NSStatusBarItem控制窗口显示

1.首先先创建NSStatusBarItem ,需要将item保存到属性中，否则对象会被系统的管理机制释放掉，NSStatusBar将不会出现item.

NSStatusItem * item = [[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength];

[item.button setTarget:self];

[item.button setAction:@selector(itemClick:)];

item.button.image = [NSImage imageNamed:@"online"];

self.item  = item;

2.itemClick:方法，此时的item点击事件只能将处于非活动状态的应用窗口呼出到最前面，[[NSRunningApplication currentApplication] activateWithOptions:NSApplicationActivateAllWindows | NSApplicationActivateIgnoringOtherApps];

3.增加通知监听window的变化，系统发出通知，创建属性记录windonw的状态，BOOL 类型isMin，发出通知时，改变属性的值，记录状态的变化.

//最小化时，系统发出通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(minWindown:) name:NSWindowDidMiniaturizeNotification object:nil];

//处于最小化时，点击Dock区恢复

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mainWindown:) name:NSWindowDidBecomeMainNotification object:nil];

4.在点击事件中根据属性的值，来控制如何显示windown

- (void)mainWindown:(NSNotification *)noti {

self.isMin = NO;

}

- (void)minWindown:(NSNotification *)noti {

self.isMin = YES;

}

- (IBAction)itemClick:(NSButton *)sender{

if (self.isMin == YES) {

[self.window makeKeyAndOrderFront:self];

[self.window center];

}else {

self.isMin = NO;

[[NSRunningApplication currentApplication] activateWithOptions:NSApplicationActivateAllWindows | NSApplicationActivateIgnoringOtherApps];

}

}