iOS 对象转json格式

在调用接口的时候，我们经常碰到后端要求我们上传json格式的字典或者数组，那么可以使用下面的方法进行转换

-(NSString *)ChangeJsonWith:(id)object{

NSString *jsonStr= @"";

NSData *data=[NSJSONSerialization dataWithJSONObject:object options:NSJSONWritingPrettyPrinted error:nil];
jsonStr=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];

NSMutableString *mutStr = [NSMutableString stringWithString:jsonStr];
NSRange range = {0,jsonStr.length};
[mutStr replaceOccurrencesOfString:@" " withString:@"" options:NSLiteralSearch range:range];
NSRange range2 = {0,mutStr.length};
//去掉字符串中的换行符
[mutStr replaceOccurrencesOfString:@"\n" withString:@"" options:NSLiteralSearch range:range2];

return mutStr;

}

object 为数组或者字典对象