ios根据键盘类型自适应高度

注册一个

UIKeyboardWillChangeFrameNotification类型的通知。 当键盘状态改变的时候 会调用该通知类型的响应方法。

定义一个变量用来保存上一次键盘输入结束的高度，比如代码中得 lastKeyboardHight。然后与新的高度进行相减。差额为键盘类型改变时的高度差。lastKeyboardHight初始化为0。

[[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWasShown:)name:UIKeyboardWillChangeFrameNotificationobject:nil];

- (void) keyboardWasShown:(NSNotification *) notif

{

    NSDictionary *info = [notif userInfo];

    NSValue *value = [infoobjectForKey:UIKeyboardFrameBeginUserInfoKey];

    CGSize keyboardSize = [value CGRectValue].size;

    

    CGRect endKeyboardRect = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    

    CGFloat yOffset = lastKeyboardHight - endKeyboardRect.size.height;

    CGRect frame = bottomView.frame;

    frame.origin.y += yOffset;

    bottomView.frame = frame;

    lastKeyboardHight = endKeyboardRect.size.height;

}