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#!/bin/bash

# ---------------------------------------------------------------------------------------------------------
# place as many old macOS SDKs into the directory with this script e.g. if you have
#
#  my-macpro:SDKs natb$ ls -ahl
#  total 4254792
#  drwxr-xr-x  17 natb  admin   578B Nov 21  2017 .
#  drwxrwxr-x  24 root  admin   884B Aug 29 06:46 ..
#  drwxr-xr-x   5 natb  admin   170B Oct 17  2017 MacOSX10.10.sdk

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Use previous/older SDKs with Xcode

Since monterey update does not allow us to use Xcode previous than 13, let's show how to "install previous SDKs"

Needed

Swift toolchains, from https://swift.org/download/

Previous Xcode.xip, from the https://developer.apple.com

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SDK_VERSION=$1
SDK_NAME="MacOSX${SDK_VERSION}.sdk"
TAR_FILE_NAME="${SDK_NAME}.tar.xz"
DOWNLOAD_URL="https://github.com/phracker/MacOSX-SDKs/releases/download/MacOSX10.11.sdk/${TAR_FILE_NAME}"
TAR_FILE_DEST="/tmp/${TAR_FILE_NAME}"
SDK_MIN_VERSION_FILE="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist"
SDK_DIR="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/"

echo Downloading $SDK_NAME
curl -L $DOWNLOAD_URL -o $TAR_FILE_DEST --progress-bar

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final class SampleViewController: StoryboardBackedViewController {
    // Unfortunately this must be an IUO var, so that we can set the value after super.init
    private var member: Foo!
    
    // Proper dependency injection in a storyboard backed VC!
    init(foo: Foo) {
        super.init(storyboardIdentifier: "SampleViewControllerIdentifier")

        // We have to set the members *after* calling super.init, since it changes the instance of `self`.
        self.member = foo

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Material Animations

[Android Transition Framework][transition-framework] can be used for three main things:

1. Animate activity layout content when transitioning from one activity to another.
2. Animate shared elements (Hero views) in transitions between activities.
3. Animate view changes within same activity.

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import android.os.SystemClock;
import android.support.v4.util.LruCache;

import java.util.HashMap;
import java.util.Map;

/**
 * An Lru Cache that allows entries to expire after
 * a period of time. Items are evicted based on a combination
 * of time, and usage. Adding items past the {@code maxSize}

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To remove a submodule you need to:

Delete the relevant line from the .gitmodules file.
Delete the relevant section from .git/config.
Run git rm --cached path_to_submodule (no trailing slash).
Commit and delete the now untracked submodule files.

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Android Tools Attributes

Android has a dedicated XML namespace intended for tools to be able to record information in XML files, and have that information stripped when the application is packaged such that there is no runtime or download size penalty. The namespace URI is http://schemas.android.com/tools and is usually bound to the tools: prefix:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"

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public class SomeFragment extends Fragment {
 
	MapView mapView;
	GoogleMap map;
 
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.some_layout, container, false);