray)
NSDictionary *jsonDic =
[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//解析jsonDic对应值
[self parseJson:jsonDic];
}
}];
//开始任务
[task resume];
- (void)parseJson:(NSDictionary *)jsonDic {
//解析(子线程)
//湿度
NSDictionary *dataDic =
jsonDic[@"data"];
NSArray *currentArray =
dataDic[@"current_condition"];
NSDictionary *currentDic =
currentArray[0];
NSString *humidityStr =
currentDic[@"humidity"];
//天气描述
NSString *weatherDesc =
dataDic[@"weather"][0][@"weatherDesc"][0][@"value"];
//验证
NSLog(@"humidity:%@;
weatherDesc:%@", humidityStr, weatherDesc);
}
解析最重要的不是怎么得到数据，而是怎么建立数据模型，将庞大繁琐的解析工作剥离控制器，解析单独在一个类里完成。降低主控制器的工作种类，更加清晰的管理代码，下面是两个例子，一步步的将数据的解析独立起来
Demo-01
// TRWeather.m
// Demo02-JSONParse-Server
// TRWeather.h
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface TRWeather : NSObject
//湿度
@property (nonatomic, strong) NSString *humidity;
//天气描述
@property (nonatomic, strong) NSString *weatherDesc;
//给定自定参数,返回id(类方法/实例方法)
+ (id)parseJsonByModel:(NSDictionary *)jsonDic;
// Created by
tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "TRWeather.h"
@implementation TRWeather
+ (id)parseJsonByModel:(NSDictionary *)jsonDic {
return [[self alloc]
initWithJson:jsonDic];
}
- (id)initWithJson:(NSDictionary *)jsonDic {
//解析逻辑
if (self = [super init]) {
self.humidity =
jsonDic[@"data"][@"current_condition"][0][@"humidity"];
//天气描述
}
return self;
}
//
ViewController.m
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "ViewController.h"
#import "TRWeather.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//发送请求
NSURLRequest *request = [NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://www.raywenderlich.com/demos/weather_sample/weather.php?format=json"]];
NSURLSession *session = [NSURLSession
sharedSession];
NSURLSessionDataTask *task = [session
dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data,
NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSInteger statusCode =
[(NSHTTPURLResponse *)response statusCode];
if (statusCode == 200) {
//NSData --> JSON
Object(NSDictionary/NSArray)
NSDictionary *jsonDic =
[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//解析jsonDic对应值
[self parseJson:jsonDic];
}
}];
[task resume];
//接收服务器返回的数据
}
- (void)parseJson:(NSDictionary *)jsonDic {
//解析(子线程)
TRWeather *weather = [TRWeather
parseJsonByModel:jsonDic];
//验证
NSLog(@"humidity:%@",
weather.humidity);
}
Demo 2
// TRDaily.h
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface TRDaily : NSObject
//最高温
@property (nonatomic, strong) NSString *tempMaxC;
//最低温
@property (nonatomic, strong) NSString *tempMinC;
//天气图标的url
@property (nonatomic, strong) NSString *iconURL;
//给定字典参数,返回id
+ (id)parseJsonByDic:(NSDictionary *)weatherDic;
//
// TRDaily.m
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "TRDaily.h"
@implementation TRDaily
+ (id)parseJsonByDic:(NSDictionary *)weatherDic {
return [[self alloc]
initWithJsonDic:weatherDic];
}
- (id)initWithJsonDic:(NSDictionary *)weatherDic {
if (self = [super init]) {
//最高温
self.tempMaxC =
weatherDic[@"tempMaxC"];
//最低温
self.tempMinC =
weatherDic[@"tempMinC"];
//图片url的value
self.iconURL =
weatherDic[@"weatherIconUrl"][0][@"value"];
}
return self;
}
@end
//
TRDataManager.h
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface TRDataManager : NSObject
