akingdom

// Example of printing a source code line at an error position
// (based on an index within the entire source code)
//
// By Andrew Kingdom
// MIT license
// (and use at own risk)
//
// Example prints:
//
//    DEFGH

akingdom

// Android build.gradle
// How to auto-increment the version.
// There are many ways to do this - this is only one example. Its downside is that it updates the gradle file (which will ask for a Sync when opened).
// Note that the 10001 (rather than just 1) is ensure there are enough digits to prevent comparison/sorting issues.
//
// By Andrew Kingdom
// MIT license
// (and use at own risk)
//

akingdom

Add the App Sandbox capability to an Xcode project when it is missing from the standard capabilities area.

(Straightforward to do but a pain to remember.)

1. If your project lacks a .entitlements file, create a new one:

• Menu: View > Navigators > Project
• Select the root level (project icon) of your project
• Menu: File > New > File...
• Use the Property List template

akingdom

// Objective C
// Display initial screen before final UIViewController loads (e.g. Login credentials)
//
// By Andrew Kingdom
// MIT license
// 
// Instructions:
// 
// On the main storyboard, create your login screen as, say, a subclass of UIViewController. 
// Make sure it is the initial scene (check Is Initial View Controller).

akingdom

// Android Java
// How to programmatically control whether the screen may or may not turn off.
//
// By Andrew Kingdom
// MIT license
//

package com.example.sample;

import android.os.Bundle;

akingdom

// Android Java
// How to check if the app is a debug build versus a release build.
//
// By Andrew Kingdom
// MIT license
//

public class MainActivity extends AppCompatActivity {

    // Returns true if the app is debuggable

akingdom

// Swift 5.0 + Javascript
// How to use 'new <classtype>' in Javascript to instantiate a Swift object (from JavaScriptCore).
//
// I couldn't find this clearly documented in any one place.
//
// By Andrew Kingdom
// MIT license
//
@objc
public protocol SampleProtocol: JSExport {

akingdom

Swift 5.0

Swift 5.0 cannot use the #ffffff syntax directly. Here is the code I use for web-related projects. Supports alpha and three-digits.

Usage example (uppercase values are fine too):

    let hex = "#FADE2B"  // yellow
    let color = UIColor(fromHex: hex)

akingdom

// Objective C++
// Detects whether this is an initial or subsequent launch of this app.
//
// By Andrew Kingdom
// MIT license
// 
static BOOL _appDidLaunchPreviously;
static BOOL _appDidLaunchPreviously_known;
static NSString * kAppDidLaunchPreviously = @"priorLaunch";
static NSString * vAppDidLaunchPreviously = @"Y";

akingdom

Useful Excel Spreadsheet Formulas
---------------------------------
By Andrew Kingdom
MIT license

Shows the number of weeks covering two dates. This works across year boundaries. This is not the same as the number of weeks between two dates.
[B7]	2022-11-23	Date 1
[B8]	2023-01-15	Date 2
[B9]	=ROUNDUP(((B8-WEEKDAY(B8,1)+7)-(B7-WEEKDAY(B7,1)+1))/7,0)