UISearchBar的封装和自定义

示例图>>

封装>>>

import UIKit
// UISearchBar
class CNSearchBar: UISearchBar {
    typealias CNSearchBarShouldBeginEditingBlock = (String) -> Void
    var BlockShouldBeginEditing: CNSearchBarShouldBeginEditingBlock?
    
    // MARK: Properties
    // MARK: LifeCycle
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.delegate = self
        // 去掉顶部和底部黑线
        self.backgroundImage = UIImage()
        self.placeholder = "搜索"
        self.sizeToFit()
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}
// MARK: Extension
extension CNSearchBar: UISearchBarDelegate {
    
    // 将要开始编辑
    func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {     return true    }
    // 已经开始编辑
    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {     }
    // 将要结束编辑
    func searchBarShouldEndEditing(_ searchBar: UISearchBar) -> Bool {        return true    }
    // 已经结束编辑
    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {    }
    // 内容已经改变
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)
    {
        self.BlockShouldBeginEditing!(searchBar.text!)
    }
    // 取消按钮点击
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar)
    {
        searchBar.endEditing(true)
        searchBar.setShowsCancelButton(false, animated: true)
    }
    // 搜索按钮点击
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar)
    {
        searchBar.setShowsCancelButton(false, animated: true)
        searchBar.resignFirstResponder()
        self.BlockShouldBeginEditing!(searchBar.text!)
        
    }
    
}

使用时的个性化设置>>>

let sear = CNSearchBar()
// 设置图标
sear.setImage(UIImage(named: "Scope_BusinessNo"), for: UISearchBar.Icon.search, state: UIControl.State.normal)
// 背景色
sear.backgroundColor = UIColor.white.withAlphaComponent(0.4)
// 光标的颜色
sear.tintColor = UIColor.white
//  
if #available(iOS 13.0, *) {
    sear.searchTextField.font = UIFont.adjustFontSize(ofSize: 12)
    sear.searchTextField.textColor = UIColor.white
    sear.searchTextField.backgroundColor = UIColor.clear
} else {
    let textFiled = sear.value(forKey: "searchField") as! UITextField
    textFiled.font = UIFont.adjustFontSize(ofSize: 12)
    textFiled.textColor = UIColor.white
    textFiled.backgroundColor = UIColor.clear
}
// 圆角        
sear.layer.cornerRadius = 13
sear.clipsToBounds = true

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
     // 设置占位符的字体和颜色   
  if #available(iOS 13.0, *) {
    searchBar.searchTextField.attributedPlaceholder = NSAttributedString(string: "搜索", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white, NSAttributedString.Key.font: UIFont.systemFont(ofSize: 12)])
  } else {
    let textFiled = searchBar.value(forKey: "searchField") as! UITextField
    textFiled.attributedPlaceholder = NSAttributedString(string: "搜索", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white, NSAttributedString.Key.font: UIFont.adjustFontSize(ofSize: 12)])
  }
}