#### : macOS系统的顶部导航栏item

@interface AppDelegate (){    NSStatusItem * statusItem;}复制代码

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {    // Insert code here to initialize your application    /* 初始化 */    statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength];    /* 设置NSImage * /    [statusItem.button setImage:[NSImage imageNamed:@"statusItem"]];    /* 设置点击响应事件 */    statusItem.action = @selector(touchStatusItem:);}复制代码

#### : pop视图

@interface AppDelegate (){    NSPopover * popover;}复制代码

-(void)touchStatusItem:(NSStatusBarButton *)button{    /* 初始化 */    popover = [[NSPopover alloc]init];    /* 设置动画 */    popover.behavior = NSPopoverBehaviorTransient;    /* 设置外观 */    popover.appearance = [NSAppearance appearanceNamed:NSAppearanceNameVibrantLight];    /* 设置展示视图 */    popover.contentViewController = [[PopViewController alloc]initWithNibName:@"PopViewController" bundle:nil];    /* 设置展示方位 */    [popover showRelativeToRect:button.bounds ofView:button preferredEdge:NSRectEdgeMaxY];}复制代码

####效果图