如何在iPhone sdk中比较数据

我正在使用条件，但它不会转到if条件，每次都转到else条件

 if ([[dict2 valueForKey:@"meeting_location"] isEqual:@""])
    {
        lbllocation.text = @"-----";

    }
    else
    {
        lbllocation.text = [NSString stringWithFormat:@"Location: %@",[dict2 valueForKey:@"meeting_location"]];

    }

输出来自Webservice：-

        "meeting_location" = "";
        "meeting_time" = "";
        "meeting_with" = "";

---

使用以下代码-

 if ([[dict2 valueForKey:@"meeting_location"] length] == 0)
{
    lbllocation.text = @"-----";
}
else
{
    lbllocation.text = [NSString stringWithFormat:@"Location: %@",[dict2 valueForKey:@"meeting_location"]];

}

---

希望这能在这里起作用。

使用下面的代码

 if ([[dict2 valueForKey:@"meeting_location"] length] == 0)
{
    lbllocation.text = @"-----";
}
else
{
    lbllocation.text = [NSString stringWithFormat:@"Location: %@",[dict2 valueForKey:@"meeting_location"]];

}

希望这能在这里起作用