Objective c 删除NSView的多个实例

我有这段代码，它绘制了一个窗口和NSView，并设置了鼠标进入和退出时的跟踪，以增加/减少窗口的大小。问题是，当调用鼠标事件并且宽度和高度的int值增加时，窗口会将自身重新绘制到新的高度，并将旧窗口保留在那里，如何删除旧窗口并只绘制新窗口？谢谢

- (void)toggleHelpDisplay:(int)value
    {
            // Create helpWindow.
            NSRect mainFrame = [[NSScreen mainScreen] frame];
            NSRect helpFrame = NSZeroRect;
            float width = 90;
            float height = 90;
            helpFrame.origin.x = (mainFrame.size.width - width) / 2.0;
            helpFrame.origin.y = 200.0;
            helpFrame.size.width = width + value;
            helpFrame.size.height = height + value;

            helpWindow = [[BrightnessView windowWithFrame:helpFrame] retain];

            // Configure window.
            [helpWindow setReleasedWhenClosed:YES];
            [helpWindow setHidesOnDeactivate:NO];
            [helpWindow setCanHide:NO];
            [helpWindow setCollectionBehavior:NSWindowCollectionBehaviorCanJoinAllSpaces];
            [helpWindow setIgnoresMouseEvents:NO];

            // Configure contentView.
            NSView *contentView = [helpWindow contentView];
            [contentView setWantsLayer:YES];
            CATextLayer *layer = [CATextLayer layer];
            layer.opacity = 0;
            [contentView setLayer:layer];
            CGColorRef bgColor = CGColorCreateGenericGray(0.0, 0.6);
            layer.backgroundColor = bgColor;
            CGColorRelease(bgColor);
            layer.string = (shadyEnabled) ? HELP_TEXT : HELP_TEXT_OFF;
            layer.contentsRect = CGRectMake(0, 0, 1, 1);
            layer.fontSize = 40.0;
            layer.foregroundColor = CGColorGetConstantColor(kCGColorWhite);
            layer.borderColor = CGColorGetConstantColor(kCGColorWhite);
            layer.borderWidth = 4.0;
            layer.cornerRadius = 4.0;
            layer.alignmentMode = kCAAlignmentCenter;

            [window addChildWindow:helpWindow ordered:NSWindowAbove];

            float helpOpacity = (([NSApp isActive] ? 1 : 0));
            [[[helpWindow contentView] layer] setOpacity:helpOpacity];

            //track mouse so that once hovered make larger.

        self.helpView = contentView;
        trackingArea = [[[NSTrackingArea alloc] initWithRect:[self.helpView bounds]
                                                                     options:NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways
                                                                       owner:self
                                                                    userInfo:nil] autorelease];
        [self.helpView addTrackingArea:trackingArea];

    }

    - (void)mouseEntered:(NSEvent *)event;
    {
        NSLog(@"entered");
        [self toggleHelpDisplay:+100];

    }

    - (void)mouseExited:(NSEvent *)event;
    {
        NSLog(@"exited");
        [self toggleHelpDisplay:-100];
    }

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每次鼠标进入或退出时，您似乎都在重新创建“帮助”窗口，而您所要做的只是更改其框架。为什么不使用创建窗口一次所需的代码，并在mouseDown方法中使用setFrame:display更改框架：

[helpWindow setFrame:NSMakeRect(helpWindow.frame.origin.x,helpWindow.frame.origin.y,helpWindow.size.width +100,helpWindow.size.height +100) display:YES];

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你能澄清一下你所说的改变框架是什么意思吗？谢谢当鼠标进出时，你不是在改变窗口的大小吗？如果是这样，您只需要获得窗口的框架，然后从frame.size.width和frame.size.heights中加上或减去100。是的，但是我如何做到这一点，而不使用int-value方法，然后像我那样只添加值number？我明白你的意思，我正在重新创建窗口，但我不知道如何增加宽度和高度。我必须创建一个新的跟踪区域吗？当前跟踪区域仅适用于rect的旧大小，而不是resizedI不这么认为的，因为helpView是窗口的内容视图，我认为它会自动调整大小以填充窗口。