使用选择器向UIButton添加操作时出错

Question

I'm trying to add an event to a UIbutton:

UIButton *btn = [[UIButton alloc] init];
[btn setBackgroundImage:[UIImage imageNamed:@"aa.png"] 
     forState:UIControlStateNormal];

[btn addTarget:self 
     action:@selector(Presed:)];

and I'm getting this warning :

"UIButtom may not respond to addTarget:action"

The interface I'm creating this button for inherits from CDVPlugin

what's wrong with my code?

Answer 1

you are calling a method that is not declared. it should be.

– addTarget:action:forControlEvents:

[btn addTarget:self action:@selector(Presed:) 
forControlEvents:UIControlEventTouchUpInside];