The following code (sorry for the length) displays an odd behavior under iOS 4.3 (maybe others version too). In this example, there are three UITextFields that have three different sized keyboards. If you start editing one text field and then touch "return" dismissing the keyboard, each time the keyboard size is returned correctly in UIKeyboardWillShowNotification and UIKeyboardDidShowNotification using UIKeyboardFrameBeginUserInfoKey.

see below:

- (void) keyboardWillShowNotification:(NSNotification *)aNotification

and

- (void) keyboardDidShowNotification:(NSNotification *)aNotification

Note that this is the expected behavior.

action                 reported keyboard size  expected keyboard size

-----------------------------------------------------------------

touch one    &return100100

touch two    &return200200

touch normal &return216216

n            &return  keyboard size(n)        keyboard size(n)

The unexpected behavior is if you start editing a text field the size of the first keyboard is reported (expected). When you touch the second text field (without touching return), the size of first keyboard is reported (unexpected) instead of the size of the second. When you touch the third text field (without touching return), the size of the second keyboard size is reported (unexpected) instead of the size of the third. For the second to nth times, it seems like it is reporting the previous keyboard's size not the one that will be displayed.

action        reported keyboard size  expected keyboard size

--------------------------------------------------------

touch one     100100

touch two     100200

touch normal  200216

touch one     216100

n             keyboard size(n-1)      keyboard size(n)

Before I send in a bug report, I just want to make sure that I have not over looked anything.

FYI I stubbled upon this while trying to do the right thing (using UIKeyboardWillShowNotification or UIKeyboardDidShowNotification and UIKeyboardFrameBeginUserInfoKey to get the keyboard's size) when shifting a view so that a text field that would have been obscured by a keyboard is visible. Reference:

How to make a UITextField move up when keyboard is present

iOS Library: Text, Web, and Editing Programming Guide for iOS --> Managing the Keyboard

iOS Library: Scroll View Programming Guide for iOS --> Creating and Configuring Scroll Views

BugVC.h

#import <UIKit/UIKit.h>@interfaceBugVC:UIViewController<UITextFieldDelegate>{UITextField*oneTF;UITextField*twoTF;UITextField*normalTF;UILabel*keyboardWillShowNotificationL;UILabel*keyboardDidShowNotificationL;}-(void) oneReturnTouchDown:(id)sender;-(void) twoReturnTouchDown:(id)sneder;-(void) keyboardWillShowNotification:(NSNotification*)aNotification;-(void) keyboardDidShowNotification:(NSNotification*)aNotification;@end

BugVC.m

#import "BugVC.h"@implementationBugVC-(id) init

{if(!(self=[super init])){returnself;}// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// One text field with 100 height keyboard

    oneTF =[[UITextField alloc] initWithFrame:CGRectMake(10,10,300,30)];

    oneTF.borderStyle =UITextBorderStyleRoundedRect;

    oneTF.text =@"100";

    oneTF.delegate=self;// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -// Custom input view for the above text fieldUIView*oneInputView =[[UIView alloc] initWithFrame:CGRectMake(0,0,320,100)];

    oneInputView.backgroundColor =[UIColor redColor];UIButton*oneReturnB =[UIButton buttonWithType:UIButtonTypeRoundedRect];

    oneReturnB.frame =CGRectMake(10,10,300,30);[oneReturnB setTitle:@"return" forState:UIControlStateNormal];[oneReturnB addTarget:self

                   action:@selector(oneReturnTouchDown:)

         forControlEvents:UIControlEventTouchDown];[oneInputView addSubview:oneReturnB];

    oneTF.inputView = oneInputView;[oneInputView release];[self.view addSubview:oneTF];// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// Two text field with 200 height keyboard

    twoTF =[[UITextField alloc] initWithFrame:CGRectMake(10,50,300,30)];

    twoTF.borderStyle =UITextBorderStyleRoundedRect;

    twoTF.text =@"200";

    twoTF.delegate=self;// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -// Custom input view for the above text fieldUIView*twoInputView =[[UIView alloc] initWithFrame:CGRectMake(0,0,320,200)];

