Question

In a project (XCode 4, iOS 5, with ARC) I have a subclass of UIView with a boolean property:

 // Diagram.h
 @interface Diagram : UIView 
 @property (assign) BOOL  flag;
 @end

 // Diagram.m
 @implementation Diagram
 @synthesize flag; 
 ...

In the main view controller:

 // ViewController.h
 @property (nonatomic, strong) IBOutlet Diagram *schema;
 ...

 // ViewController.m
 @synthesize schema;
 ...
 schema.flag = NO;
 ...

The last line causes this error:

 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setFlag:]: unrecognized selector sent to instance 0xb07e660'

Any help?

Thank you.

Answer 1

Found it!

Diagram.m was not listed in target > Build Phases > Compile Sources.