swift导航栏导航按钮添加多个按钮事件

//导航左边返回按钮

let button1 = UIButton(frame:CGRectMake(0, 0, 18, 18))

button1.setImage(Constant.Image.NavigationBackImage, forState: .Normal)

button1.addTarget(self,action:#selector(leftItemAction),forControlEvents:.TouchUpInside)

let barButton1 = UIBarButtonItem(customView: button1)

let button2 = UIButton(frame:CGRectMake(40, 0, 18, 18))

button2.setImage(Constant.Image.CalendarImage, forState: .Normal)

button2.addTarget(self,action:#selector(self.historyDectoryClick),forControlEvents:.TouchUpInside)

let barButton2 = UIBarButtonItem(customView: button2)

//按钮间的空隙

let gap = UIBarButtonItem(barButtonSystemItem: .FixedSpace, target: nil,

action: nil)

gap.width = 20;

//用于消除左边边空隙，要不然按钮顶不到最边上

let spacer = UIBarButtonItem(barButtonSystemItem: .FixedSpace, target: nil,

action: nil)

spacer.width = 1;

//设置按钮（注意顺序）

self.navigationItem.leftBarButtonItems = [spacer,barButton1,gap,barButton2]

//右边

navigationItem.rightBarButtonItem = UIBarButtonItem.init(image: Constant.Image.DeviceImage, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(self.actionClick))