爲iPad應用程序定製的數字鍵盤

Question

我正在爲運行在iOS 8（不適用於應用商店）的iPad創建內部應用程序，其中一項要求是複製iPad解鎖/ PIN碼條目數字鍵盤的定製鍵盤。

我根據我的自定義數字鍵盤在這個項目上：https://github.com/lnafziger/Numberpad

在項目中，我添加了一個新的UIView到的UIViewController，這樣我可以複製出現在一個4位數的PIN碼的類型爲點如下：

我的問題是，當我點擊他們，我不能得到正確的數字的目標。我的目標是，當我點擊數字0到9時，第一個水龍頭會將該數字放入第一個文本框，第二個放入第二個數字中等等。但是，我無法在數字鍵盤上點擊任何4可用的UITextFields。

[編輯]

這是迄今爲止那部分代碼：

#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; 
    } 

在原有項目的數字鍵盤針對性一個的UITextField，並把所有的抽頭數到那裏。現在我想讓它在我的4個UITextFields之間自動移動（一個UITextField只能接受1個字符，然後移動到下一個UITextField）。 numberpadNumberPressed方法似乎根本不會觸發更新文本字段。

[END編輯]

我該怎麼做？

Answer 1

這可能很簡單。

只需保留已被點擊的數字一個可變字符串變量。按下某個鍵時，請添加下一個數字。如果刪除鍵被按下，刪除最後一個號碼（如果有的話）。這應該很容易。例如。

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

和

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

你是不是在編輯文本字段中的數字，所以你應該使用的標籤。在下面，我假設你給他們的標籤101,102,103和104。

然後就做這樣的事情：

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