将自定义图像设置为 UIBarButtonItem 但它不显示任何图像

我想将自定义图像设置为 UIBarButtonItem 但它只显示周围的矩形框并且不显示实际图像。

func setupBrowserToolbar() {
    let browser = UIToolbar(frame: CGRect(x: 0, y: 20, width: self.view.frame.width, height: 30))
    //配置返回组件
    let path = NSBundle.mainBundle().pathForResource("back", ofType: "png")
    let urlstr = NSURL(fileURLWithPath: path!)
    let data = NSData(contentsOfURL: urlstr)
    let btnback = UIBarButtonItem(image: UIImage(data: data!), style: UIBarButtonItemStyle.Plain, target: self, action: Selector("backClicked:"))
    //分割按钮1
    let btngrap1 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    //前进按钮
    let btnforward = UIBarButtonItem(image: UIImage(named: "forward.png"), style: UIBarButtonItemStyle.Plain, target: self, action: Selector("forwardClicked:"))
    //分割按钮2
    let btngrap2 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    //重新加载
    let btnreload = UIBarButtonItem(image: UIImage(named: "reload.png"), style: UIBarButtonItemStyle.Plain, target: self, action: Selector("reloadClicked:"))
    //分割按钮3
    let btngrap3 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    //停止加载
    let btnstop = UIBarButtonItem(image: UIImage(named:"stop.png"), style: UIBarButtonItemStyle.Plain, target: self, action: Selector("stopClicked:"))
    progress = UIProgressView((frame: CGRect(x: 0, y: 48, width: self.view.frame.width-50, height: 2)))
    progress.progress = 0
    browser.setItems([btnback, btngrap1, btnforward, btngrap2, btnreload, btngrap3, btnstop], animated: true)
    ptimer = NSTimer(timeInterval: 0.2, target: self, selector: Selector("loadProgress"), userInfo: nil, repeats: true)
    self.view.addSubview(browser)
}

我的应用程序屏幕截图 https://i.stack.imgur.com/VkOkZ.png

上面的方法是工具栏配置但我不知道哪里错了。

这是因为 UIBarButtonItem 图像的默认渲染模式始终将图像绘制为模板图像，忽略其颜色信息 (UIImageRenderingModeAlwaysTemplate)。只需使用 UIImage 的方法 imageWithRenderingMode 始终保持原始图像即可创建图像。

UIImage(named: "yourImageName")!.withRenderingMode(.alwaysOriginal)