iOS 键盘高度 iphone键盘设置高度

IPAD键盘高度:

portrait  264

landscape  352.

iPhone键盘高度:

Portrait  216

Landscape  140

背景：

　　ios5之前，iphone上的键盘的高度是固定为216.0px高的，中文汉字的选择框是悬浮的，所以不少应用都将此高度来标注键盘的高度。

　　可是在ios5中，键盘布局变了，尤其是中文输入时，中文汉字选择框就固定在键盘上方，这样就使得原本与键盘紧密贴合的界面视图被中文汉字选择框给覆盖住了。一方面影响了界面的美观，另一方面，如果被覆盖的部分就是文本输入框的话，用户就无法看到输入的内容了。因此这个问题就必须得解决了。

解决方法：

KeyboardAccessory”。

　　处理键盘事件的正确方法是这样的：（包括获取键盘的高度以及键盘弹出和消失动画的时间）

　　1）在要使用键盘的视图控制器中，接收键盘事件的通知：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

// 键盘高度变化通知，ios5.0新增的  
#ifdef __IPHONE_5_0
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 5.0) {
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];
        }
#endif

　　2）然后添加键盘事件的处理代码：

　　　　获取到当前keyboard的高度以及动画时间，然后对视图进行对应的操作即可。

#pragma mark -
#pragma mark Responding to keyboard events
- (void)keyboardWillShow:(NSNotification *)notification {

/*
     Reduce the size of the text view so that it's not obscured by the keyboard.
     Animate the resize so that it's in sync with the appearance of the keyboard.
*/

    NSDictionary *userInfo = [notification userInfo];

// Get the origin of the keyboard when it's displayed.
    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

// Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
    CGRect keyboardRect = [aValue CGRectValue];

// Get the duration of the animation.
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

// Animate the resize of the text view's frame in sync with the keyboard's appearance.
    [self moveInputBarWithKeyboardHeight:keyboardRect.size.height withDuration:animationDuration];
}


- (void)keyboardWillHide:(NSNotification *)notification {

    NSDictionary* userInfo = [notification userInfo];

/*
     Restore the size of the text view (fill self's view).
     Animate the resize so that it's in sync with the disappearance of the keyboard.
*/
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

    [self moveInputBarWithKeyboardHeight:0.0 withDuration:animationDuration];
}

　　3）在视图控制器消除时，移除键盘事件的通知：

[[NSNotificationCenter defaultCenter] removeObserver:self];

ps:

　　ios5隐藏功能分享——“字典”功能（英英字典）：

　　在任何输入框中选中一个英文单词，此时会有选择项“复制”，“删除”...等，还有一个向右的箭头，点击这个向右的箭头后，就会出现“定义”选项，点击这个“定义”按钮即会弹出这个英语单词的英文解释。

动态获取keyboard大小：

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //增加监听，当键盘出现或改变时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    //增加监听，当键退出时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    
}

//当键盘出现或改变时调用
- (void)keyboardWillShow:(NSNotification *)aNotification
{
    //获取键盘的高度
    NSDictionary *userInfo = [aNotification userInfo];
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    int height = keyboardRect.size.height;
}

//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification
{
    
}

动态调整输入框的位置：

实现方法：

   1）将输入框的代理设置为self

       （在lb文件中将输入框的delegate设置为File’s Owner 。或者使用代码textField.delegate = self;

   2）将输入框所对应的ViewController.h设置实现了UITextFieldDelegate协议

         在ViewController.m文件中实现UITextFieldDelegate的三个方法即可：

/开始编辑输入框的时候，软键盘出现，执行此事件 
-(void)textFieldDidBeginEditing:(UITextField *)textField 
{ 
    CGRect frame = textField.frame; 
    int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//键盘高度216 
     
    NSTimeInterval animationDuration = 0.30f; 
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil]; 
    [UIView setAnimationDuration:animationDuration]; 
     
    //将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示 
    if(offset > 0) 
        self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height); 
     
    [UIView commitAnimations]; 
} 
 
//当用户按下return键或者按回车键，keyboard消失 
-(BOOL)textFieldShouldReturn:(UITextField *)textField 
{ 
    [textField resignFirstResponder]; 
    return YES; 
} 
 
//输入框编辑完成以后，将视图恢复到原始状态 
-(void)textFieldDidEndEditing:(UITextField *)textField 
{ 
    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height); 
}

该方法不适用于，当前页面多个输入框的情况，需要修改