在键向上而不是返回时,从NSTextField发送操作 [英] Send action from NSTextField when on key up instead of return
问题描述
我想显示一个键已被解除后剩下的一个新推文的字符数。目前,只有当返回被解除时才会发生:
- (IBAction)updateCharacterCountFromNewTweetField:(id)sender {
[ newTweetCharacterCount setIntValue:140 - [[sender stringValue] length]];
}
此操作连接到 NSTextField A UITextField!):
这对用户来说是可怕的,因为他们想立即看到字符数,而不只是按回车后。
任何人都可以帮助我吗?感谢。
在文本字段上设置一个委托,并实现 controlTextDidChange:委托方法。 / p>
另请参阅文本编辑编程指南:代表消息和通知。
I want to show the number of characters left for a new tweet, after a key has been lifted. Currently, this only happens if return is lifted:
- (IBAction)updateCharacterCountFromNewTweetField:(id)sender {
[newTweetCharacterCount setIntValue:140 - [[sender stringValue] length]];
}
This action is connected to an NSTextField (NOT A UITextField!!):
This is terrible for users, because they want to see the character count immediately, not just after pressing return.
Can anyone help me out? Thanks.
Set a delegate on the textfield and have it implement the controlTextDidChange: delegate method.
See also Text Editing Programming Guide: Delegate Messages and Notifications.
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