跟读练习: 10 Essential React Native Tips Every Developer Must Know - 通过视频学习英语口语

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You might have worked with React Native for quite some time, but do you really know all the ins and outs?

There are some really small nuggets of wisdom in the React Native docs

or from the day -to -day use that I want to share with you,

so here are 10 practical tips that you can use in your next

React Native project.

The first one is a real quick one about lists and something I shared before.

If you have an input here and you want to hide that keyboard, there's a simple thing that you can add to your list.

So I'm using a flat list here and you can now simply go ahead

and add the keyboard dismiss mode and set it to on drag.

As a result, I can drag the list and it will automatically close the hardware keyboard whenever I do the drag.

Additionally, by the way, you can also quickly make this a really cool animated list.

So I can add and remove things.

But let's just change this to an animated flat list from React Native Reanimated.

And then let's add the item layout animation and let's import the linear transition.

So now I should be able to have a smooth transition whenever I remove items

or add items with just two little changes to an animated flatlist

and the item layout animation and I can also on swipe close my keyboard.

The second tip is about the pressable component.

In most of my tutorials you're gonna see me use the touchable opacity which works great as a button replacement.

However if you are looking for a more extensive

and future -proof way to handle touch base input check out the pressable API

and if you go into the pressable you see

that there's a lot more fine -tuning

you can do like on press in on press out where

you can change the state of your components let's do a quick example i will just change these items

which are currently touchable opacity uh item to oppressable

and instead of just using styles item i can actually now use a function where i use the pressed state

and use that to set either the opacity

or for example the background color

and you can even use

this press state inside the child values here where I currently have the text of the pressable component.

As a result, I can now fine -tune exactly how the click event on

that button and how especially the press event works instead of just using a touchable opacity.

Tip number three is about dark modes and the appearance of our application.

Did you know that you can simply wrap your application using the theme provider from React Navigation

and then include the default theme

and the dark theme to automatically style the elements from react navigation

so in this case you're gonna see

that both the status bar uh the top area up here

and even the background here

because it's using the default background color are changing once i switch the colors here in the simulator this works

because we use the use color theme use color theme hook from react native

which then updates the color theme to either light or dark

and this is applied here in our check wrapped around our application.

You can then also drill this down on component level.

So whenever you want, you can simply import the color theme

and use it as a state to set different styles on your elements.

And if you manually want to toggle this, you can use the appearance API and the set color theme to manually save this.

This works nice in combination with something like async storage or MMKV.

So you can then manually on click toggle this.

However, in the simulator, this usually fails especially when I don't hit save

so now it should work and I can instantly and easily switch between light and dark mode in my app.

Tip number four is once again about colors this time it's about using platform

and the platform color API in the application

so here's a view with three different buttons and

if I go to

that same view on my Android emulator you're gonna see for some reason they look different

and the reason is

that you can use both platform select to switch between different platforms

you can actually not only have oh come on please stay open come on stay open

you can not only ah this is not possible not only switch between ios

and android but also windows mac os web or native

and then you can supply specific colors in your style sheet

and you can not only have fixed colors

but you can also see the platform color here

this is a bit more complicated to use especially figuring out the values for Android is somewhat hard

you have to get into the Android documentation but

if you're interested in this you can actually use the system colors of both iOS

and Android if you want a complete

and even more native feeling in your application tip 5 is about fonts

and especially Google fonts did you know that there's an expo package

that you can use that you can simply install

and then use all the fonts of google let's check

it out i've added the package for the frank rule libra uh font to my application to the layout

and i also use the use fonts hook to safely in

the beginning of my application load all the custom fonts

that i want to use i would usually use and use effect

and make sure fonts loaded is ready

but nonetheless i can now use them on my page inside of the font family

and as a result we see here the bold

and the medium one being applied

it has never been easier to use google fonts in your

react native application than this trust me tip number six is about images

when you use the image component

and you're loading something over the network for example a really big image like this it can sometimes take time

so if i go here it takes a millisecond

and there are sometimes images

that are even bigger now what you can do is you can actually specify a default source

and within that default source you basically set the image

that should be deployed a deployed should be displayed

while the first image is loading so

if I had it like this now I could go into the component

and you quickly saw that react native image

so I just used my local image because

that one should be instantly available you could also have like a simple loader in there as the default source

that would work as well and then you can use any kind of big image

and while it's loading just by default you display your default source in the image element.

