iOS開発中のキーボード高度変化処理

転載:http://blog.unieagle.net/2012/06/04/ios開発中のキーボードの高度変化処理/
ios開発ではキーボードがよく使われています.sdkバージョン5.0の前に、キーボードの高さは固定値216 pxである.5.0が出てきたら、キーボードの高さはキーボード言語によって変化します.この場合、一般的にはインタフェースの再配置が必要です.方法はNSNotificationCenterを利用することです.

UIKeyboardWillShowNotification;
UIKeyboardDidShowNotification; 
UIKeyboardWillHideNotification; 
UIKeyboardDidHideNotification;

これらのnotificationは5.0 sdk前からあって、名前の通り意味が分かります.

UIKeyboardWillChangeFrameNotification  __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);
UIKeyboardDidChangeFrameNotification   __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0);

この二つはsdk 5.0以降に出てきたもので、キーボードの高さの変化を処理します.
使い方は、まずnotificationに観察者を登録します.例えば、

if([[[UIDevice currentDevice] systemVersion] floatValue] >= 5.0) {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}

キーボードの高さが変わると、通知を受けます.キーボードの現在の高さと変化の目標高さを教えてくれます.

-(void)keyboardWillChangeFrame:(NSNotification*)notif{
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_3_2  
    NSValue *keyboardBoundsValue = [[notif userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];  
#else  
    NSValue *keyboardBoundsValue = [[notif userInfo] objectForKey:UIKeyboardBoundsUserInfoKey];  
#endif
    CGRect keyboardEndRect = [keyboardBoundsValue CGRectValue];
    CGRect inputFrame = self.feedBackTextView.frame;
    //kb 216 vs textFrame 185
    float delta = keyboardEndRect.size.height - 216;
    float originalHeight = inputFrame.size.height;
    inputFrame.size.height = 185 - delta;
    if (inputFrame.size.height != originalHeight) {
        self.feedBackTextView.frame = inputFrame;
        self.feedBackBackgroundView.frame = inputFrame;
    }
}

他のいくつかのnotifications.userInfoから取得できるkeyは以下の通りです.

UIKeyboardFrameBeginUserInfoKey        // NSValue of CGRect
UIKeyboardFrameEndUserInfoKey          // NSValue of CGRect
UIKeyboardAnimationDurationUserInfoKey // NSNumber of double
UIKeyboardAnimationCurveUserInfoKey    // NSNumber of double

notifにおけるuserInfoの完全情報は以下の通りである.

keyboardChange:{
    UIKeyboardAnimationCurveUserInfoKey = 0;
    UIKeyboardAnimationDurationUserInfoKey = "0.25";
    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {320, 216}}";
    UIKeyboardCenterBeginUserInfoKey = "NSPoint: {160, 372}";
    UIKeyboardCenterEndUserInfoKey = "NSPoint: {160, 588}";
    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 264}, {320, 216}}";
    UIKeyboardFrameChangedByUserInteraction = 0;
    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 480}, {320, 216}}";
}

以下は完全なソリューションです.ユーザーはキーボードの高さの入念な変化を知る必要があります.

#pragma mark Keyboard
-(void)keyboardWillChangeFrame:(NSNotification*)notif{
    NSLog(@"keyboardChange:%@",[notif userInfo]);
    float keyboadHeightBegin = 0;
    float keyboadHeightEnd = 0;
    float animationDuration = [[[notif userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    UIViewAnimationCurve animationCurve = [[[notif userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue];
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_3_2
    CGRect keyboardBeginFrame = [[[notif userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGRect keyboardEndFrame = [[[notif userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    keyboadHeightBegin = 480 - keyboardBeginFrame.origin.y;
    keyboadHeightEnd = 480 - keyboardEndFrame.origin.y;
#else
    //these deprecated after iOS 3.2
    CGRect keyboardBounds = [[[notif userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue];
    CGPoint keybordCenterBegin = [[[notif userInfo] objectForKey:UIKeyboardCenterBeginUserInfoKey] CGPointValue];
    CGPoint keybordCenterEnd = [[[notif userInfo] objectForKey:UIKeyboardCenterEndUserInfoKey] CGPointValue];
    keyboadHeightBegin = 480 - (keybordCenterBegin.y - keyboardBounds.size.height / 2);
    keyboadHeightEnd = 480 - (keybordCenterEnd.y - keyboardBounds.size.height / 2);
#endif
    NSLog(@"keyboardHeightChangeFrom:%.2f,To:%.2f",keyboadHeightBegin,keyboadHeightEnd);
    return;
    if (keyboadHeightEnd > 0) {
        //keyboard show or change frame
        [UIView animateWithDuration:animationDuration delay:0 options:animationCurve animations:^{
        } completion:^(BOOL finished) {
        }];
    } else {
        //keyboard hide
    }
}
-(void)keyboardDidChangeFrame:(NSNotification*)notif{
    //info like willChangeFrame
}
-(void)keyboardWillShow:(NSNotification*)notif{
    //keyboard height will be 216, on iOS version older than 5.0
    [UIView animateWithDuration:0.3f animations:^{
        self.contentTableView.height = 480 - 44 - 216;
    }];
}
-(void)keyboardWillHide:(NSNotification*)notif{
    [UIView animateWithDuration:0.3f animations:^{
        self.contentTableView.height = 480 - 44 - 28;
    }];
}
-(void)registerKeyboardEvent{
    float systemVer = [[[UIDevice currentDevice] systemVersion] floatValue];
    if(systemVer >= 5.0) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidChangeFrame:) name:UIKeyboardDidChangeFrameNotification object:nil];
    } else {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    }
}
-(void)unregisterKeyboardEvent{
    if([[[UIDevice currentDevice] systemVersion] floatValue] > 5.0) {
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidChangeFrameNotification object:nil];
    } else {
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];        
    }
}

以下の解決策はキーボードの出現と消失の処理だけを考えます.

#pragma mark Keyboard
-(void)keyboardWillShow:(NSNotification*)notif{
    //keyboard height will be 216, on iOS version older than 5.0
    CGRect boxFrame = self.loginBoxView.frame;
    boxFrame.origin.y = 50;
    [UIView animateWithDuration:0.3f animations:^{
        self.loginBoxView.frame = boxFrame;
    }];
}
-(void)keyboardWillHide:(NSNotification*)notif{
    CGRect boxFrame = self.loginBoxView.frame;
    boxFrame.origin.y = 216;
    [UIView animateWithDuration:0.3f animations:^{
        self.loginBoxView.frame = boxFrame;
    }];
}
// viewdidload   
-(void)registerKeyboardEvent{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}
// viewdidunload   
-(void)unregisterKeyboardEvent{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
}