iOS 監聽鍵盤高度，輸入框上升

 1 //設置輸入框 ---《由於輸入框用了get方法，因此第一次調用輸入框要用self 調用》；

 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     //添加輸入框到視圖
 8  [self.view addSubview:self.textlab];  9     
10     //監聽鍵盤，鍵盤出現
11     [[NSNotificationCenter defaultCenter]addObserver:self 
                                               selector:@selector(keyboardwill:) 
                                                   name:UIKeyboardWillShowNotification object:nil]; 12 
13     //監聽鍵盤隱藏
14     [[NSNotificationCenter defaultCenter]addObserver:self 
                                               selector:@selector(keybaordhide:) 
                                                   name:UIKeyboardWillHideNotification object:nil]; 15     
16     //設置點擊手勢，當點擊空白處，結束編輯，收回鍵盤
17     UITapGestureRecognizer *tapp=[[UITapGestureRecognizer alloc]
 initWithTarget:self action:@selector(tapAction:)]; 18     //開啓交互
19     self.view.userInteractionEnabled=YES; 20     //添加手勢到視圖
21     [self.view addGestureRecognizer:tapp];

 二、裏面方法的實現

 1 //點擊手勢方法
 2 -(void)tapAction:(UITapGestureRecognizer *)sender
 3 {
 4     [self.view endEditing:YES];
 5 }
 6 
 7 //當鍵盤出現時，調用此方法
 8 -(void)keyboardwill:(NSNotification *)sender
 9 {
10     //獲取鍵盤高度
11     NSDictionary *dict=[sender userInfo];
12     NSValue *value=[dict objectForKey:UIKeyboardFrameEndUserInfoKey];
13     CGRect keyboardrect = [value CGRectValue];
14     int height=keyboardrect.size.height;
15     
16     //若是輸入框的高度低於鍵盤出現後的高度，視圖就上升；
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 //當鍵盤隱藏時候，視圖回到原定
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 //輸入框的get方法
30 -(UITextField *)textlab
31 {
32     if (_textlab==nil)
33     {
34         _textlab=[UITextField new];
35     }
36     return _textlab;
37 }

 防止鍵盤遮擋方式二;

調用UITextField 輸入框的代理方法 <UITextFieldDelegate>

 1 //開始編輯輸入框的時候，軟鍵盤出現，執行此事件
 2 -(void)textFieldDidBeginEditing:(UITextField *)textlab
 3 {
 4     //獲取當前輸入框的位置信息
 5     CGRect frame = textlab.frame;
 6     //獲取鍵盤底部位置與鍵盤最高點之間的距離，鍵盤高度256
 7     int offset = frame.origin.y + frame.size.height - (self.view.frame.size.height - 256.0);
 8     //設置視圖上升的時間
 9     NSTimeInterval animaTime = 0.30f;
10     //字符串隨意也行...
11     [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
12     //添加視圖上的上升時間0.3f
13     [UIView setAnimationDuration:animaTime];
14     
15     //將視圖的Y座標向上移動offset個單位，以使下面騰出地方用於軟鍵盤的顯示
16     if(offset > 0)
17         self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
18     //提交動畫
19     [UIView commitAnimations];
20 }

//當用戶按下return鍵或者按回車鍵，keyboard消失
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    //收回鍵盤第一響應者意思...
    [textField resignFirstResponder];
    return YES;
}

//輸入框編輯完成之後，將視圖恢復到原始狀態
-(void)textFieldDidEndEditing:(UITextField *)textField
{
    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}