    twoInputView.backgroundColor =[UIColor blueColor];UIButton*twoReturnB =[UIButton buttonWithType:UIButtonTypeRoundedRect];

    twoReturnB.frame =CGRectMake(10,10,300,30);[twoReturnB setTitle:@"return" forState:UIControlStateNormal];[twoReturnB addTarget:self

                   action:@selector(twoReturnTouchDown:)

         forControlEvents:UIControlEventTouchDown];[twoInputView addSubview:twoReturnB];

    twoTF.inputView = twoInputView;[twoInputView release];[self.view addSubview:twoTF];// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// normal text field with normal keyboard (216 height keyboard)

    normalTF =[[UITextField alloc] initWithFrame:CGRectMake(10,90,300,30)];

    normalTF.borderStyle =UITextBorderStyleRoundedRect;

    normalTF.text =@"normal";

    normalTF.delegate=self;[self.view addSubview:normalTF];// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// Label that displays the keyboard height from keyboardWillShowNotification

    keyboardWillShowNotificationL =[[UILabel alloc] initWithFrame:CGRectMake(10,130,300,30)];

    keyboardWillShowNotificationL.font =[UIFont systemFontOfSize:14];

    keyboardWillShowNotificationL.text =@"keyboardWillShowNotification kbHeight:";[self.view addSubview:keyboardWillShowNotificationL];// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// Label that displays the keyboard height from keyboardDidShowNotification

    keyboardDidShowNotificationL =[[UILabel alloc] initWithFrame:CGRectMake(10,170,300,30)];

    keyboardDidShowNotificationL.font =[UIFont systemFontOfSize:14];

    keyboardDidShowNotificationL.text =@"keyboardDidShowNotification kbHeight:";[self.view addSubview:keyboardDidShowNotificationL];// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// Register for keyboard notifications.[[NSNotificationCenter defaultCenter]

     addObserver:self

        selector:@selector(keyboardWillShowNotification:)

            name:UIKeyboardWillShowNotificationobject:nil];[[NSNotificationCenter defaultCenter]

     addObserver:self

        selector:@selector(keyboardDidShowNotification:)

            name:UIKeyboardDidShowNotificationobject:nil];returnself;}-(void) dealloc

{// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =// Deregister for keyboard notifications[[NSNotificationCenter defaultCenter]

     removeObserver:self

               name:UIKeyboardWillShowNotificationobject:nil];[[NSNotificationCenter defaultCenter]

     removeObserver:self

               name:UIKeyboardDidShowNotificationobject:nil];[oneTF release];[twoTF release];[normalTF release];[keyboardWillShowNotificationL release];[keyboardDidShowNotificationL release];[super dealloc];}-(BOOL) textFieldShouldReturn:(UITextField*)textField

{[textField resignFirstResponder];return YES;}-(void) oneReturnTouchDown:(id)sender

{[oneTF.delegate textFieldShouldReturn:oneTF];}-(void) twoReturnTouchDown:(id)sneder

{[twoTF.delegate textFieldShouldReturn:twoTF];}-(void) keyboardWillShowNotification:(NSNotification*)aNotification

{NSDictionary*info =[aNotification userInfo];CGFloat kbHeight =[[info objectForKey:UIKeyboardFrameBeginUserInfoKey]CGRectValue].size.height;NSString*string=[[NSString alloc] initWithFormat:@"keyboardWillShowNotification kbHeight: %.2f", kbHeight];NSLog(@"%@",string);

    keyboardWillShowNotificationL.text =string;[string release];}-(void) keyboardDidShowNotification:(NSNotification*)aNotification

{NSDictionary*info =[aNotification userInfo];CGFloat kbHeight =[[info objectForKey:UIKeyboardFrameBeginUserInfoKey]CGRectValue].size.height;NSString*string=[[NSString alloc] initWithFormat:@"keyboardDidShowNotification kbHeight: %.2f", kbHeight];NSLog(@"%@",string);

    keyboardDidShowNotificationL.text =string;[string release];}@end