How uniapp intercepts the return of the native navigation bar

As the use of mobile applications becomes more and more popular, as mobile application developers, we not only pay attention to the appearance and functionality of the application, but also deal with some problems that may occur in the application. One of them is the interception of the native navigation bar back button.

For cross-platform development frameworks like uniapp, we can use some technical means to intercept the native navigation bar return button. In this article, we will explain how to achieve this using the built-in features of the uniapp framework.

1. Review of uniapp basic knowledge

Before understanding how uniapp intercepts the native navigation bar return button, we need to review the basic knowledge of uniapp.

uniapp is a cross-platform development framework based on Vue.js. You can use one set of code to write applications for multiple platforms, such as WeChat applets, H5 applications, Android applications, iOS applications, etc. . It provides some built-in functions, such as routing, components, API, etc., to facilitate us to develop different functions of the application.

2. The need to intercept the return button of the native navigation bar

In the application, we may encounter the need to intercept the return button of the native navigation bar. For example, in the application, we need to pop up a confirmation box and ask the user if they want to return to the previous page. If the user clicks Confirm, then they can return to the previous page; if the user clicks Cancel, then they will stay on the current page.

3. How to intercept the native navigation bar return button

To intercept the native navigation bar return button, we need to use the built-in function provided by uniapp, that is, the beforeRouteLeave function. In Vue.js, the beforeRouteLeave function is a very important function in the route navigation hook, which allows us to perform some operations before leaving the current route.

In the development of uniapp, we can intercept the native navigation bar return button in the following ways:

1. In the uniapp global configuration file, register the beforeRouteLeave function.

export default {
    //...
    beforeRouteLeave(to, from, next) {
        //在这里编写你需要执行的操作
        //如果需要拦截原生导航栏返回按钮，请调用next(false)
    },
    //...
}

2. In the beforeRouteLeave function, write logical judgment and business logic processing.

For example, in the beforeRouteLeave function, we can pop up a confirmation box and ask the user if they need to return to the previous page.

export default {
    //...
    beforeRouteLeave(to, from, next) {
        //弹出一个确认框
        uni.showModal({
            title: '提示',
            content: '确定要回到上一页吗？',
            success: function (res) {
                //如果用户点击了确认，那么可以返回上一页
                if (res.confirm) {
                    next();
                }
                //如果用户点击了取消，那么停留在当前页面，拦截原生导航栏返回按钮
                else if (res.cancel) {
                    next(false);
                }
            }
        });
    },
    //...
}

In the above code, we use the uni.showModal function to pop up a confirmation box. If the user clicks the confirm button, then call the next() function to return to the previous page; if the user clicks the cancel button, then call the next(false) function to stay on the current page and intercept the native navigation bar return button.

4. Summary

So far, we have introduced how uniapp intercepts the native navigation bar return button. In the actual development process, we can write logical code as needed to handle different business needs. By using the built-in functions and APIs provided by uniapp, we can easily develop applications for different platforms and handle some common problems in the application.

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