NSTextField：当用户在文本字段之外单击时结束编辑 [英] NSTextField: end editing when user clicks outside of the text field

问题描述

我有一个 NSTextField ，我可以根据用户操作对其进行设置。当用户单击窗口内文本字段之外的任意位置时，我想结束编辑。

I have an NSTextField that I'm setting editable depending on a user action. I'd like to end editing when the user clicks anywhere outside of the text field inside the window.

看似简单，但我无法做到这一点。我实现了 controlTextDidEndEditing 和 textDidEndEditing ，但是没有运气，尤其是当我单击不接受

Seems simple, but I could not get this to work. I implemented controlTextDidEndEditing and textDidEndEditing, but no luck, especially when I click on a user interface element that does not accept the first responder status.

推荐答案

每个NSEvent都通过NSWindow的 sendEvent传递：

Every NSEvent is pass through NSWindow's sendEvent: method.

您可以创建自定义NSWindow并覆盖 sendEvent：方法。如果发生鼠标按下事件，请通过NSNotificationCenter进行广播：

You can create a custom NSWindow and override the sendEvent: method. If there is a mouse down event, broadcast it by the NSNotificationCenter:

- (void)sendEvent:(NSEvent *)event {
    [super sendEvent:event];
    if (event.type == NSLeftMouseDown) {
        [[NSNotificationCenter defaultCenter] postNotificationName:kCustomWindowMouseDown object:self userInfo:@{@"event": event}];
    }
}

在ViewController中，引用NSTextField，观察者此通知：

In the ViewController which reference the NSTextField, observer this notification:

 [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(customWindowMouseDown:)
                                                 name:kCustomWindowMouseDown
                                               object:self.view.window];

如果鼠标向下事件的位置不在文本范围内，则结束编辑字段：

End the editing if the mouse down event's location is outside of the text field:

- (void)customWindowMouseDown:(id)sender {
    NSNotification *notification = (NSNotification *) sender;

    NSEvent *event = notification.userInfo[@"event"];
    NSPoint locationInWindow = event.locationInWindow;

    if ([self.view.window.firstResponder isKindOfClass:NSTextView.class]) {
        NSTextView *firstResponder = (NSTextView *) self.view.window.firstResponder;

        //we only care about the text field referenced by current ViewController
        if (firstResponder.delegate == (id <NSTextViewDelegate>) self.textField) {

            NSRect rect = [self.textField convertRect:self.textField.bounds toView:nil];

            //end editing if click out side
            if (!NSPointInRect(locationInWindow, rect)) {
                [self.view.window makeFirstResponder:nil];
            }

        }
    }
}

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