Swift在导航栏多个按钮_Swift设置navigation左右两侧多个按钮

IOS App开发难免会遇到导航栏右上角需要显示2个按钮的时候，今天就讲一下Swift在导航栏左侧或者右侧放置多个按钮例子，使用 navigationItem.leftBarButtonItem 和 navigationItem.rightBarButtonItem 可以很方便的分别设置导航栏左侧和右侧按钮，但一侧只能有一个按钮。如果想要在一侧使用多个按钮，可以通过 leftBarButtonItems 和 rightBarButtonItems 来实现。

设置按钮

override func viewDidLoad(){
    super.viewDidLoad()
    
    //navitem search 搜索按钮
    let buttonSearch = UIButton.init(frame: CGRect.init(x: 0, y: 0, width: 20, height: 20))
    buttonSearch.setImage(UIImage.init(named: "home_navitem_search"), for: UIControlState.normal)
    buttonSearch.addTarget(self, action: #selector(navigationItemSearchAction), for: UIControlEvents.touchUpInside)
    let barButtonSearch = UIBarButtonItem(customView: buttonSearch)
    
    //navitem 客服按钮
    let buttonService = UIButton.init(frame: CGRect.init(x: 0, y: 0, width: 20, height: 20))
    buttonService.setImage(UIImage.init(named: "customer_service"), for: UIControlState.normal)
    buttonService.addTarget(self, action: #selector(navigationItemServiceAction), for: UIControlEvents.touchUpInside)
    let barButtonService = UIBarButtonItem(customView: buttonService)
    
    //按钮间的空隙
    let gap = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: nil, action: nil)
    gap.width = 12;
    
    //用于消除右边边空隙，要不然按钮顶不到最边上
    let spacer = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: nil, action: nil)
    spacer.width = -5;
    
    //设置按钮（注意顺序）
    self.navigationItem.rightBarButtonItems = [spacer, barButtonSearch, gap, barButtonService]
    
}

点击事件

//搜索
@objc func navigationItemSearchAction() {
    print("搜索按钮点击")
}

//客服
@objc func navigationItemServiceAction() {
    print("客服按钮点击")
}