关于objective c：键盘隐藏了IOS中的文本字段


keyboard is hiding the text field in IOS

本问题已经有最佳答案，请猛点这里访问。

我在iOS中使用滚动视图创建了一个带有一些文本字段的表单。这里的景色是这样的，

view of form

当我开始编辑状态或下面的字段时，键盘会隐藏该字段。这样地，

enter image description here

我应该怎么做才能看到下面的字段(即状态和下面的字段)？？

相关讨论

你可以试试这个代码

在viewcontroller.m文件的顶部添加以下代码

1
2
3
4
5
6
static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;
CGFloat animatedDistance;

应在文本字段内注册

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 -(BOOL) textFieldShouldBeginEditing:(UITextField*)textField
 {    
     CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];
    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    CGFloat numerator =  midline - viewRect.origin.y  - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
    * viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;
    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }  
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }
    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
   if (orientation == UIInterfaceOrientationPortrait ||
    orientation == UIInterfaceOrientationPortraitUpsideDown)
   {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
   }
   else
   {
       animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
   }
   CGRect viewFrame = self.view.frame;
   viewFrame.origin.y -= animatedDistance;

   [UIView beginAnimations:nil context:NULL];
   [UIView setAnimationBeginsFromCurrentState:YES];
   [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
   [self.view setFrame:viewFrame];
   [UIView commitAnimations];
   return YES;

}

内部文本字段应专用

1
2
3
4
5
6
7
8
9
10
- (BOOL) textFieldShouldEndEditing:(UITextField*)textField
{
     CGRect viewFrame = self.view.frame;
     viewFrame.origin.y += animatedDistance;    
     [UIView beginAnimations:nil context:NULL];
     [UIView setAnimationBeginsFromCurrentState:YES];
     [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];    
     [self.view setFrame:viewFrame];
     [UIView commitAnimations];
}
相关讨论

在发布问题之前，您一定要在堆栈溢出本身中搜索这个。无论如何，你可以在这里找到答案。

  • 符合UITextFieldDelegate号协议

  • 有一个bool变量moved来发出信号，无论您的视图是否被移动。

  • 然后实现委托方法。

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    -(void)textFieldDidBeginEditing:(UITextField *)textField {
        if(!moved) {
         [self animateViewToPosition:self.view directionUP:YES];
        moved = YES;
      }
    }

    -(void)textFieldDidEndEditing:(UITextField *)textField {
     [textField resignFirstResponder];
    }

    -(BOOL)textFieldShouldReturn:(UITextField *)textField {
     [textField resignFirstResponder];
      if(moved) {
         [self animateViewToPosition:self.view directionUP:NO];
      }
     moved = NO;
     return YES;
    }


    -(void)animateViewToPosition:(UIView *)viewToMove directionUP:(BOOL)up {

       const int movementDistance = -60; // tweak as needed
       const float movementDuration = 0.3f; // tweak as needed

       int movement = (up ? movementDistance : -movementDistance);
       [UIView beginAnimations: @"animateTextField" context: nil];
       [UIView setAnimationBeginsFromCurrentState: YES];
       [UIView setAnimationDuration: movementDuration];
       viewToMove.frame = CGRectOffset(viewToMove.frame, 0, movement);
       [UIView commitAnimations];
    }
    • 相关讨论

    你需要在你的应用程序中使用tpavoidingkeyboard库，你的问题就解决了。

    https://github.com/michaeltyson/tpkeyboardavailing

    请参见此链接。下载此项目并将其添加到您的项目中。

    然后，首先必须将ScrollView添加到视图中，然后将所有文本字段添加到该ScrollView中，将该TpavoidingScrollView添加到自定义类中。

    Add Your TPAVoidingScrollviewClass here

    你的代码很好。但是你必须改变uiscrollview的y位置而不是高度。我已经更改了你的代码并更新了。请更新这个

    步骤1:在类的VIEWDIDLOAD方法中，设置为侦听有关键盘的消息：

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    // Listen for keyboard appearances and disappearances
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardDidHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];

    步骤2：通过在同一个类中实现选择器方法来向上/向下滚动视图

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    - (void)keyboardDidShow: (NSNotification *) notif{
        //Keyboard becomes visible
        scrollView.frame = CGRectMake(scrollView.frame.origin.x,
                                      scrollView.frame.origin.y - 220,
                                      scrollView.frame.size.width,
                                      scrollView.frame.size.height);   //move up
    }

    - (void)keyboardDidHide: (NSNotification *) notif{
        //keyboard will hide
        scrollView.frame = CGRectMake(scrollView.frame.origin.x,
                                      scrollView.frame.origin.y + 220,
                                      scrollView.frame.size.width,
                                      scrollView.frame.size.height);   //move down
    }
    相关讨论

    您可以看到此链接：

    1)使用滚动视图

    https://github.com/robbdimitrov/rdvkeyboardavointing/避开

    这对你很有用。

    2)带TableView

    https://github.com/breeno/editinguitableview网站

    试试这个代码

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
     - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
     {
         if(textField==tfLocation)
         {
             [self.view setFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y-50, self.view.frame.size.width, self.view.frame.size.height)];
         }
         return YES;
     }

     - (void)textFieldDidEndEditing:(UITextField *)textField
    {
        [self.view setFrame:CGRectMake(self.view.frame.origin.x, 0, self.view.frame.size.width, self.view.frame.size.height)];
    }