Tutorial by Examples: v

override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default.addObserver(self, selector: Selector(("batteryStateDidChange:")), name: NSNotification.Name.UIDeviceBatteryStateDidChange, object: nil) NotificationCenter.default.addObserver(self, selector: Selecto...

CloudFormer template translates the existing AWS entities to a generate new CloudFormation template to accelerate the time to recreate the environment. The CloudFormer launches in a default VPC which might not be suitable in the cases where the default VPC is deleted. This code base is fork from the...

See Swift 3 example for usage information and notes func pbkdf2SHA1Calibrate(password:String, salt:[UInt8], msec:Int) -> UInt32 { let actualRoundCount: UInt32 = CCCalibratePBKDF( CCPBKDFAlgorithm(kCCPBKDF2), password.utf8.count, salt.count, CCPseudoRandom...

Determine the number of PRF rounds to use for a specific delay on the current platform. Several parameters are defaulted to representative values that should not materially affect the round count. password Sample password. salt Sample salt. msec Targeted duration we want to achieve f...

The preserveAspectRatio attribute has an optional parameter: meet | slice. The default behavior is meet which stretches the content in both the x and y dimension until it fills either the width or height of the viewBox. The alternative - slice preserves the aspect ratio of the content but scales up ...

What happens when we execute python -m SimpleHTTPServer 9000? To answer this question we should understand the construct of SimpleHTTPServer (https://hg.python.org/cpython/file/2.7/Lib/SimpleHTTPServer.py) and BaseHTTPServer(https://hg.python.org/cpython/file/2.7/Lib/BaseHTTPServer.py). Firstly, P...

// Default UINavigationBar appearance throughout the app [[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor], NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-CondensedBold...

Keychain.h #import <Foundation/Foundation.h> typedef void (^KeychainOperationBlock)(BOOL successfulOperation, NSData *data, OSStatus status); @interface Keychain : NSObject -(id) initWithService:(NSString *) service_ withGroup:(NSString*)group_; -(void)insertKey:(NSString *)key with...

Three basic tools. nginx - free, open-source, high-performance HTTP server and reverse proxy, with high performance; gunicorn - 'Green Unicorn' is a Python WSGI HTTP Server for UNIX (needed to manage your server); supervisor - a client/server system that allows its users to monitor and control ...

Cordova plugins are in simple words a layer on top of the respective native platform. Plugins provide an interface between to access the native platform.

Cordova Plugins provide a common interface to interact with the native code. Each plugin has an intermediary JavaScript file that provides access to platform specific features.

cordova plugin add <plugin-name> Example: cordova plugin add cordova-plugin-camera The plugin should be installed in the root directory of the project. Note: Before adding the plugin replace the platform specific www folder content with the outer www folder in the root directory. Th...

You can set a variable to something with the eval() function by using something similar to the below code: var x = 10; var y = 20; var a = eval("x * y") + "<br>"; var b = eval("2 + 2") + "<br>"; var c = eval("x + 17") + "<br&...

This example implements a custom binding that toggles visibility (similar to the existing visible binding), but will utilize jQuery's fading API to animate the transition from visible to invisible. Custom binding definition: //Add a custom binding called "fadeVisible" by adding it as a p...

DIVIDE a INTO b c d Data item b, c, and d are changed as b/a, c/a and d/a. DIVIDE a INTO b GIVING c Data item c is changed as b/a. DIVIDE a BY b GIVING c Data item c is changed as a/b. DIVIDE a INTO b GIVING q REMAINDER r Data items q and r are set with results of b/a DIVIDE a BY b G...

EVALUATE a ALSO b ALSO TRUE WHEN 1 ALSO 1 THRU 9 ALSO c EQUAL 1 PERFORM all-life WHEN 2 ALSO 1 THRU 9 ALSO c EQUAL 2 PERFORM life WHEN 3 THRU 9 ALSO 1 ALSO c EQUAL 9 PERFORM disability WHEN OTHER PERFORM invalid END-EVALUATE

Create a script to start celery worker. Insert your script within your app. For example: stack/bin/celery_worker_start #!/bin/bash NAME="StackOverflow Project - celery_worker_start" PROJECT_DIR=/home/stackoverflow/apps/proj/proj/ ENV_DIR=/home/stackoverflow/apps/proj/env/...

Given an interface: public interface Logger { void log(String message); } Rather than usage: public void doJob(Logger logger) { if (logger != null) { logger.log("[doJob]:Step 1"); } // ... if (logger != null) { logger.log("[doJob]:Step 2&q...

By definition: Services are basically constructor functions. They use ‘this’ keyword. Factories are simple functions hence return an object. Under the hood: Factories internally calls provider function. Services internally calls Factory function. Debate: Factories can run code before we retur...

Latest Cordova version: Cordova 6.1.0 - https://cordova.apache.org/news/2016/03/23/tools-release.html Cordova 6.0.0 - https://cordova.apache.org/news/2016/01/28/tools-release.html Latest Android platform and iOS plaatform Cordova Android 5.2.2 - https://cordova.apache.org/announcements/2...