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
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
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
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
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
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
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
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
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) ->
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 >
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
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
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
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
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
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
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
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
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
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
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
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_
ubuntu Python pip IncompleteRead error after Ubuntu upgrade After upgrading ubuntu pip started throwing the following error: ImportError: cannot import name IncompleteRead It looks like the problem is caused by system installing old version of pip: remove pip sudo apt-get purge
android Adding an external library into Android Studio project We needed to add Volley networking library into our project and a quick search returned the following solution: dependencies { compile 'com.mcxiaoke.volley:library-aar:1.0.0' } While this is great and mcxiaoke.
