How to call a UIViewController property in custom uiview?

Question

I have a AVAudioPlayer property in my viewController and I want to draw a circle in my custom uiview if the music is playing.

in my MyViewController.h:

@property (strong, nonatomic) AVAudioPlayer *audio;

in my view.h

- (void) drawCircle
{

//DRAW Circle
}

now i want to check in my View.m if the audio is playing.

i tried to add the following in my View.h

@property (nonatomic, assign) MyViewController *ViewController_audio;

and then do if ([ViewController_audio _audio].playing) { } in

but it didn't work.

Answer 1

Your syntax is wrong. Get rid of the underscore:

if ([ViewController_audio audio].playing)

or

if (ViewController_audio.audio.playing)

Either syntax is valid.

PS "...it didn't work" is supremely unhelpful. Always explain what happens. In your case, I'm assuming that you got a compiler error. So copy and paste the full text of the compiler error, and explicitly tell the line on which it occurs.

Answer 2

A view should not have a reference to view controller. This is a bad design. Instead you should have a flag in view which will be set by your view controller when its playing. The view will read this property & take ui decisions.

From design prospective i would suggest that no decisions should be left to view. It is view controller who has right to think, a view should only display.