Objective-C Json 使用，objective-cjson

Objective-C Json 使用，objective-cjson

Objective-c json

通过使用NSJSONSerialization 可以Json与Foundation的相互转换。下面具体介绍 Objective-c json 的使用。

Json To Fundation

使用 JSONObjectWithData 可以将 Json 转化为 Foundation。Json的顶层可以是{} 或 []因此可以有 NSDictionary 和 NSArray 两种格式。读取使用 ObjectForKey 返回对应的对象。

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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 可以将 Fundation 转换为 Json。其中 options:NSJSONWritingPrettyPrinted 是分行输出json ,无空格输出使用 option:kNilOptions。

下面这段代码是IOS内购获取商品列表。获取后，将内容添加到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.");}

本篇博客出自阿修罗道，转载请注明出处，禁止用于商业用途：http://blog.csdn.net/fansongy/article/details/40919425