Recursively find a subview.

UIView+Recursion.h

#import <UIKit/UIKit.h>

@interface UIView (Recursion)

/**
 Return YES from the block to recurse into the subview.
 Set stop to YES to return the subview.
 */
- (UIView*)findViewRecursively:(BOOL(^)(UIView* subview, BOOL* stop))recurse;

@end

UIView+Recursion.m

#import "UIView+Recursion.h"

@implementation UIView (Recursion)

- (UIView*)findViewRecursively:(BOOL(^)(UIView* subview, BOOL* stop))recurse
{
    for( UIView* subview in self.subviews ) {
        BOOL stop = NO;
        if( recurse( subview, &stop ) ) {
            return [subview findViewRecursively:recurse];
        } else if( stop ) {
            return subview;
        }
    }
    
    return nil;
}

@end