Find the first view of a given class in the iOS7 subviews hierarchy. iOS backward compatible.

UIView+ADBSubviews.h

//
//  UIView+ADBSubviews.h
//  iHarmony
//
//  Created by Alberto De Bortoli on 06/08/13.
//  Copyright (c) 2013 iHarmony. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIView (ADBSubviews)

/**
 *	Recursively search for and return a view of a given class in the subviews hierarchy of the receiver
 *  searching for it at 3 level max deepness.
 *
 *	@param	clazz	The given class.
 *
 *	@return	The first view of a given class found in the subviews hierarchy.
 */
- (id)firstSubviewOfClass:(Class)clazz;

/**
 *	Recursively search for and return a view of a given class in the subviews hierarchy of the receiver.
 *
 *	@param	clazz	The given class.
 *	@param	deepness	The max level of recursion.
 *
 *	@return	The first view of a given class found in the subviews hierarchy.
 */
- (id)firstSubviewOfClass:(Class)clazz maxDeepnessLevel:(NSInteger)deepness;

@end

UIView+ADBSubviews.m

//
//  UIView+ADBSubviews.m
//  iHarmony
//
//  Created by Alberto De Bortoli on 06/08/13.
//  Copyright (c) 2013 iHarmony. All rights reserved.
//

#import "UIView+ADBSubviews.h"

@implementation UIView (ADBSubviews)

- (id)firstSubviewOfClass:(Class)clazz
{
    return [self firstSubviewOfClass:clazz maxDeepnessLevel:3];
}

- (id)firstSubviewOfClass:(Class)clazz maxDeepnessLevel:(NSInteger)deepness
{
    if (deepness == 0) {
        return nil;
    }
    
    NSInteger count = deepness;

    NSArray *subviews = self.subviews;
    
    while (count > 0) {
        for (UIView *v in subviews) {
            if ([v isKindOfClass:clazz]) {
                return v;
            }
        }
        
        count--;
        
        for (UIView *v in subviews) {
            UIView *retVal = [v firstSubviewOfClass:clazz maxDeepnessLevel:count];
            if (retVal) {
                return retVal;
            }
        }
    }
    
    return nil;
}

@end

Explanation @ http://albertodebortoli.github.io/blog/2013/09/22/ios7-subviews-hierarchy/