ObjectiveC:Is possible to set global button(not in the class) to activate global method directly?

问题

Just like the question said. Is possible to set global button(not in the class) to activate global method directly? I confused on setting target and action part.

import "Global.h"

void methodA() 
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundRect];
    button.frame = CGRectMake(0,441,100,30);
    [button addTarget:??? action@selector(methodB????) forControlEvent...];
}

void methodB()
{
}
//end of file

回答1:

What you are trying to do is set up a nil-targeted action that works with the Responder Chain.

Have a read about it in the iOS Core Competencies documentation.

来源：https://stackoverflow.com/questions/6518315/objectivecis-possible-to-set-global-buttonnot-in-the-class-to-activate-global