AT - Hunger has no scenic route

RxSwift: Use of unresolved identifier 'Resources'

RxSwift.Resources are being used to detect memory leaks during pre release tests. Solving Use of unresolved identifier 'Resources' error.

git

OpenSSL: sign and verify data

Sign and Verify with OpenSSL command line tools.

android

How to choose minSdkVersion, targetSdkVersion, and compileSdkVersion

minSdkVersion (lowest possible) <= targetSdkVersion == compileSdkVersion (latest SDK) Full article.

git

Git error: cannot lock ref ...

Problem: A nasty Git error that can come in different forms: error: cannot lock ref (unable to update local ref) error: cannot lock existing info/refs fatal: git-http-push failed Solution: git remote prune origin git gc --prune=now

git

Keeping git history clean

Rebase git rebase helps maintain repository's homeostasis or in other words helps maintain history clean. git rebase -i 95eeee3^ -i begins an interactive rebasing session Interactive mode will bring the following list of commands: p, pick = use commit r, reword = use commit, but edit

swift

Unwanted padding in UICollectionView in iOS 10

The issue: On iOS 10, a collection view embedded in a view has unexpected padding at the top. Interestingly, works just fine on iOS 11. Debugging shows that collection view contentSize is correct but contentOffset is wrong. <UICollectionView: 0x7b7400061800; frame = (10 10; 300

nodejs

Node.js: Nodemailer "Please log in via your web browser and then try again" error when using Gmail

The problem While browsing our Node.js site logs we have noticed the following error: Please log in via your web browser and then try again. We use Nodemailer with our Gmail account to send emails. The solution Logging in to the Gmail account

ReactiveSwift: flatten and some of its strategies

import Result import ReactiveSwift import Foundation flatten The power of ReactiveSwift lies within its operators. Let's start with a simple example. You are working hard and almost ready to advance to the next level of Pokemon when your product manager appears out of nowhere.

swift

ReactiveSwift: Working with a playground

According to the documentation, to use ReactiveSwift.playground the following steps must be performed: Retrieve the project dependencies using one of the following terminal commands from the ReactiveSwift project root directory: git submodule update --init OR, if you have Carthage installed carthage checkout Open

ReactiveSwift

ReactiveSwift: A very important difference between a Signal and a SignalProducer

A Property in ReactiveSwift allows us to track its changes over time. A Property is thread-safe and observable. A MutableProperty is a Property that can also be changed. Frequently we will use the following pattern to expose only non-muttable property in the interface: interface

swift

A simple optimization for UICollectionView (or UITableView) updates

The problem: Collection view is highly optimized and works great out of the box. It is really hard to slow it down or to make scrolling sloppy when the number of items displayed is relatively small (~ a couple of hundreds). Even doing reloadData every

swift

Swift Compiler Error when using Generics and nested functions, Command failed due to signal: Segmentation fault: 11

The problem: The following code is causing a compiler crash when compiled with Swift 3 and Xcode 8: import Foundation public typealias IntCompletion = (Int) -> Void public typealias FetchIntBlock = (IntCompletion) -> Void class ATSwiftTest<T: NSURL>: NSObject { var fetchIntBlock: FetchIntBlock

Xcode

Creating NSManagedObject subclasses from a model in Xcode 8

The problem: In Xcode 8, it is no longer possible to create NSManagedObject subclasses by going to File menu and choosing New > File and then selecting NSManagedObject subclass from the iOS > Core Data section. That option simply does not exist. The solution:

swift

Catching an exception in Swift using functions!

Recently we had a need in a general way to catch calls that can throw an exception. Like with any functional or semi-functional language it is fairly easy to create weird looking constructs with Swift. Let's create one but first a function that simply

swift

Debugging "xxx was deallocated while key value observers were still registered with it"

Debugging errors that are a result of observers being added to an object and not removed from it can be hard because the error "xxx was deallocated while key value observers were still registered with it" does not tell us anything about

git

Update Git to respect a newly added .gitignore

Adding a .gitignore file to an existing project will prevent untracked files being added to the working tree but the files will still remain at the staging area (Git Index). But not all is lost and it is possible to remove the files we

mongoldb

Importing a Shapefile into MongoDB using GeoJSON

Majority of map-related data provided by government agencies is in the form of geospatial vector data stored in a semi-proprietary and complex format known as a Shapefile. Shapefiles are technology from the past when desktops ruled supreme. Nowadays, developers want a simpler way to

swift

VIPER architecture with Swift

Decouple - separate, disengage, or dissociate (something) from something else. Why do we need it? Decoupling makes our code easier to maintain because changing one part of the code will not cause issues with the rest of the code. It also simplifies code testing,

Xcode

Debugging view constraints with Xcode 7

Until a tiny barely noticeable button was added to the debug area of Xcode, it used to take a number of breakpoints and print statements to debug view constraints. Not anymore! A small button named "Debug view hierarchy," displays current view hierarchy

swift

Using guard to test for an empty string

The code to check and bail out if a string is NULL or empty most of the time looks something like that: if self.text == nil || self.text!.isEmpty { return } In Swift, we have a syntax candy called guard that executes statements based on

iOS

Stack views vertically or horizontally on iOS 8 using AutoLayout

While starting iOS 9 we have UIStackView, it is a little bit tricky to stack views vertically or horizontally on iOS 8 using AutoLayout and without using any helper views. For a horizontal arrangement the trick is to position the views and add "

Xcode

Positioning views relative to one another with auto-layout

Positioning views relative to one another with auto-layout was fairly tricky until, Adding Layout Constraints by Control-Dragging, was intruded in Xcode. Now, to make one view 10pt below another view, all we have to do is to ctrl-drag first view into the second view

Swift cheat sheet

let - readonly var println(“ \() “) ? - Optional (can be not set) enum Optional<T> { case None case Some(T) } ! - unwrap an optional (will crash if nil) all properties have to be initialized and optionals are nil by default getters and setters

nginx

Nginx location block and rewriting URLs

URI - the part of URL that comes after the domain (or IP/Port) name. http://curbsidr.com/guests/35/services/34/locations/33 /guests/35/services/34/locations/33 is the URI location block allows 4 optional modifiers and a string to match

nginx

Renewing GoDaddy SSL certificate on Nginx

locate ssl_certificate entry in the Nginx config file, for example: ssl_certificate /etc/ssl/secure/yoursite.com_chained.crt; locate ssl_certificate_key in the Nginx config file, for example: ssl_certificate_key /etc/ssl/secure/yoursite.com.key; you will not need

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