//给定字典,返回已经解析好得TRDaily模型对象组成的数组
+ (NSArray *)parseWeatherArray:(NSDictionary *)jsonDic;
@end
//
TRDataManager.m
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "TRDataManager.h"
#import "TRDaily.h"
@implementation TRDataManager
+ (NSArray *)parseWeatherArray:(NSDictionary *)jsonDic {
NSArray *weatherArray =
jsonDic[@"data"][@"weather"];
//声明可变数组(存储已经转完的模型对象)
NSMutableArray *mutableArray =
[NSMutableArray array];
for (NSDictionary *weatherDic in
weatherArray) {
//weatherDic -> TRDaily
TRDaily *daily = [TRDaily
parseJsonByDic:weatherDic];
[mutableArray
addObject:daily];
}
return [mutableArray copy];
}
@end
//
// TRWeather.h
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface TRWeather : NSObject
//湿度
@property (nonatomic, strong) NSString *humidity;
//天气描述
@property (nonatomic, strong) NSString *weatherDesc;
//给定自定参数,返回id(类方法/实例方法)
+ (id)parseJsonByModel:(NSDictionary *)jsonDic;
@end
//
// TRWeather.m
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "TRWeather.h"
@implementation TRWeather
+ (id)parseJsonByModel:(NSDictionary *)jsonDic {
return [[self alloc]
initWithJson:jsonDic];
}
- (id)initWithJson:(NSDictionary *)jsonDic {
//解析逻辑
if (self = [super init]) {
self.humidity =
jsonDic[@"data"][@"current_condition"][0][@"humidity"];
//天气描述
}
return self;
}
@end
//
// ViewController.m
// Demo02-JSONParse-Server
//
// Created by tarena on 15/12/12.
// Copyright © 2015年
tarena. All rights reserved.
//
#import "ViewController.h"
#import "TRWeather.h"
#import "TRDaily.h"
#import "TRDataManager.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//发送请求
NSURLRequest *request = [NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://www.raywenderlich.com/demos/weather_sample/weather.php?format=json"]];
NSURLSession *session = [NSURLSession
sharedSession];
NSURLSessionDataTask *task = [session
dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data,
NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSInteger statusCode =
[(NSHTTPURLResponse *)response statusCode];
if (statusCode == 200) {
//NSData --> JSON
Object(NSDictionary/NSArray)
NSDictionary *jsonDic =
[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//解析jsonDic对应值
[self
parseJson:jsonDic];
}
}];
[task resume];
//接收服务器返回的数据
}
- (void)parseJson:(NSDictionary *)jsonDic {
//第一种情况: 字典 ---> TRWeather
//解析(子线程)
TRWeather *weather = [TRWeather
parseJsonByModel:jsonDic];
//验证
NSLog(@"humidity:%@",
weather.humidity);
//第二种情况: 数组(字典,字典....) ---> 数组(TRDaily,TRDaily....)
NSArray *weatherArray =
jsonDic[@"data"][@"weather"];
//声明可变数组(存储已经转完的模型对象)
NSMutableArray *mutableArray =
[NSMutableArray array];
for (NSDictionary *weatherDic in
weatherArray) {
//weatherDic -> TRDaily
TRDaily *daily = [TRDaily
parseJsonByDic:weatherDic];
[mutableArray
addObject:daily];
}
//验证(mutableArray)
for (TRDaily *daily in mutableArray) {
NSLog(@"maxC:%@; minC:%@;
url:%@", daily.tempMaxC, daily.tempMinC, daily.iconURL);
}
//第三种情况: 将控制器中的循环解析封装到TRDataManager中
NSArray *array = [TRDataManager
parseWeatherArray:jsonDic];
}
- (void)didReceiveMemoryWarning {
[super
didReceiveMemoryWarning];
// Dispose of any resources that can
be recreated.
}
@end
标签：
原文地址：http://www.cnblogs.com/zhao-jie-li/p/PraseJson.html