Tip number seven is about the text element.

If you have a very long text in your application, there are different ways to improve this.

100

So the first way, if you're rendering really long text, is of course have this in a scroll view.

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But sometimes you also want to limit the number of lines.

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So you can do number of lines on the text element.

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Let's set this to five.

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And this will automatically render only five lines.

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And at the end, you're going to have three dots.

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So you don't need any logic if text length is bigger than 120, then render three dots or something.

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No, you can just set the number of lines.

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However, if you at the same time also want to still show all the things of your text, because now the text of girls truncated,

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you could add a property called adjust font size to fit.

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As a result, this looks quite interesting because in our example, well, eight lines is probably not enough.

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But now we would be able to actually fit all of this in 20 lines of text

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Remember this was our initial state

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and now we would be able to render all of that using adjust font size to fit which will simply

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Specify whether fun should be scaled down automatically to fit given style constraints

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This is not always helpful, but it can be a nice fix in some of your applications

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Tip number eight is about warnings in your application

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So I recently came across a warning that was well not too interesting to me

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Let's say you got this one

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Which of course doesn't come up when I want to show it so encounter two children with the same name

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Of course, that is something you definitely want to fix

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However, sometimes there are things that you just want to ignore because they keep appearing

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Especially if you maybe do a presentation for your customer what you can do is you can simply import lockbox

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From react native we don't need these fences.

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That looks interesting and now i could go ahead

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and use lockbox uh and i got two um

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or different ways i could ignore all locks

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or i could ignore specific locks

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so in my case what i want to ignore is probably encountered uh two children with the same key

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i can now hit save and let's do a reload again

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and i go into and boom no more locks

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and of course the same would work

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if i would use uh logbox .ignorealllocks that's probably a bit more dangerous uh

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because it would hide anything that pops up in your application

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so anyway treat this carefully but if you want some mind space some quiet applications

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and nothing that pops up

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while you work on your application simply use logbox to control the logs that appear in your react native app.

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Tip number nine is about API usage and I was kinda shocked when I saw it.

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So I was using a local API on localhost port 8080

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and we see I have a simple block here where I fetch my data from API URL slash test

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and it worked perfectly fine on iOS.

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However on Android I get an error fetching data.

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Why is that the case?

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Well it turns out that localhost doesn't work on the Android emulator.

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You gonna have a bad day.

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What you can do as a result is you can add this little block at the top,

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which is kinda ugly, but if you put all of your API calls, usually in one or two files,

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into our custom hooks, that should be easy to treat.

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So in my case, I grab the environment using the node environment to make sure we're actually running in development.

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And if we're running in development and the platform is Android, I exchange and patch my API URL, which i usually got from my process environment

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so instead of using localhost port 8080 i'm now using 10 .0 .2 .2 8080 let's hit save

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and let's check out my emulator again so

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if i now go into page 9 voila we have fixed this

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and we can make api calls to localhost on both ios and android

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Just as a quick addition to this, because this might be an ugly hack, here's something else that is recommended.

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So you can also map your port using ADB or down here for ADB devices, you can map the port specifically for your emulator.

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That's probably a tiny bit better than having additional code.

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But if you just want to do a quick test, this one will get the job done.

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Tip number 10 is for all of you who want to build a production application of your React Native application using Expo.

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So usually you're gonna see you have your own custom defcline even if you do a pre -build

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It only works when your live reload is up and running

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But sometimes you just want to have the app installed and leave the room and show it to someone else

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What you can do to build this kind of standalone application is once

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you have created your pre -build with Expo Go into Xcode go up here hit edit scheme and under run configuration

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Here for the build configuration you want to select release

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Go ahead with that, build the application for your device and there's no more connection to a local server.

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Additionally you can of course do the same for Android, so open your project up with Android Studio

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and then at the bottom left you're gonna really small find something called build variants.

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Inside of build variants you see that everything here is set to debug.

