swift navigationItem titleButton

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titleButton是系统不能满足需求而且自己封装的button。

import UIKitclass TitleButton: UIButton {    override init(frame : CGRect) {        super.init(frame: frame)        setImage(UIImage(named: "tabbar_discover"), for: .normal)        setImage(UIImage(named: "tabbar_discover_selected"), for: .selected)        setTitleColor(UIColor.black, for: .normal)        sizeToFit()    }    // 必须实现    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    override func layoutSubviews() {        super.layoutSubviews()        titleLabel!.frame.origin.x = 0        imageView!.frame.origin.x = titleLabel!.frame.size.width + 5    }}

创建好titleButton之后使用titleButton

let titleBtn : TitleButton = TitleButton()        titleBtn.setTitle("txwDemo", for: .normal)        titleBtn.addTarget(self, action: #selector(OneVC.titleBtnClick), for: .touchUpInside)        navigationItem.titleView = titleBtn

// 监听标题按钮点击extension OneVC {    func titleBtnClick(titleBtn :TitleButton){        // 改变按钮状态        titleBtn.isSelected = !titleBtn.isSelected        //        let vc = UIViewController()        self.present(vc, animated: true, completion: nil)    }}

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