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);
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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