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Author Archives: Tang
How to delete an App from command line
1. List all simulators Find out all simulators xcrun simctl list Find out active simulator xcrun simctl list | grep Booted You will get the result like: $ xcrun simctl list |grep Booted iPhone 11 (AE8852AB-378E-47FB-BD23-4CF77BFBC6DC) (Booted) Now you can … Continue reading
Combine Asynchronous Programming
1 Combine basics Combine is a declarative, reactive framework for processing asynchronous events over time. It aims to solve existing problems, like unifying tools for asynchronous programming, dealing with mutable state and making error handling a starting team player. Combine … Continue reading
Configure Visual Studio Code for Swift development
1. Build sourcekit-lsp https://github.com/apple/sourcekit-lsp#building-sourcekit-lsp $ git clone https://github.com/apple/sourcekit-lsp.git $ swift package update $ swift build  The sourcekit-lsp will be here: /Users/zhihuitang/repo/common/sourcekit-lsp/.build/x86_64-apple-macosx/debug/sourcekit-lsp 2. Configure sourcekit-lsp In the sourcekit-lsp settings, set the Language Server Mode to sourcekit-lsp  Set Server Path: … Continue reading
HOW TO RUN VISUAL STUDIO CODE FROM ZSH ON MAC OSX
Adding the codefunction to .zshrc file: function code { if [[ $# = 0 ]] then open -a "Visual Studio Code" else local argPath="$1" [[ $1 = /* ]] && argPath="$1" || argPath="$PWD/${1#./}" open -a "Visual Studio Code" "$argPath" fi … Continue reading
MongoDB on Mac
1.What’s MongoDB? MongoDB is a document database which belongs to a family of databases called NoSQL – not only SQL. In MongoDB, records are documents which behave a lot like JSON objects in JavaScript. Values in documents can be looked … Continue reading
Python3 Virtualenv Setup
Install python3 brew install python3 Pip3 is installed with Python3 Upgrade virtualenv To install virtualenv via pip run: pip install –upgrade virtualenv Create virtualenv virtualenv -p python3 python3-venv Activate the virtualenv source python3-venv/bin/activate Deactivate the virtualenv deactivate
LLDB you should know
LLDB is a next generation, high-performance debugger. It is built as a set of reusable components which highly leverage existing libraries in the larger LLVM Project, such as the Clang expression parser and LLVM disassembler. LLDB is the default debugger … Continue reading
Xcode instruments
 The two columns worth noting in Instruments are # Persistent and # Transient. The Persistent column keeps a count of the number of objects of each type that currently exist in memory. The Transient column shows the number of … Continue reading
Git tips
How do I discard changes in my working copy that are not in the index? git stash save –keep-index –include-untracked You don't need to include –include-untracked if you don't want to be thorough about it. or drop the stash git … Continue reading
Views vs. layers
A layer is a simple model class that exposes a number of properties to represents some image-based content. Every UIView is backed by a layer, so you can think of layers as the lower-level behind the scenes class behind your … Continue reading