禁用键盘上的按键

Question

我是Objective-C的新手,我希望限制用户从普通键盘的字母部分切换到数字/标点符号.这就是说,我想禁用键盘上的按钮进行切换.也许我正在使用错误的搜索参数,但我在谷歌上找不到什么,在我的参考书中更少.我如何实际禁用iOS键盘上的按钮？使用字母/数字/标点字符,只需忽略输入的输入字符即可轻松完成,但在键盘部分之间切换的按钮执行操作而不是返回字符.

谢谢您的帮助!

Answer 1

您实际上可以添加和删除默认按钮UIKeyboard

互联网上有一些食谱，如下所示：http://www.iphonedevsdk.com/forum/iphone-sdk-development/6573-howto-customize-uikeyboard.html和这样的：http://www.iphonedevsdk.com/论坛/iphone-sdk-development/6275-add-toolbar-top-keyboard.html

这些帖子向您展示了如何添加按钮，但是可以使用相同的原理来删除按钮。

下面我将向您展示其中一种解决方案的汇编：

//The UIWindow that contains the keyboard view - 
//It some situations it will be better to actually
//iterate through each window to figure out where the keyboard is, 
// but In my applications case
//I know that the second window has the keyboard so I just reference it directly
//
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] 
//                     objectAtIndex:1];

//Because we cant get access to the UIKeyboard throught the SDK we will 
// just use UIView. 
//UIKeyboard is a subclass of UIView anyways
UIView* keyboard;

//Iterate though each view inside of the selected Window
for(int i = 0; i < [tempWindow.subviews count]; i++)
{
    //Get a reference of the current view 
    keyboard = [tempWindow.subviews objectAtIndex:i];

    //Check to see if the className of the view we have 
    //referenced is "UIKeyboard" if so then we found
    //the keyboard view that we were looking for
    if([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES)
    {
        // Keyboard is now a UIView reference to the 
        // UIKeyboard we want. From here we can add a subview
        // to th keyboard like a new button

        //Do what ever you want to do to your keyboard here...
    }
}