Objective-C Json 实例详解
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." ); } |
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原文链接:http://blog.csdn.net/fansongy/article/details/40919425