更改导航栏按钮项目的标题

let button = UIButton()
        button.setImage(UIImage(named: "coin_icon"), forState: UIControlState.Normal)
        button.addTarget(self, action:#selector(Profile.goCoin), forControlEvents: UIControlEvents.TouchDragInside)
        button.frame=CGRectMake(0, 0, 30, 30)
        let barButton = UIBarButtonItem(customView: button)
        self.navigationItem.rightBarButtonItem = barButton

我的代码是在导航栏上添加一个栏按钮。

但是，我需要更改函数中按钮的标题

func changetitle() {
self.navigationItem.rightBarButtonItem?.title = "Change"
}

我尝试了这个，但没有成功。

我怎样才能改变这个按钮的标题？

您需要访问UIButton来自UIBarButtonItem并更改标题UIButton.

func changetitle() {
    let item = self.navigationItem.rightBarButtonItem!
    let button = item.customView as! UIButton
    button.setTitle("Change", for: .normal)
}