swift - 重叠 UINavbar 左侧项目

Question

在我的 swift iOS 8 项目中，我将后退按钮图像更改为后退箭头，并使用 AppDelegate 中的以下代码删除了后退项目文本，但仍然得到了重叠的项目。

 UINavigationBar.appearance().backIndicatorImage = UIImage(named: "GoBack")!
 let backImg: UIImage = UIImage(named: "GoBack")!
 UIBarButtonItem.appearance().setBackButtonBackgroundImage(backImg, forState: .Normal, barMetrics: .Default)

如何删除文字？

Answer 1

只需再添加一行:

UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default)

另一种使用自定义按钮为栏按钮设置图像的方法:

let button: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
button.setImage(UIImage(named: "GoBack"), forState: UIControlState.Normal)
button.addTarget(self, action: "backButtonPressed:", forControlEvents: UIControlEvents.TouchUpInside)
button.frame = CGRectMake(0, 0, 53, 31)  // set this as per your need.

let barButton = UIBarButtonItem(customView: button)
self.navigationItem.leftBarButtonItem = barButton

它的辅助方法:

func backButtonPressed(sender:UIButton) {
    navigationController?.popViewControllerAnimated(true)
}