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
