处理JSON格式的数据

　　JSON格式的数据是最常用的数据格式，处理方法的选择就显得比较重要了。我常用的一种是用对象来接收，然后保存在数组中，需要时直接从数组中取值。下面列出一个小例子。

　　.h文件中：

#import <Foundation/Foundation.h>

@interface DailyWeathers : NSObject

@property(nonatomic,strong) NSString *date;

@property(nonatomic,strong) NSString *maxtempF;

@property(nonatomic,strong) NSString *mintempF;

@property(nonatomic,strong) NSURL *weatherIconUrl;

+(id)weatherWithJSON:(NSDictionary*)json;

@end

　　.m文件中：

#import "DailyWeathers.h"

@implementation DailyWeathers

+(id)weatherWithJSON:(NSDictionary *)json{

return [[self alloc] initWithJSON:json];

}

-(id)initWithJSON:(NSDictionary*)json{

self = [super init];

if (self) {

self.date = json[@"date"];

self.maxtempF = json[@"maxtempF"];

self.mintempF = json[@"mintempF"];

self.weatherIconUrl = [NSURL URLWithString:json[@"hourly"][3][@"weatherIconUrl"][0][@"value"]];

}

return self;

}

@end

　　出来网络请求的文件中，直接调用下面的方法：

-(NSArray*)dailyWeathersWithKeyFromJSON:(id)json{

NSMutableArray *result = [NSMutableArray new];

NSArray *weathers = json[@"data"][@"weather"];

for (NSDictionary *weather in weathers) {

DailyWeathers *dailyWeather = [DailyWeathers weatherWithJSON:weather];

[result addObject:dailyWeather];

}

return [result copy];

}