做网站推广那家好,网络运营维护的工作内容,企业网站网页尺寸,网站dedecms数据库本节将通过纯代码进行封装自定义View控件#xff0c;以常用的设置页的item为例#xff0c;实现UI效果如下#xff1a; 1、创建SettingView继承自UIView
import UIKitclass SettingView: UIView {}
2、重写 init() 和 required init?(coder: NSCoder) 方法
纯代码创建Set…本节将通过纯代码进行封装自定义View控件以常用的设置页的item为例实现UI效果如下 1、创建SettingView继承自UIView
import UIKitclass SettingView: UIView {}
2、重写 init() 和 required init?(coder: NSCoder) 方法
纯代码创建SettingView会执行到init()而required init?(coder: NSCoder)则是用于可视化布局时所以两个方法都必须重写。
import UIKitclass SettingView: UIView {init() {super.init(frame: CGRect.zero)innerInit()}required init?(coder: NSCoder) {super.init(coder: coder)innerInit()}func innerInit() {}}
3、约束设置
当视图加入父视图时才能进行约束设置故需要重写 didMoveToSuperview()并在didMoveToSuperview()方法里面编写约束设置。
import UIKitclass SettingView: UIView {init() {super.init(frame: CGRect.zero)innerInit()}required init?(coder: NSCoder) {super.init(coder: coder)innerInit()}func innerInit() {}/// 当视图加入父视图时 / 当视图从父视图移除时调用override func didMoveToSuperview() {super.didMoveToSuperview()//添加约束}
}
4、完整自定义view代码
//
// SettingView.swift
// SnapKitTest
//
// Created by jin on 2024/8/13.
//import UIKitclass SettingView: UIView {init() {super.init(frame: CGRect.zero)innerInit()}required init?(coder: NSCoder) {super.init(coder: coder)innerInit()}func innerInit(){backgroundColor .whiteaddSubview(leftImgView)addSubview(rightImgView)addSubview(titleView)}/// 当视图加入父视图时 / 当视图从父视图移除时调用override func didMoveToSuperview() {super.didMoveToSuperview()//添加约束leftImgView.snp.makeConstraints { make inmake.left.equalToSuperview().offset(16)make.centerY.equalToSuperview()make.width.equalTo(20)make.height.equalTo(20)}titleView.snp.makeConstraints { make inmake.left.equalTo(leftImgView.snp.right).offset(16)make.centerY.equalToSuperview()}rightImgView.snp.makeConstraints { make inmake.right.equalToSuperview().offset(-16)make.centerY.equalToSuperview()make.width.equalTo(20)make.height.equalTo(20)}}///左侧图标lazy var leftImgView: UIImageView {let imageView UIImageView()imageView.image UIImage(named: Setting)return imageView}()///右侧图标lazy var rightImgView: UIImageView {let imageView UIImageView()imageView.image UIImage(named: Arrow)return imageView}()///标题lazy var titleView: UILabel {let textView UILabel()textView.text 标题return textView}()
}5、使用自定义View
view.addSubview(settingView)//添加约束只有添加当前控件内部的约束在控件内部就添加了
settingView.snp.makeConstraints { make inmake.top.equalTo(view.safeAreaLayoutGuide.snp.top)make.width.equalToSuperview()make.height.equalTo(55)
}lazy var settingView: SettingView {let view SettingView()view.titleView.text 设置view.leftImgView.image UIImage(named: Setting)return view
}()
6、设置View点击事件
objc func onSettingClick(recognizer:UITapGestureRecognizer) {print(onSettingClick)
}lazy var settingView: SettingView {let view SettingView()view.titleView.text 设置view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onSettingClick(recognizer:))))return view
}()
7、使用自定义View的完整代码
//
// SettingController.swift
// SnapKitTest
//
// Created by jin on 2024/8/13.
//import UIKitclass SettingController: UIViewController {override func viewDidLoad() {super.viewDidLoad()view.backgroundColor .systemGroupedBackgroundtitle 设置界面view.addSubview(settingView)view.addSubview(collectView)//添加约束只有添加当前控件内部的约束在控件内部就添加了settingView.snp.makeConstraints { make inmake.top.equalTo(view.safeAreaLayoutGuide.snp.top)make.width.equalToSuperview()make.height.equalTo(55)}collectView.snp.makeConstraints { make inmake.top.equalTo(settingView.snp.bottom).offset(1)make.width.equalToSuperview()make.height.equalTo(55)}}objc func onSettingClick(recognizer:UITapGestureRecognizer) {print(onSettingClick)}objc func onCollectClick(recognizer:UITapGestureRecognizer) {print(onCollectClick)}lazy var settingView: SettingView {let view SettingView()view.titleView.text 设置view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onSettingClick(recognizer:))))return view}()lazy var collectView: SettingView {let view SettingView()view.titleView.text 收藏view.leftImgView.image UIImage(named: Setting)view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onCollectClick(recognizer:))))return view}()}至此一个简单的纯代码封装自定义View控件便实现了。
