[App management 04-Bug correction Objective-C language]

1. We have just finished this for everyone, right?

1. How does this Label display on the top,

Let's add it to the View of our controller now.

Let's take a look at how this coordinate is calculated, come on, let's find a coordinate,

Should we use the frame of this View to subtract our coordinates?

Come on, let's be here, output this Frame, let's take a look

In this sentence of CGRectMake, the following

NSLog（@“%@”，lblMsg.frame）；

Oh, something is missing, you can’t print like this directly, what should I do?

NSLog（@“%@”，NSStringFromCGRect（））；

write this in

NSLog（@“%@”，NSStringFromCGRect（lblMsg.frame））；

command + R

Now, here is 60, X is 60, Y is 225, no problem,

Well, when scrolling up,

rolled over here,

X is 60, Y is 225

Come on, let's see, where is it added now, it's added to the View of the controller, right?

Our current View, isn’t it because what we use here is a TableViewController

TableViewController is used, so we add this Label directly to self.view