Question

I have a UIButton which calls a method from another UIViewController, that method calls a delegate method which is not happening.

Something like:

FirstViewController

-(void)viewWillAppear:(BOOL)animated {
//Submit Button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button addTarget:self 
               action:@selector(someMethod)
     forControlEvents:UIControlEventTouchDown];
    [button setTitle:@"Submit" forState:UIControlStateNormal];
    button.frame = CGRectMake(100.0, 120.0, 80.0, 40.0);
    [self addSubview:button];
}

- (void)someMethod {

 SecondViewController *viewC = [[SecondViewController alloc] init];
 [viewC otherMethod];

} 

SecondViewController

- (void)otherMethod {

 NSLog(@"Verification.....");
 [self.delegate foo:self Bar:self.text]; //not working when called the otherMethod from FirstViewController

} 

I know I’m doing it wrong way.

Answer 1

A very simple example of the way protocols and delegates work in objective-c

@class A;
@protocol DelegateName<NSObject>
@optional
  - (void)doSomething:(NSString *)text;
@end

@interface A: NSObject {
    NSString *bar;
    id <DelegateName> delegate;
}

@property (nonatomic, retain) NSString *bar;
@property (nonatomic, assign) id <DelegateName> delegate;

- (void)someAction;

@end

This is your protocol declaration.
Then when you are calling the delegate method, you need an object of the class to invoke the delegate method. In your case it is vc. You set delegate like this:

[vc setdelegate: self];

Then you invoke method, like you have done.

See if you are missing any point from this example.