Chain Responder Debugging Methods

lddb

(lldb) po NBResponderChain()
$13 = 0x213dda70 <__NSArrayI 0x213dda70>(
<UIActionSheet: 0x11915160; frame = (0 231; 320 337); opaque = NO; layer = <CALayer: 0x222b9c30>>,
<UIView: 0x222c73b0; frame = (0 0; 320 568); opaque = NO; layer = <CALayer: 0x2229d2f0>>,
<UIView: 0x2229d340; frame = (0 0; 320 568); opaque = NO; layer = <CALayer: 0x2229d3a0>>,
<UIView: 0x11913dc0; frame = (0 0; 320 568); clipsToBounds = YES; layer = <CALayer: 0x2229d3d0>>,
<_UIAlertOverlayWindow: 0x2226d4e0; frame = (0 0; 320 568); layer = <UIWindowLayer: 0x11911900>>,
<UIApplication: 0xaa66b30>,
<BicycletteApplicationDelegate: 0xab78c60>
)

NBResponderChainUtilities.h

//
//  NBResponderChainUtilities.h
//  
//  Created by Nicolas @ bou.io on 19/04/13.
//

#import <UIKit/UIKit.h>

@interface UIView (NBResponderChainUtilities)
- (UIView*) nb_firstResponder; // Recurse into subviews to find one that responds YES to -isFirstResponder
@end

@interface UIApplication (NBResponderChainUtilities)
- (UIView*) nb_firstResponder; // in the -keyWindow
@end

@interface UIResponder (NBResponderChainUtilities)
- (NSArray*) nb_responderChain; // List the -nextResponder starting at the receiver
@end


UIView * NBFirstResponder(void); // in the app key window
NSArray * NBResponderChain(void);  // Starting at the first responder

NBResponderChainUtilities.m

//
//  NBResponderChainUtilities.m
//  
//  Created by Nicolas @ bou.io on 19/04/13.
//

#import "NBResponderChainUtilities.h"

@implementation UIView (NBResponderChainUtilities)
- (UIView*) nb_firstResponder
{
    if ([self isFirstResponder]){
        return self;
    }
    
    for (UIView *subView in self.subviews)
    {
        UIView *firstResponder = [subView nb_firstResponder];
        if (firstResponder != nil)
        {
            return firstResponder;
        }
    }
    return nil;
}
@end

@implementation UIApplication (NBResponderChainUtilities)
- (UIView*) nb_firstResponder
{
    return [[self keyWindow] nb_firstResponder];
}
@end

@implementation UIResponder (NBResponderChainUtilities)
- (NSArray*) nb_responderChain
{
    return [@[self] arrayByAddingObjectsFromArray:[self.nextResponder nb_responderChain]];
}
@end

UIView * NBFirstResponder(void)
{
    return [[UIApplication sharedApplication] nb_firstResponder];
}

NSArray * NBResponderChain(void)
{
    return [NBFirstResponder() nb_responderChain];
}