macOS HELP wanted (CGRotation)

[ucool]

in apple cocoa sample code CGRotation, how SSlider connect with setRotation? anyone have idea?

 

[kainjow]

Through bindings. It is binded to "rotation"

View attachment 74471

 

[ucool]

In fact, i found in definition it is as:
...
{
float rotation;
}
- (void) setRotation: (float) r;
- (float) rotation;
...

And in Inteface Builder it bind the NSSlider to rotation

Usually in order to connect NSSlider and setRotation, I set
-(IBAction) setRotation: (float) r; and then connect NSSlider and setRotation in Inteface Builder

But in this sample, it does not do like this usual way. I think they configure something in Inteface Builder, but i dont know how.

 

[kainjow]

Read up on Bindings

 

[ucool]

Read up on Bindings

Thank you for your post. I knew now. It is a naming thing. I mean in my code, I have
float abc;
so I need
-(void ) setAbc: (float) a;

it is setAbc but setabc

I hate this in mac programming at this point. a typo can waste my a day.

Thank you again.

 

[kainjow]

Personally I don't like bindings, and that is just one of the reasons.

NSUserDefaultsController is the only part of bindings I use normally.