iOS 监听键盘高度，输入框上升

 1 //设置输入框 ---《因为输入框用了get方法，所以第一次调用输入框要用self 调用》；

 2     self.textlab.frame=CGRectMake(20, 420, 250, 30);
 3     _textlab.layer.borderColor=[UIColor blueColor].CGColor;
 4     _textlab.layer.borderWidth= 0.5f;
 5     _textlab.backgroundColor=[UIColor colorWithRed:0.830 green:0.801 blue:0.881 alpha:1.000];
 6     
 7     //添加输入框到视图
 8     [self.view addSubview:self.textlab];
 9     
10     //监听键盘，键盘出现
11     [[NSNotificationCenter defaultCenter]addObserver:self 
                                               selector:@selector(keyboardwill:) 
                                                   name:UIKeyboardWillShowNotification object:nil];
12 
13     //监听键盘隐藏
14     [[NSNotificationCenter defaultCenter]addObserver:self 
                                               selector:@selector(keybaordhide:) 
                                                   name:UIKeyboardWillHideNotification object:nil];
15     
16     //设置点击手势，当点击空白处，结束编辑，收回键盘
17     UITapGestureRecognizer *tapp=[[UITapGestureRecognizer alloc]
                                     initWithTarget:self action:@selector(tapAction:)];
18     //开启交互
19     self.view.userInteractionEnabled=YES;
20     //添加手势到视图
21     [self.view addGestureRecognizer:tapp];

 1 //点击手势方法
 2 -(void)tapAction:(UITapGestureRecognizer *)sender
 3 {
 4     [self.view endEditing:YES];
 5 }
 6 
 7 //当键盘出现时，调用此方法
 8 -(void)keyboardwill:(NSNotification *)sender
 9 {
10     //获取键盘高度
11     NSDictionary *dict=[sender userInfo];
12     NSValue *value=[dict objectForKey:UIKeyboardFrameEndUserInfoKey];
13     CGRect keyboardrect = [value CGRectValue];
14     int height=keyboardrect.size.height;
15     
16     //如果输入框的高度低于键盘出现后的高度，视图就上升；
17     if ((_textlab.frame.size.height + _textlab.frame.origin.y)>(self.view.frame.size.height - height))
18     {
19         self.view.frame = CGRectMake(0, -height, self.view.frame.size.width, self.view.frame.size.height);
20     }
21 }
22 
23 //当键盘隐藏时候，视图回到原定
24 -(void)keybaordhide:(NSNotification *)sender
25 {
26      self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
27 }
28 
29 //输入框的get方法
30 -(UITextField *)textlab
31 {
32     if (_textlab==nil)
33     {
34         _textlab=[UITextField new];
35     }
36     return _textlab;
37 }

 1 //开始编辑输入框的时候，软键盘出现，执行此事件
 2 -(void)textFieldDidBeginEditing:(UITextField *)textlab
 3 {
 4     //获取当前输入框的位置信息
 5     CGRect frame = textlab.frame;
 6     //获取键盘底部位置与键盘最高点之间的距离，键盘高度256
 7     int offset = frame.origin.y + frame.size.height - (self.view.frame.size.height - 256.0);
 8     //设置视图上升的时间
 9     NSTimeInterval animaTime = 0.30f;
10     //字符串随意也行...
11     [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
12     //添加视图上的上升时间0.3f
13     [UIView setAnimationDuration:animaTime];
14     
15     //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
16     if(offset > 0)
17         self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
18     //提交动画
19     [UIView commitAnimations];
20 }

//当用户按下return键或者按回车键，keyboard消失
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    //收回键盘第一响应者意思...
    [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);
}