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And of course for our app I can now change this to release, it would change all of these to release

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and then I can go up here

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and deploy the app to either my simulator

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or of course any kind of connected android device all right

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that brings us to the end of this quick video

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I hope you enjoyed this quick run through of 10 different things

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that I picked up over the years I took note of them

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I probably will do another video once I reach more than five

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or ten nodes again in the future

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but let me know in the comments what is something that you figured out after years of using

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React Native or you were like, why didn't I know that earlier?

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本课的词汇与口语要点

这节口语课以视频“10 Essential React Native Tips Every Developer Must Know”为素材。视频中反复出现的词有：application, color, react, native, android。这段视频共有 184 个句子、2332 个单词可供跟读。讲话部分时长为 12:00。说话人语速较快，每分钟约 194 个词，会出现较多连读和弱读。 84% 的单词属于英语最常用的 3,000 词，其余的词建议在练习前先学一下。

视频中的重点词汇

视频中 15 个值得学习的单词，附发音和释义：

单词	发音	释义
android 名词	/ˈænˌdɹɔɪd/	人形機器人 /人形机器人, 仿生人
font 名词	/fɑnt/	字體 /字体, 字形
default 名词	/dɪˈfɔlt/	違約 /违约, 暴雷
component 名词	/kəmˈpoʊ.nənt/	元件, 部件
element 名词	/ˈɛləmənt/	要素
ignore 动词	/ɪɡˈnɔː/	無視 /无视, 忽略
keyboard 名词	/ˈki.bɔɹd/	鍵盤 /键盘
custom 名词	/ˈkʌstəm/	習慣 /习惯, 習俗 /习俗
dragon 名词	/ˈdɹæɡən/	лун, 龍 /龙
hook 名词	/hʊk/	鉤 /钩, 鉤子 /钩子
import 名词	/ˈɪm.pɔɹt/	進口貨 /进口货, 舶來品 /舶来品
layout 名词	/ˈleɪ.aʊt/	設計 /设计, 佈局 /布局
deploy 动词	/dɪˈplɔɪ/	部署
manually 副词	/ˈmænj(u)əliː/	手动地
simulator 名词	/ˈsɪmjəˌleɪtɚ/	模拟器

视频中出现的短语动词

单词	发音	释义
check out 动词		退房
figure out 动词		弄清楚
go ahead 动词	/ˌɡoʊ əˈhɛd/	請便 /请便
go up 动词		上昇 /上升, 上去
come up 动词		上來 /上来
pop up 动词		弹出
turn out 动词		原來 /原来

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构	视频中的用法
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的	is applied · being applied · should be deployed
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事	have fixed · i've added · has never been

需要注意的发音

说话人用了 29 次缩略和弱读形式，例如 you're, gonna, don't。请按听到的简短形式来说。

“th” 音: smooth /smuːð/, nonetheless /ˌnʌnðəˈlɛs/
“sh” 和 “zh” 音: transition /tɹænˈzɪʃ.ən/, animation /ˌæn.ɪˈmeɪ.ʃən/, navigation /nævɪˈɡeɪʃən/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/, shock /ʃɔk/
长单词——注意重音位置: manually /ˈmænj(u)əliː/, simulator /ˈsɪmjəˌleɪtɚ/, animation /ˌæn.ɪˈmeɪ.ʃən/, navigation /nævɪˈɡeɪʃən/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: navigation /nævɪˈɡeɪʃən/, variant /ˈvæɹi.ənt/, server /ˈsɝvɚ/, provider /pɹəˈvaɪ.də(ɹ)/, voilà /(v)wɑˈlɑ/
词尾辅音 — 要读清楚，后面不要加元音: react /ɹiːˈækt/, android /ˈænˌdɹɔɪd/, font /fɑnt/, default /dɪˈfɔlt/, component /kəmˈpoʊ.nənt/
/r/ 和 /l/ 的区别: practical /ˈpɹæk.tɪ.kəl/, carefully /ˈkɛɹf(ə)li/, replacement /ɹɪˈpleɪsmənt/, linear /ˈlɪn.i.əɹ/, drill /dɹɪl/

如何用这段视频练习

先完整听一遍视频，不要开口，记下不认识的单词。
先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
录下自己的声音并与原声对比，特别注意 android, font, default 这类单词。

什么是跟读法？

跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。

影子跟读法: 阅读完整分步指南 →

跟读练习: 10 Essential React Native Tips Every Developer Must Know - 通过视频学习英语口语

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