限制UITextView或UITextField中的粘贴字符串长度 [英] Limiting pasted string length in UITextView or UITextField
问题描述
限制直接输入UITextView或UITextField的字符串的问题已在SO上解决：
The problem of limiting strings that are directly entered into a UITextView or UITextField has been addressed on SO before:
- iPhone SDK: Set Max Character length TextField
- iPhone sdk 3.0 issue
然而现在使用OS 3.0复制粘贴成为一个问题，因为上述SO问题中的解决方案不会阻止粘贴其他字符（即，您不能输入超过10个字符使用上述解决方案配置的字段，但您可以轻松地将100个字符粘贴到同一字段中。）
However now with OS 3.0 copy-and-paste becomes an issue, as the solutions in the above SO questions don’t prevent pasting additional characters (i.e. you cannot type more than 10 characters into a field that is configured with the above solutions but you can easily paste 100 characters into the same field).
是否有一种方法可以防止直接输入字符串和粘贴字符串溢出？
Is there a means of preventing directly entered string and pasted string overflow?
推荐答案
我能够通过符合te来限制输入和粘贴的文本xtViewDidChange：UITextViewDelegate协议中的方法。
I was able to restrict entered and pasted text by conforming to the textViewDidChange: method within the UITextViewDelegate protocol.
- (void)textViewDidChange:(UITextView *)textView
{
if (textView.text.length >= 10)
{
textView.text = [textView.text substringToIndex:10];
}
}
但我仍然认为这是一种丑陋的黑客，似乎Apple应该提供UITextFields和UITextViews的某种maxLength属性。
But I still consider this kind of an ugly hack, and it seems Apple should have provided some kind of "maxLength" property of UITextFields and UITextViews.
如果有人知道更好的解决方案，请告诉你。
If anyone is aware of a better solution, please do tell.
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