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。 

下面演示给导航栏右侧添加两个按钮（搜索和设置）：

同时两个按钮间设置了间距，并将设置按钮顶到边上。

import UIKit
 
class ViewController: UIViewController {
 
    override func viewDidLoad() {
        super.viewDidLoad()
         
        //搜索按钮
        let button1 = UIButton(frame:CGRectMake(0, 0, 18, 18))
        button1.setImage(UIImage(named: "search"), forState: .Normal)
        button1.addTarget(self,action:Selector("tapped1"),forControlEvents:.TouchUpInside)
        let barButton1 = UIBarButtonItem(customView: button1)
         
        //设置按钮
        let button2 = UIButton(frame:CGRectMake(0, 0, 18, 18))
        button2.setImage(UIImage(named: "settings"), forState: .Normal)
        button2.addTarget(self,action:Selector("tapped2"),forControlEvents:.TouchUpInside)
        let barButton2 = UIBarButtonItem(customView: button2)
         
        //按钮间的空隙
        let gap = UIBarButtonItem(barButtonSystemItem: .FixedSpace, target: nil,
            action: nil)
        gap.width = 15;
         
        //用于消除右边边空隙，要不然按钮顶不到最边上
        let spacer = UIBarButtonItem(barButtonSystemItem: .FixedSpace, target: nil,
            action: nil)
        spacer.width = -10;
         
        //设置按钮（注意顺序）
        self.navigationItem.rightBarButtonItems = [spacer,barButton2,gap,barButton1]
    }
     
    func tapped1(){
        print("搜索按钮点击")
    }
     
    func tapped2(){
        print("设置按钮点击")
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

好了以上就是关于ios开中导航栏的放多个按钮的例子。