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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