您的位置：首页 > 移动开发 > IOS开发

ios5 支持 json 转化

2012-08-17 17:00 197 查看

解析json成dic对象

-(void)fetchedData:(NSData*)responseData {//parse out the json dataNSError* error;

NSDictionary* json =[NSJSONSerialization

JSONObjectWithData:responseData //1

options:kNilOptions

error:&error];

NSArray* latestLoans =[json objectForKey:@"loans"]; //2

NSLog(@"loans: %@", latestLoans); //3

}

把对象生成json string

//build an info object and convert to json

NSDictionary* info =[NSDictionary dictionaryWithObjectsAndKeys:[loan objectForKey:@"name"],

@"who",

[(NSDictionary*)[loan objectForKey:@"location"]

objectForKey:@"country"],

@"where",

[NSNumber numberWithFloat: outstandingAmount],

@"what",

nil];

//convert object to data

NSData* jsonData =[NSJSONSerialization dataWithJSONObject:info

options:NSJSONWritingPrettyPrinted error:&error];

//print out the data contents

jsonSummary.text =[[NSString alloc] initWithData:jsonData

encoding:NSUTF8StringEncoding];

添加json方法至dic

@interfaceNSDictionary(JSONCategories)

+(NSDictionary*)dictionaryWithContentsOfJSONURLString:(NSString*)urlAddress;

-(NSData*)toJSON;

@end

@implementationNSDictionary(JSONCategories)

+(NSDictionary*)dictionaryWithContentsOfJSONURLString:(NSString*)urlAddress{

NSData* data =[NSData dataWithContentsOfURL:[NSURL URLWithString: urlAddress]];

__autoreleasing NSError* error =nil;

id result =[NSJSONSerialization JSONObjectWithData:data

options:kNilOptions error:&error];

if(error !=nil)returnnil;

return result;

}

-(NSData*)toJSON{

NSError* error =nil;

id result =[NSJSONSerialization dataWithJSONObject:self

options:kNilOptions error:&error];

if(error !=nil)returnnil;

return result;

}@end

使用列子

NSDictionary* myInfo =[NSDictionary dictionaryWithContentsOfJSONURLString:@"http://www.yahoo.com/news.json"];

NSDictionary* information =[NSDictionary dictionaryWithObjectsAndKeys:@"orange",@"apple",@"banana",@"fig",nil];

NSData* json =[information toJSON];

判断是否可json化

BOOL isTurnableToJSON =[NSJSONSerialization isValidJSONObject: object]

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航