可可：關閉菜單前的閃爍項目

Question

在OSX上單擊菜單項目時，該項目在菜單關閉前閃爍（開 - 關 - 關）。

我問我自己怎麼能模仿那種行爲？ （我已經重新實現使用NSCollectionView，選擇&集團公司在項目，不論工作菜單）

我試過2認爲，沒有工作：

mouseOver = false; 
[self drawRect:self.bounds]; 
mouseOver = true; 
[self drawRect:self.bounds]; 

[[self window] performSelector:@selector(orderOut:) withObject:nil afterDelay:0.1]; 

和

mouseOver = false; 
[self setNeedsDisplayInRect:self.bounds]; 
[self needsDisplay]; 
mouseOver = true; 
[self setNeedsDisplayInRect:self.bounds]; 
[self needsDisplay]; 

[[self window] performSelector:@selector(orderOut:) withObject:nil afterDelay:0.1]; 

Answer 1

我去爲解決方案：

-(void)mouseDown:(NSEvent *)theEvent { 
    [super mouseDown:theEvent]; 

    [self performSelector:@selector(blinkItemOnce:) withObject:[NSNumber numberWithBool:NO] afterDelay:0.0]; 
    [self performSelector:@selector(blinkItemOnce:) withObject:[NSNumber numberWithBool:YES] afterDelay:0.05]; 
    [[self window] performSelector:@selector(orderOut:) withObject:nil afterDelay:0.15]; 
} 

-(void) blinkItemOnce:(NSNumber*) b { 
    mouseOver = [b boolValue]; 
    [self setNeedsDisplayInRect:self.bounds]; 
    [self setNeedsDisplay:YES]; 
}