如何将参数传递给选择器？ [英] How can I pass a parameter to a selector?

问题描述

我有一个NSSearchField：

I have an NSSearchField:

[searchField setAction:@selector(doSearchWithQuery:)];

这里是我的doSearchQuery：

Here is my doSearchQuery:

-(void)doSearchWithQuery:(NSString*)query{

我可以将我的searchfield的内容传递给doSearchWithQuery？

How can I pass the contents of my searchfield into doSearchWithQuery?

推荐答案

选择器不会执行任何操作或接受任何参数 - 它只是要发送的消息的名称。您只能在实际发送消息时传递参数。但是，控件总是将自身作为参数传递给他们的操作，所以你需要的是一个包装器方法，遵循这些行：

You can't do exactly what you're describing. A selector doesn't do anything or accept any parameters — it's just the name of the message to send. You can only pass arguments when you actually send a message. However, controls always pass themselves as an argument to their actions, so what you need is a wrapper method along these lines:

- (void)doSearchFromSearchField:(NSSearchField *)sender {
    [self doSearchWithQuery:[sender stringValue]];
}

并设置为操作。

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