为iPad应用程序定制的数字键盘

Question

我正在为运行在iOS 8（不适用于应用商店）的iPad创建内部应用程序，其中一项要求是复制iPad解锁/ PIN码条目数字键盘的定制键盘。

我根据我的自定义数字键盘在这个项目上：https://github.com/lnafziger/Numberpad

在项目中，我添加了一个新的UIView到的UIViewController，这样我可以复制出现在一个4位数的PIN码的类型为点如下：

我的问题是，当我点击他们，我不能得到正确的数字的目标。我的目标是，当我点击数字0到9时，第一个水龙头会将该数字放入第一个文本框，第二个放入第二个数字中等等。但是，我无法在数字键盘上点击任何4可用的UITextFields。

[编辑]

这是迄今为止那部分代码：

#pragma mark - KEYPAD IBACTIONS 

// A number (0-9) was just pressed on the number pad 
// Note that this would work just as well with letters or any other character and is not limited to numbers. 
- (IBAction)numberpadNumberPressed:(UIButton *)sender { 
    if (self.targetTextInput) { 
     NSString *numberPressed = sender.titleLabel.text; 
     if ([numberPressed length] > 0) { 
      UITextRange *selectedTextRange = self.targetTextInput.selectedTextRange; 
      if (selectedTextRange) { 
       [self textInput:self.targetTextInput replaceTextAtTextRange:selectedTextRange withString:numberPressed]; 
      } 
     } 
    } 
} 

// The delete button was just pressed on the number pad 
- (IBAction)numberpadDeletePressed:(UIButton *)sender { 
    if (self.targetTextInput) { 
     UITextRange *selectedTextRange = self.targetTextInput.selectedTextRange; 
     if (selectedTextRange) { 
      // Calculate the selected text to delete 
      UITextPosition *startPosition = [self.targetTextInput positionFromPosition:selectedTextRange.start offset:-1]; 
      if (!startPosition) { 
       return; 
      } 
      UITextPosition *endPosition = selectedTextRange.end; 
      if (!endPosition) { 
       return; 
      } 
      UITextRange  *rangeToDelete = [self.targetTextInput textRangeFromPosition:startPosition 
                       toPosition:endPosition]; 

      [self textInput:self.targetTextInput replaceTextAtTextRange:rangeToDelete withString:@""]; 
     } 
    } 
} 

// The clear button was just pressed on the number pad 
- (IBAction)numberpadClearPressed:(UIButton *)sender { 
    if (self.targetTextInput) { 
     UITextRange *allTextRange = [self.targetTextInput textRangeFromPosition:self.targetTextInput.beginningOfDocument 
                    toPosition:self.targetTextInput.endOfDocument]; 

     [self textInput:self.targetTextInput replaceTextAtTextRange:allTextRange withString:@""]; 
    } 
} 

// The done button was just pressed on the number pad 
- (IBAction)numberpadDonePressed:(UIButton *)sender { 
    if (self.targetTextInput) { 
     [self.targetTextInput resignFirstResponder]; 
    } 
} 

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField 
{ 
    return YES; 
} 

- (BOOL)textViewShouldEndEditing:(UITextView *)textView 
{ 
    return YES; 
} 

// Replace the text of the textInput in textRange with string if the delegate approves 
- (void)textInput:(id <UITextInput>)textInput replaceTextAtTextRange:(UITextRange *)textRange withString:(NSString *)string { 
    if (textInput) { 
     if (textRange) { 
      // Calculate the NSRange for the textInput text in the UITextRange textRange: 
      int startPos     = [textInput offsetFromPosition:textInput.beginningOfDocument 
                   toPosition:textRange.start]; 
      int length      = [textInput offsetFromPosition:textRange.start 
                   toPosition:textRange.end]; 
      NSRange selectedRange   = NSMakeRange(startPos, length); 

      if ([self textInput:textInput shouldChangeCharactersInRange:selectedRange withString:string]) { 
       // Make the replacement: 
       [textInput replaceRange:textRange withText:string]; 
      } 
     } 
    } 
} 

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { 
    NSString *passcode = [textField text]; 
    passcode = [passcode stringByReplacingCharactersInRange:range withString:string]; 

    switch ([passcode length]) { 
     case 0: 
      self.txtBulletField0.text = nil; 
      self.txtBulletField1.text = nil; 
      self.txtBulletField2.text = nil; 
      self.txtBulletField3.text = nil; 
      break; 
     case 1: 
      self.txtBulletField0.text = @"*"; 
      self.txtBulletField1.text = nil; 
      self.txtBulletField2.text = nil; 
      self.txtBulletField3.text = nil; 
      break; 
     case 2: 
      self.txtBulletField0.text = @"*"; 
      self.txtBulletField1.text = @"*"; 
      self.txtBulletField2.text = nil; 
      self.txtBulletField3.text = nil; 
      break; 
     case 3: 
      self.txtBulletField0.text = @"*"; 
      self.txtBulletField1.text = @"*"; 
      self.txtBulletField2.text = @"*"; 
      self.txtBulletField3.text = nil; 
      break; 
     case 4: 
      self.txtBulletField0.text = @"*"; 
      self.txtBulletField1.text = @"*"; 
      self.txtBulletField2.text = @"*"; 
      self.txtBulletField3.text = @"*"; 

      // Notify delegate a little later so we have a chance to show the 4th bullet 
      [self performSelector:@selector(notifyDelegate:) withObject:passcode afterDelay:0]; 

      return NO; 

      break; 
     default: 
      break; 
    } 

在原有项目的数字键盘针对性一个的UITextField，并把所有的抽头数到那里。现在我想让它在我的4个UITextFields之间自动移动（一个UITextField只能接受1个字符，然后移动到下一个UITextField）。 numberpadNumberPressed方法似乎根本不会触发更新文本字段。

[END编辑]

我该怎么做？

Answer 1

这可能很简单。

只需保留已被点击的数字一个可变字符串变量。按下某个键时，请添加下一个数字。如果删除键被按下，删除最后一个号码（如果有的话）。这应该很容易。例如。

if (pinString.length < 4) { 
    [pinString appendString:sender.titleLabel.text] 
} 

和

if (pinString.length) { 
    [pinString deleteCharactersInRange:NSMakeRange(pinString.length-1,1)]; 
} 

你是不是在编辑文本字段中的数字，所以你应该使用的标签。在下面，我假设你给他们的标签101,102,103和104。

然后就做这样的事情：

for (UILabel *label in theFourTextLabels) { 
    label.text = label.tag - 100 > pinString.length ? "" : "*"; 
}