这篇“大前端代码重构之事件拦截iOS Flutter Vue怎么实现”文章的知识点大部分人都不太理解，所以小编给大家总结了以下内容，内容详细，步骤清晰，具有一定的借鉴价值，希望大家阅读完这篇文章能有所收获，下面我们一起来看看这篇“大前端代码重构之事件拦截iOS Flutter Vue怎么实现”文章吧。
app需要支持实现游客模式，启动后直接进入首页菜单，但是进入二级页则自动调用登录页面。总结需求就是父视图拦截子视图的响应事件，思考之后发现在事件响应链上做拦截是最优方法。
absorbing 属性为 true 时，会拦截子视图的事件。点击 button 时只会调用 absorbPointerView（绿色） 的响应方法。
absorbing 属性为 false 时，不会拦截子视图的事件。点击 button 时只会调用 button（蓝色）的响应方法。
import UIKit
import SnapKit
import SwiftExpand
/**
通过递归遍历将所有子视图设置 isUserInteractionEnabled = false,则该视图可以响应事件;
*/
class NNAbsorbPointerViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
edgesForExtendedLayout = []
view.backgroundColor = .white
title = "NNAbsorbPointerView"
absorbPointerView.addSubview(button)
view.addSubview(absorbPointerView)
// view.recursion{ e in
// e.isUserInteractionEnabled = false;
// }
view.addGestureTap { reco in
debugPrint("\(Date()):reco.view")
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let edge = UIEdgeInsets(all: 50)
button.snp.makeConstraints { make in
make.edges.equalToSuperview().inset(edge)
}
absorbPointerView.snp.makeConstraints { make in
make.edges.equalToSuperview().inset(edge)
}
}
lazy var absorbPointerView: NNAbsorbPointerView = {
let view = NNAbsorbPointerView(frame: .zero);
view.absorbing = true;
view.backgroundColor = .green;
view.addGestureTap { reco in
debugPrint("\(Date()):NNAbsorbPointerView")
}
return view
}()
lazy var button: UIButton = {
let view = UIButton(type: .custom);
view.setTitle("UIButton", for: .normal)
view.setTitleColor(.white, for: .normal)
view.backgroundColor = .blue;
view.addGestureTap { reco in
debugPrint("\(Date()):button")
}
return view
}()
}import UIKit
class NNAbsorbPointerView: UIView {
/// 是否拦截响应
var absorbing = false;
// **MARK: - 重写加载方法**
override init(frame: CGRect) {
super.init(frame: frame);
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
}
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
if absorbing {
return self
}
// 1.判断能不能处理事件
if isUserInteractionEnabled == false, isHidden, alpha <= 0.01 {
return nil
}
// 2.判断点在不在当前控件上
if self.point(inside: point, with: event) == false {
return nil;
}
for subView in subviews.reversed() {
let subPoint = self.convert(point, to: subView);
if let targetView = subView.hitTest(subPoint, with: event) {
return targetView;
}
}
return self
}
// **MARK: - 私有方法**
}absorbing 属性为 true 时，会拦截子视图的事件。点击蓝色 Container 时只会调用绿色 Container 的响应方法。
absorbing 属性为 false 时，不会拦截子视图的事件。点击蓝色 Container 时只会调用蓝色 Container 的响应方法。
//
// AbsorbPointerDemo.dart
// flutter_templet_project
//
// Created by shang on 10/25/21 11:05 AM.
// Copyright © 10/25/21 shang. All rights reserved.
//
// AbsorbPointer本身可以接收点击事件，消耗掉事件，而IgnorePointer无法接收点击事件，其下的控件可以接收到点击事件（不是子控件）。
import "package:flutter/material.dart";
import 'package:flutter_templet_project/extension/ddlog.dart';
class AbsorbPointerDemo extends StatefulWidget {
const AbsorbPointerDemo({Key? key}) : super(key: key);
@override
_AbsorbPointerDemoState createState() => _AbsorbPointerDemoState();
}
class _AbsorbPointerDemoState extends State<AbsorbPointerDemo> {
bool _disable = false;
bool _switchValue = false;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Absorbpointer'),
centerTitle: true,
elevation: 0,
),
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Row(
children: <Widget>[
Text('不可点击：absorbing: ${_disable}'),
Switch(
value: _disable,
onChanged: (bool val) {
_disable = val;
setState(() {});
},
)
],
),
Divider(),
_buildAbsorbPointerNew(absorbing: _disable),
MaterialButton(
color: Colors.lightBlue,
onPressed: () => onClick('我是外面的按钮，不受影响'),
child: Text('我是外面的按钮，不受影响'),
),
],
),
);
}
/// 默认吸收事件，拦截事件
_buildAbsorbPointerNew({bool absorbing = true}) {
return InkWell(
onTap: () => onClick("outside"),
child: Container(
color: Colors.green,
padding: EdgeInsets.all(20),
child: AbsorbPointer(
absorbing: absorbing,
child: InkWell(
onTap: () => onClick("inside"),
child: Container(
color: Colors.blue,
width: 200.0,
height: 100.0,
alignment: Alignment.center,
child: Text("Container"),
),
),
),
),
);
}
onClick(String msg) {
debugPrint(msg);
}
}实现很简单，@click 添加修饰符 capture.stop 即可拦截子标签事件。
点击 button 时，父视图（绿色）会拦截响应事件。
<template>
<h3>{{ $route.meta.title }}</h3>
<!-- <h3>{{ JSON.stringify(route) }}</h3> -->
<div class="page" @click.capture.stop="doThis">
<button @click="onClick">button</button>
</div>
</template>
<script setup>
import { getCurrentInstance, ref, reactive, watch, onMounted, } from 'vue';
import { useRouter, useRoute } from 'vue-router';
const router = useRouter();
const route = useRoute();
const doThis = () => {
console.log(`${new Date()}: doThis`);
};
const onClick = () => {
console.log(`${new Date()}: onClick`);
};
</script>
<style scoped lang='scss'>
.page{
background-color: green;
}
</style>以上就是关于“大前端代码重构之事件拦截iOS Flutter Vue怎么实现”这篇文章的内容，相信大家都有了一定的了解，希望小编分享的内容对大家有帮助，若想了解更多相关的知识内容，请关注亿速云行业资讯频道。
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