Objective-C Json 实例详解

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);

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.");}