iPhone 负数键盘布局？
我的用户需要输入纬度和经度，当然我需要验证输入的值是否是合法的纬度/经度值。 我想要一个键盘布局，可以为我完成一些工作（消除字母字符、标点符号等，只留下数字和+/-）。 数字键盘似乎无法做到这一点（缺少 +/-），SDK 附带的任何其他键盘布局也无法做到这一点。 有谁知道是否有一种方法可以提供这种功能，而无需使用我自己的键盘输入法和越狱手机？
谢谢！
My users need to enter latitude and longitude, and of course I need to verify that the values entered are legitimate lat/long value. I'd like to have a keyboard layout that does some of this for me (eliminating alphabetic characters, punctuation, etc, and leaving only the numbers and +/-). The number pad keyboard doesn't seem to do it (missing +/-) and neither do any other keyboard layouts that come with the SDK. Does anyone know if there is a way to provide that capability without doing my own keyboard IME and jailbreaking the phone?
Thanks!
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在 UITextView 旁边放置一个“+/-”按钮来切换输入文本的符号怎么样？ 或者出现在其左侧的“+”按钮，每次点击它时，按钮标签都会从“+”切换到“-”。
How about placing a "+/-" button next to your UITextView that would switch the sign of the entered text? Or a "+" button that appears to the left of it that switches the button label from "+" to "-" each time you tap it.
你不必越狱。
如果您创建一个视图来模拟键盘，您仍然需要遵守 SDK 规则。
You don't have to jailbreak.
If you create a view to simulate the keyboard you're still following the SDK rules.
我知道这个答案已经太晚了，但这个话题仍然与我相关。 因此，我希望以下内容能够帮助浏览此页面的人。
Bryan S. Gruver 发布了一个完整的 Xcode 项目，lambdabunny 可以稍微修改该项目以实现他们的目标。 你可以在这里找到它：
http://brygruver.squarespace。 com/blog/2009/10/1/creating-a-custom-number-pad.html
更新
Squarespace 链接现已断开。 另一种选择是：
https://github.com/lnafziger/Numberpad
I know this is answer is way late, but this topic was still relevant to me. Therefore I have hope the following will help someone who comes across this page.
Bryan S. Gruver posted a full Xcode project that lambdabunny could modify ever so slightly in order to achieve their aim. You can find it here:
http://brygruver.squarespace.com/blog/2009/10/1/creating-a-custom-number-pad.html
Update
The Squarespace link is now broken. Another option is:
https://github.com/lnafziger/Numberpad