将网络请求的返回的空数据所有NSNull类型转化成@""，利用递归的思想，查找“<null>”,替换为@“”
+(id)changeType:(id)myObj
{
if ([myObj isKindOfClass:[NSDictionary class]])
{
return [self nullDic:myObj];
}
else if([myObj isKindOfClass:[NSArray class]])
{
return [self nullArr:myObj];
}
else if([myObj isKindOfClass:[NSString class]])
{
return [self stringToString:myObj];
}
else if([myObj isKindOfClass:[NSNull class]])
{
return [self nullToString];
}
else
{
return myObj;
}
}
使用方法：
NSDictionary *dic = (NSDictionary*)responseObject;
NSDictionary *newDic = [NSDictionary changeType:dic];
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