Question

我正在尝试将文本粘贴到光标当前所在的位置。我一直试图做它所说的： - http://dev.ragfield.com/2009/09/insert-text-at-current-cursor-location.html

主要的交易是我不能只去textbox1.text（etc），因为textfield位于自定义单元格的中间。我想在光标所在的位置添加一些文本（当我按下键盘上的自定义键时）。

- 我只想在文本框中粘贴一个小数...

我得到的错误是：

2010-05-15 22：37：20.797 PageControl [37962：207] * - [MyDetailController paste：]：无法识别的选择器发送到实例0x1973d10 2010-05-15 22：37：20.797 PageControl [37962：207] * 由于未捕获的异常'NSInvalidArgumentException'终止应用程序，原因：'*** - [MyDetailController paste：]：无法识别的选择器发送到实例0x1973d10 “

注意：我可以访问textfield标记（如果有帮助吗？）

我在Objective-c中已经过了一个初级阶段，但仍然不是很好。我的代码目前位于以下，https://gist.github.com/d634329e5ddf52945989

谢谢大家。

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

UIViewController 是一个UIResponder ...但是UIResopnder不应该接收insertText：消息。您想在UITextField本身上调用insertText :.如果您查看UIResponder.h，您会在粘贴：方法

附近看到以下注释

//这些方法未在NSObject中实现

意味着在任何UIResponder上调用它们并不一定安全。它们只能安全地在子类上调用，例如实际实现它们的UITextField和UITextView。对于Apple来说，这是一个非常奇怪的设计决定。

iphone sdk - 将问题粘贴到当前文本位置

1 个答案: