In December 2024, RevenueCat became inaccessible in China, affecting IAP functionality in many apps.

官方给出了紧急修复方案：https://www.revenuecat.com/docs/getting-started/configuring-sdk#configuration-for-users-in-mainland-china

Official emergency fix: https://www.revenuecat.com/docs/getting-started/configuring-sdk#configuration-for-users-in-mainland-china

你说巧不巧，就在一周前，我的一个 iOS app 刚通过审核发布成功，就正好使用了 RevenueCat。🤣 没办法，现改实现方案移除 RC 肯定不是一时半会能搞定的，再说这个状态还不确定是不是常态。所以紧急按照官方方案提交了修改。（虽然实际上我的 app 也没啥用户，也没有收到任何消息抱怨说无法购买）。

Coincidentally, my iOS app using RevenueCat was just approved a week ago. 🤣 Instead of removing RC, I quickly applied the official fix, though my app has few users and no complaints yet.

修改后测试效果是可以去到产品信息了（我没有 RC 的 paywall，只是定义了产品），然后按照之前学习过的 App Store Connect 加急审核的步骤走了一遍，没想到的是，加急申请之后，仅仅3分钟就审核通过了🫨。这里给水果审核点个赞，然后再分享加速审核流程。

After the fix, product info was accessible again. I requested an expedited review, and surprisingly, it was approved in just 3 minutes! 🫨 Here’s how to request expedited review:

1. 登录 https://developer.apple.com/ 后，找到页面下方的 Contact Us。

Go to https://developer.apple.com/ and find “Contact Us” at the bottom.

2. 选择 App 审核 -> App 审核加快请求

Choose App Review -> Request Expedited Review

3. 点击 联系 App Review，在 App Information中选择对应的 App 即可。

Click Contact App Review and select your app.

1. Typing “»”

Type “»” in the body of your note, enter the title of the note that you want to link to, and select it from the list. It works both on iOS and macOS.

2. Menu

On iOS, long press to open the options menu. Swipe left the menu to find Add Link.

On macOS, right click in a note and choose Add link in the options menu.

How to navigate back to previous note

Now we have a link to another note, it will jump to the linked note when clicking the link. Then, how can we go back to the previous note?

On iOS, click ... to open menu, select Recent Notes.

On macOS, open View menu to select Previous Note.

I defined the preprocessor macro USING_REVENUE_CAT=1 in my project target’s Build Settings under Preprocessor Macros.

However, when I tried to use it in my Swift file with the following code, I received an error indicating that the module SwiftyStoreKit could not be found. This was puzzling because I expected the macro to work similarly to how it does in Objective-C.

The Solution

Asked both ChatGPT and Cursor for help, and they gave me similar answers as following:

Swift does not recognize preprocessor macros defined in the Build Settings the same way Objective-C does. Instead, you need to define custom flags specifically for Swift.

Steps to Define a Preprocessor Macro for Swift

1. Navigate to Build Settings: Open your project in Xcode and select your target. Then, go to the Build Settings tab.

2. Find Swift Compiler - Custom Flags: Scroll down to the Swift Compiler - Custom Flags section.

3. Add the Custom Flag: In the Other Swift Flags field, add the following:

   USING_REVENUE_CAT
   

This tells the Swift compiler to define the USING_REVENUE_CAT flag, allowing you to use it in your Swift code.

Updated Swift Code

After adding the custom flag, your Swift code should work as intended:

在使用 Xcode 15.4 在 macOS 14.5 上尝试开发 Adobe Illustrator Plugin 时，在编译 Adobe Illustrator 2023 SDK 的 sample 过程中出现错误：

/Users/aidy/Workspace/Adobe Illustrator 2023 SDK/samplecode/StrokeFilter/build/StrokeFilter.build/Default/StrokeFilter.build/Script-FDD9160721AC093D0018B958.sh: line 2: python: command not found
Command PhaseScriptExecution failed with a nonzero exit code

查看 Script-FDD9160721AC093D0018B958.sh 文件内容为：

#!/bin/sh
python ../../tools/pipl/create_pipl.py -input '[{"name":"StrokeFilter","entry_point" : "PluginMain"}]'

二、尝试过程

首先怀疑是没有安装 xcode command line tool，但确认已经安装过了。 接着考虑可能是没有安装 Python。通过 brew install python 安装了 Python3，但 Xcode 中仍然提示python: command not found。 从 Adobe Community 搜索得知这里需要 Python2，于是使用 pyenv 安装了 Python2，并设置 pyenv global 2.7.18。在 Terminal 中执行 python -V 输出是 Python 2.7.18，然而 Xcode build 依旧报错。 尝试了 sudo ln /Users/<user>/.pyenv/shims/python /Library/Developer/CommandLineTools/usr/bin/python，但没有作用。

三、最终解决办法

通过 sudo ln /Users/<user>/.pyenv/shims/python /usr/local/bin/python 设置 /usr/local/bin 的 link，解决了问题。

Problem

There are some environment variabels (e.g. http_proxy) set for current user on Ubuntu 20.4, but when running some commands with sudo (like sudo apt update), those environment variables are not available anymore.

Solution

1. sudo -E

If you are running commands manually, it’s possible to preserve evn setting by adding -E option.

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sudo -E apt update

2. sudo visudo

Using option -E may not work in the cases that the commands with sudo are run in script. To make the specific environment settings shared with sudo, it can be configured with visudo.

Using following command:

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sudo visudo

In opened nano editor, find the line begins with Defaults env_keep, modify it as following to make http_proxy and https_proxy settings be keeped when running commands using sudo:

Defaults        env_keep += "https_proxy http_proxy"

Then, when running sudo apt update, those proxy env variables will kept.

option(ENABLE_ASAN "enable AddressSanitizer" OFF)

if(ENABLE_ASAN)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
    set(CMAKE_CXX_FLAGS "-O -g")
    set(CMAKE_C_FLAGS "-O -g")
endif()

Compile the project:

mkdir build
cd build
cmake -DENABLE_ASAN=ON ..
cmake --build .

After the build, using following command to start the program:

ASAN_OPTIONS=detect_leaks=1 ./a.out

It will print detail info when memory leak occurs.

=================================================================
==12345==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 40 byte(s) in 1 object(s) allocated from:
    #0 0x7f3d8b4fbb90 in __interceptor_new (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde90)
    #1 0x4006d6 in createLeak /path/to/your/project/main.cpp:4
    #2 0x4006f8 in main /path/to/your/project/main.cpp:9
    #3 0x7f3d8b0d283f in __libc_start_main (/lib64/libc.so.6+0x2383f)

SUMMARY: AddressSanitizer: 40 byte(s) leaked in 1 allocation(s).

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sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get install docker-ce

verify the installation

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sudo systemctl status docker

add current user to docker group

• in order to avoid adding sudo when running docker command

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sudo usermod -aG docker ${USER}

Network proxy settings

Dockerd Proxy

To configure the proxy for dockerd, which is managed by systemd, create and edit a configuration file:

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sudo mkdir -p /etc/systemd/system/docker.service.d
sudo touch /etc/systemd/system/docker.service.d/proxy.conf

Add the following to proxy.conf:

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[Service]
Environment="HTTP_PROXY=http://proxy.example.com:8080/"
Environment="HTTPS_PROXY=http://proxy.example.com:8080/"
Environment="NO_PROXY=localhost,127.0.0.1,.example.com"

Replace proxy.example.com:8080 with your proxy address.

Container Proxy

To configure proxy settings for containers, edit ~/.docker/config.json:

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{
 "proxies": {
   "default": {
     "httpProxy": "http://proxy.example.com:8080",
     "httpsProxy": "http://proxy.example.com:8080",
     "noProxy": "localhost,127.0.0.1,.example.com"
   }
 }
}

For container runtime proxies, use the -e option to set environment variables.

Docker Build Proxy

For docker build, inject proxy settings using --build-arg:

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docker build . \
    --build-arg "HTTP_PROXY=http://proxy.example.com:8080/" \
    --build-arg "HTTPS_PROXY=http://proxy.example.com:8080/" \
    --build-arg "NO_PROXY=localhost,127.0.0.1,.example.com" \
    -t your/image:tag

Applying Changes

To apply the changes:

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sudo systemctl daemon-reload
sudo systemctl restart docker

Trouble shooting

when running command sudo apt update, it has following error

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Err:5 https://download.docker.com/linux/ubuntu focal Release                                            
  Could not handshake: The TLS connection was non-properly terminated. [IP: <xx.xxx.xx.xxx> 3128]
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease                                        
Hit:7 http://us.archive.ubuntu.com/ubuntu focal-security InRelease
Reading package lists... Done
E: The repository 'https://download.docker.com/linux/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Solution

According to this answer, modify /etc/apt/apt.config to make sure the proxy settings are correct, especially the https settings.

• Wrong config:

Acquire::http::proxy "http://proxy.mydom.it:8080";
Acquire::https::proxy "https://proxy.mydom.it:8080";

• Good config:

Acquire::http::proxy "http://proxy.mydom.it:8080";
Acquire::https::proxy "http://proxy.mydom.it:8080";

正则表达式写法： Button.*(?:\n.*(?:\n.*)){0,10}.*background

匹配效果：

在准备联系显示器维修之前发现了这个网页 https://zhuanlan.zhihu.com/p/466826180，没想到的是在拔掉显示器电源线再插回去之后，竟然就好了。。。

My AOC monitor, which used to connect to my MacBook Pro with a miniDP-to-DP cable, suddenly stopped working one day.

I tried re-plugging the cable, restarting my computer, and turning the monitor off and on, but nothing worked. So I suspected it might be the cable’s fault and bought a new one, but it still didn’t work. I tried connecting with an HDMI cable and it worked fine.

Before I was about to contact the monitor repair service, I found this webpage: https://zhuanlan.zhihu.com/p/466826180. Surprisingly, after unplugging the monitor’s power cord and plugging it back in, it worked again…