Objective-C Json 使用

Objective-c json

通过使用NSJSONSerialization 能够Json与Foundation的相互转换。以下详细介绍 Objective-c json 的使用。

Json To Fundation

使用 JSONObjectWithData 能够将 Json 转化为 Foundation。Json的顶层能够是{} 或 []因此能够有 NSDictionary 和 NSArray 两种格式。读取使用 ObjectForKey 返回相应的对象。

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NSString* items = @"{"items":["item0","item1","item2"]}";   NSData *data= [items dataUsingEncoding:NSUTF8StringEncoding];   NSError *error = nil;   id jsonObject = [NSJSONSerialization JSONObjectWithData:data                     options:NSJSONReadingAllowFragments                     error:&error];   if ([jsonObject isKindOfClass:[NSDictionary class]]){       NSDictionary *dictionary = (NSDictionary *)jsonObject;       NSLog(@"Dersialized JSON Dictionary = %@", dictionary);   }else if ([jsonObject isKindOfClass:[NSArray class]]){       NSArray *nsArray = (NSArray *)jsonObject;       NSLog(@"Dersialized JSON Array = %@", nsArray);   } else {       NSLog(@"An error happened while deserializing the JSON data.");   }   NSDictionary *dict = (NSDictionary *)jsonObject;   NSArray* arr = [dict objectForKey:@"items"]; NSLog(@"list is %@",arr);

Fundation To Json

使用 dataWithJsonObject 能够将 Fundation 转换为 Json。当中 options:NSJSONWritingPrettyPrinted 是分行输出json ,无空格输出使用 option:kNilOptions。

以下这段代码是IOS内购获取商品列表。获取后。将内容加入到Json中。

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NSArray *myProduct = response.products; NSDictionary *myDict; NSMutableDictionary *dict = [NSMutableDictionary                                 dictionaryWithCapacity: 4];   for(int i  = 0;i<myProduct.count;++i) {       //NSLog(@"----------------------");     //NSLog(@"Product title: %@" ,[myProduct[i] localizedTitle]);     //NSLog(@"Product description: %@" ,[myProduct[i] localizedDescription]);     //NSLog(@"Product price: %@" ,[myProduct[i] price]);     //NSLog(@"Product id: %@" ,[myProduct[i] productIdentifier]);       myDict = [NSDictionary dictionaryWithObjectsAndKeys:                     [myProduct[i] localizedTitle], @"title",                     [myProduct[i] localizedDescription], @"desc",                     [myProduct[i] price], @"price",                     [myProduct[i] productIdentifier], @"product", nil];       [dict setValue: myDict forKey: [myProduct[i] productIdentifier]]; } if([NSJSONSerialization isValidJSONObject:dict]) {     NSError* error;     NSData *str = [NSJSONSerialization dataWithJSONObject:dict                         options:kNilOptions error:&error];     NSLog(@"Result: %@",[[NSString alloc]initWithData:str                             encoding:NSUTF8StringEncoding]); } else {     NSLog(@"An error happened while serializing the JSON data."); }

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