iphone sdk - 粘貼到當前文本位置的問題

Question

我試圖將文本粘貼到光標當前所在的位置。我一直在努力做到： - http://dev.ragfield.com/2009/09/insert-text-at-current-cursor-location.html

最主要的是，我不能只是去textbox1.text（等），因爲文本字段是在自定義單元格的中間。我只想將一些文本添加到光標所在的位置（當我按下鍵盤上的自定義鍵時）。

-I只想小數粘貼到文本框...

我得到的錯誤是：

2010-05-15 22：37：20.797的PageControl [37962：207] * - [MyDetailController paste：]：無法識別的選擇器發送到實例0x1973d10 2010-05-15 22：37：20.797 PageControl [37962：207] *由於未捕獲異常'NSInvalidArgumentException'而終止應用程序，原因：'*** - [MyDetailController粘貼：]：無法識別的選擇器發送到實例0x1973d10'

注：我有機會獲得文本字段標籤（有沒有什麼幫助？）

我有點過去在Objective-C初學者階段，但仍然不是很大。我的代碼目前在下面，並在https://gist.github.com/d634329e5ddf52945989

謝謝大家。

---

MyDetailController.h

@interface MyDetailController : UITableViewController <UITextFieldDelegate,UINavigationControllerDelegate> 
{ 

//...(lots in here) 

} 


@end 


@interface UIResponder(UIResponderInsertTextAdditions) 
- (void) insertText: (NSString*) text; 
@end 

---

MyDetailController.m

@implementation MyDetailController 


//.... (lots in here) 



- (void)addDecimal:(NSNotification *)notification { 
    // Apend the Decimal to the TextField. 
    //savedAmount.text = [savedAmount.text stringByAppendingString:@"."]; 

    NSLog(@"Decimal Pressed"); 
    NSLog(@"tagClicked: %d",tagClicked); 
    switch (tagClicked) { 
     case 7: 

      //savedAmount.text = [savedAmount.text stringByAppendingString:@"."]; 
      break; 
     case 8: 
      //goalAmount.text = [goalAmount.text stringByAppendingString:@"."]; 
      break; 
     case 9: 
      //incrementAmount.text = [incrementAmount.text stringByAppendingString:@"."]; 
      break;  
     case 10: 
      //incrementAmount.text = [incrementAmount.text stringByAppendingString:@"."]; 
     break; 
    } 

    [self insertText:@"."]; 
} 

-(void)textFieldDidBeginEditing:(UITextField *)textfield{ 

    //UITextField *theCell = (UITextField *)sender; 
    tagClicked = textfield.tag; 
    NSLog(@"textfield changed. tagClicked: %d",tagClicked); 



} 

@end 

    @implementation UIResponder(UIResponderInsertTextAdditions) 

    - (void) insertText: (NSString*) text 
    { 
     // Get a refererence to the system pasteboard because that's 
     // the only one @selector(paste:) will use. 
     UIPasteboard* generalPasteboard = [UIPasteboard generalPasteboard]; 

     // Save a copy of the system pasteboard's items 
     // so we can restore them later. 
     NSArray* items = [generalPasteboard.items copy]; 

     // Set the contents of the system pasteboard 
     // to the text we wish to insert. 
     generalPasteboard.string = text; 

     // Tell this responder to paste the contents of the 
     // system pasteboard at the current cursor location. 
     [self paste: self]; 

     // Restore the system pasteboard to its original items. 
     generalPasteboard.items = items; 

     // Free the items array we copied earlier. 
     [items release]; 
    } 

    @end 

Answer 1

的UIViewController 是一個UIResponder ......但它不是應該收到insertText：消息的UIResopnder。你想在UITextField本身上調用insertText：如果您在UIResponder.h看看你會看到貼近以下注釋：方法

//沒有在NSObject的

含義，它並不一定安全，他們只是任何呼籲實施這些方法UIResponder。它們只能在UITextField和UITextView等子類中被安全地調用，並且實際上可以實現它們。這對蘋果來說是一個非常奇怪的設計決定。