将格式化程序附加到 iPhone 上的 UITextField
我正在尝试在用户输入文本时格式化 UITextField，例如显示数千个分隔符。
我找到了这个网页： http:// www.iphonedevsdk.com/forum/iphone-sdk-development/16512-trying-add-commas.html
看来shouldChangeCharactersInRange:不是一个好的解决方案。我想到了一个自定义 UIView，其中视图将随着用户输入数字而更新，但它需要重新创建轮子......
I'm trying to format an UITextField as user types text, for instance to show separator for thousands.
I found this web page : http://www.iphonedevsdk.com/forum/iphone-sdk-development/16512-trying-add-commas.html
It seems that shouldChangeCharactersInRange: is not a good solution. I thought of a custom UIView where the view would be updated as the user types digits, yet it would require recreating the wheel...
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我相信 UITextView 有一个回调，每次其内容发生更改时都会触发，然后您可以通过格式化程序运行整个内容。
编辑：对，找到文档 这里 UITextViewTextDidChangeNotification
应该很容易实现，但是，请注意，当用户输入合理数量的文本时，每次击键都会调用您的代码段，我建议在之前检查的文本和新文本之间进行某种差异，否则您将在每次击键时检查一大块文本（例如，您可以添加时间延迟吗？）
I believe UITextView has a callback that fires everytime there is a change to its contents, then you can run the whole contents through a formatter.
EDIT: Right, found the Docs Here The UITextViewTextDidChangeNotification
Should be easy enough to implement, however, a heads up, when the user types in a reasonable amount of text every keystroke will call your piece of code, i suggest making some sort of a diff between text previously checked and new text, otherwise you'll be checking a huge block of text on every keystroke (You could add a time delay for example?)