DLR.m

- (NSArray*)findAllLabelsOfView:(UIView*)view{
    NSMutableArray *array = [NSMutableArray array];
    NSArray *subViews = view.subviews;
    if ([view isKindOfClass:[UILabel class]]) {
        [array addObject:view];
    }
    if (subViews.count) {
        [subViews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            [array addObjectsFromArray:[self findAllLabelsOfView:obj]];
        }];
    }
    return array;
}