swift微博第8天(自定义标题按钮)

import UIKit
class TittleBtn: UIButton {
// 初始化视图
   override init(frame: CGRect) {
    super.init(frame: frame)
    setTitleColor(UIColor.JKTextGayColor(), for: UIControlState.normal)
    setImage(UIImage(named:"navigationbar_arrow_down"), for: UIControlState.normal)
    setImage(UIImage(named:"navigationbar_arrow_up"), for: UIControlState.selected)
    sizeToFit()
   }
   // 防止storyboard崩溃
   required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
   }
   // 调整图片和文字的位置
   override func layoutSubviews() {
     super.layoutSubviews()
     titleLabel?.x = 0
     imageView?.x = titleLabel!.width
    }
}

let btn = TittleBtn()
   btn.setTitle("极客江南 ", for: UIControlState.normal)
   btn.addTarget(self, action: #selector(HomeViewController.tittleClick(btn:)), for: UIControlEvents.touchUpInside)
   navigationItem.titleView = btn

@objc private func tittleClick(btn:TittleBtn){
    print("标题的点击方法")
    btn.isSelected = !btn.isSelected
}