Recursively walks a UIView's subview hierarchy looking for a view of the given kind. Any time we find a view of that kind, we execute the given block, passing in the view we found.

UIView+RecursiveSubviews.h

//
//  UIView+RecursiveSubviews.h
//
//  Created by Scott Jackson on 6/12/2013.
//

#import <UIKit/UIKit.h>

@interface UIView (RecursiveSubviews)

/**
 Recursively looks at a view's subview hierarchy and executes the given block on each subview of the given class that's found.
 
 @param class: the class of the subview you're trying to find
 @param block: the block to perform when we've found a subview of the given class. Takes one parameter (a subview that was found in the search that's of the type you're looking for).
 */
- (void)findSubviewsOfType:(Class)class andExecuteBlock:(void (^)(id subview))block;

@end

UIView+RecursiveSubviews.m

//
//  UIView+RecursiveSubviews.m
//
//  Created by Scott Jackson on 6/12/2013.
//

#import "UIView+RecursiveSubviews.h"

@implementation UIView (RecursiveSubviews)

#pragma mark - Public

- (void)findSubviewsOfType:(Class)class andExecuteBlock:(void (^)(id subview))block {
    [self findSubviewsOfType:class inSubviewHierarchyOfView:self andExecuteBlock:block];
}

#pragma mark - Private

- (void)findSubviewsOfType:(Class)class inSubviewHierarchyOfView:(UIView *)rootView andExecuteBlock:(void (^)(id subview))block {
    for (UIView *v in rootView.subviews) {
        if ([v isKindOfClass:class]) {
            if (block) {
                block(v);
            }
        }
        [self findSubviewsOfType:class inSubviewHierarchyOfView:v andExecuteBlock:block];
    }
}

@end