Recursive way to find the first responder

Find First Responder Recursively

// ************************************************************ // 
// UIResponder+FirstResponder.h 
// ************************************************************ // 

@interface UIResponder (FirstResponder)

+ (UIResponder*)firstResponder;

@end

// ************************************************************ // 
// UIResponder+FirstResponder.m
// ************************************************************ // 

#import "UIResponder+FirstResponder.h"

@interface UIView (FindFirstResponder)

- (UIView*)findFirstResponder;

@end

@interface UIViewController (FindFirstResponder)

- (id)findFirstResponder;

@end


@implementation UIView (FindFirstResponder)

- (UIView *)findFirstResponder
{
    if (self.isFirstResponder)
        return self;
    
    for (UIView *subView in self.subviews)
    {
        UIView *firstResponder = [subView findFirstResponder];
        
        if (firstResponder != nil)
            return firstResponder;
    }
    
    return nil;
}

@end

@implementation UIViewController (FindFirstResponder)

- (id)findFirstResponder
{
    if (self.isFirstResponder)
        return self;
    
    id firstResponder = [self.view findFirstResponder];
    
    if (firstResponder != nil)
        return firstResponder;
    
    for (UIViewController *childViewController in self.childViewControllers)
    {
        firstResponder = [childViewController findFirstResponder];
        
        if (firstResponder != nil)
            return firstResponder;
    }
    
    return nil;
}

@end

@implementation UIResponder (FirstResponder)

+ (UIResponder*)firstResponder
{
    NSArray *windows = [[UIApplication sharedApplication] windows];
    
    for (UIWindow *window in [windows copy])
    {
        if ([window isFirstResponder])
            return window;
        
        id firstResponder = [window.rootViewController findFirstResponder];
        if (firstResponder)
            return firstResponder;
    }
    
    return nil;
}

@end