Category for check if keyboard is open.

UIWindow+KeyBoard.h

#import <UIKit/UIKit.h>

@interface UIWindow (KeyBoard)

+ (BOOL)isKeyBoardInDisplay;

@end

UIWindow+KeyBoard.m

#import "UIWindow+KeyBoard.h"

@implementation UIWindow (KeyBoard)

+ (BOOL)isKeyBoardInDisplay {

    BOOL isExists = NO;
    for (UIWindow *keyboardWindow in [[UIApplication sharedApplication] windows])   {
        if ([[keyboardWindow description] hasPrefix:@"<UITextEffectsWindow"] == YES) {
            isExists = YES;
        }
    }

    return isExists;
}

@end