ios - 如何让导航按钮位于导航栏的左上角

Question

我在导航栏中有一个以编程方式制作的导航按钮，我试图在按钮上制作图像(如后退按钮)并且我做到了，但我的问题是，该按钮没有出现在左上角，它出现了在一些空格之后。

 let button = UIButton(type: .system)
    button.frame = CGRect(x: 0, y: 0, width: 10, height: 40)
    button.setTitle("Back", for: .normal)
    button.setImage(UIImage(named: "ic_keyboard_arrow_left_2x"), for: .normal)
    let barButton = UIBarButtonItem(customView: button)
    self.navigationItem.leftBarButtonItems = [barButton]

请帮助我完成任务

Answer 1

将所有代码替换为:

self.navigationItem.backBarButtonItem = UIBarButtonItem(image: UIImage(named: "ic_keyboard_arrow_left_2x"), style: .plain, target: self, action: #selector(yourSelector))  
self.navigationController?.navigationBar.topItem?.title = "Back"