How can I programmatically check whether a keyboard is present in iOS app?

…or take the easy way:

When you enter a textField, it becomes first responder and the keyboard appears. You can check the status of the keyboard with [myTextField isFirstResponder]. If it returns YES, then the the keyboard is active.

drawnonward's code is very close, but collides with UIKit's namespace and could be made easier to use.

@interface KeyboardStateListener : NSObject {    BOOL _isVisible;}+ (KeyboardStateListener *)sharedInstance;@property (nonatomic, readonly, getter=isVisible) BOOL visible;@endstatic KeyboardStateListener *sharedInstance;@implementation KeyboardStateListener+ (KeyboardStateListener *)sharedInstance{    return sharedInstance;}+ (void)load{    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];    sharedInstance = [[self alloc] init];    [pool release];}- (BOOL)isVisible{    return _isVisible;}- (void)didShow{    _isVisible = YES;}- (void)didHide{    _isVisible = NO;}- (id)init{    if ((self = [super init])) {        NSNotificationCenter *center = [NSNotificationCenter defaultCenter];        [center addObserver:self selector:@selector(didShow) name:UIKeyboardDidShowNotification object:nil];        [center addObserver:self selector:@selector(didHide) name:UIKeyboardWillHideNotification object:nil];    }    return self;}@end

Create a UIKeyboardListener when you know the keyboard is not visible, for example by calling [UIKeyboardListener shared] from applicationDidFinishLaunching.

@implementation UIKeyboardListener+ (UIKeyboardListener) shared {    static UIKeyboardListener sListener;        if ( nil == sListener ) sListener = [[UIKeyboardListener alloc] init];    return sListener;}-(id) init {    self = [super init];    if ( self ) {        NSNotificationCenter        *center = [NSNotificationCenter defaultCenter];        [center addObserver:self selector:@selector(noticeShowKeyboard:) name:UIKeyboardDidShowNotification object:nil];        [center addObserver:self selector:@selector(noticeHideKeyboard:) name:UIKeyboardWillHideNotification object:nil];    }    return self;}-(void) noticeShowKeyboard:(NSNotification *)inNotification {    _visible = true;}-(void) noticeHideKeyboard:(NSNotification *)inNotification {    _visible = false;}-(BOOL) isVisible {    return _visible;}@end