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，但它只显示一个矩形框，并不显示实际的图像。
func setupBrowserToolbar() { let browser = UIToolbar(frame: CGRect(x: 0, y: 20, width: self.view.frame.width, height: 30)) //configuration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button1 let btngrap1 = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil) //前进button let btnforward = UIBarButtonItem(image: UIImage(named: "forward.png"), style: UIBarButtonItemStyle.Plain, target: self, action: Selector("forwardClicked:")) //分割button2 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button3 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) } 我的应用程序屏幕快照
上述方法是工具栏configuration，但我不知道什么是错的。
那是因为UIBarButtonItem图像的默认渲染模式总是将图像作为模板图像，忽略其颜色信息（UIImageRenderingModeAlwaysTemplate）。 只需使用UIImage的方法imageWithRenderingMode创build您的图像总是原来的。
UIImage(named: "yourImageName")!.imageWithRenderingMode(.AlwaysOriginal)
斯威夫特3，4更新
从swift 3开始，方法改变为以下格式
UIImage(named:"yourImageName")!.withRenderingMode(.alwaysOriginal)