Tutorial by Examples: ch

Background fetch is a new mode that lets your app appear always up-to-date with the latest information while minimizing the impact on battery. You could download feeds within fixed time intervals with this capability. To get started: 1- Check Background Fetch in capabilities screen in Xcode. 2- I...

1- Run the app on a real device and attach it to Xcode debugger. 2- From Debug menu, select Simulate Background Fetch: 3- Now Xcode will pause the app with SIGSTOP signal. Just tap the continue button to let the app do the background fetch. Now you will see that data is fetched and ready for ...

Like page caching, action caching caches the whole page. The difference is that the request hits the Rails stack so before filters are run before the cache is served. It's extracted from Rails to actionpack-action_caching gem. A common example is caching of an action that requires authentication: ...

Code <p><?php echo esc_html( sprintf( __( 'Character set: %s', 'textdomain' ), get_option( 'blog_charset' ) ) ); ?></p> Output Character set: UTF-8

For sections, instead of utilizing one big JSON file (like settings_schema.json, they instead keep their schema within the file of the section that is using it. To do this {% schema %} {% endschema %} tags are used and JSON is placed between them. From there, the format is similar to settings_schema...

Abstract Class : package base; /* Abstract classes cannot be instantiated, but they can be subclassed */ public abstract class ClsVirusScanner { //With One Abstract method public abstract void fnStartScan(); protected void fnCheckForUpdateVersion(){ System....

Before you can build anything, you are required to make your machine ready for building. For this you need to install a lot of libraries and modules. The most recommended Linux distribution is Ubuntu, so this example will focus on installing everything that is needed on Ubuntu. Installing Java Fir...

Use dynamic_cast for converting pointers/references within an inheritance hierarchy. Use static_cast for ordinary type conversions. Use reinterpret_cast for low-level reinterpreting of bit patterns. Use with extreme caution. Use const_cast for casting away const/volatile. Avoid this unless you ar...

&& chains two commands. The second one runs only if the first one exits with success. || chains two commands. But second one runs only if first one exits with failure. [ a = b ] && echo "yes" || echo "no" # if you want to run more commands within a logical c...

A semicolon separates just two commands. echo "i am first" ; echo "i am second" ; echo " i am third"

The | takes the output of the left command and pipes it as input the right command. Mind, that this is done in a subshell. Hence you cannot set values of vars of the calling process wihtin a pipe. find . -type f -a -iname '*.mp3' | \ while read filename; do mute --noise &quot...

With a simple for loop, all zip archives in a directory can be extracted. for (i in dir(pattern=".zip$")) unzip(i) The dir function produces a character vector of the names of the files in a directory matching the regex pattern specified by pattern. This vector is looped through w...

In this example, we use this database: "your-project-name" : { "users" : { "randomUserId1" : { "display-name" : "John Doe", "gender" : "male" } "randomUserId2" :...

Note: You need to know which data referenced by getReference() first before you can completely understand this example. There are three common method to get your data from Firebase Realtime Database: addValueEventListener() addListenerForSingleValueEvent() addChildEventListener() When w...

There may be multiple reason why you want to create a text file in batch. But whatever the reason may be, this is how you do it. If you want to overwrite an existing text file use >. Example: @echo off echo info to save > text.txt But if you want to append text to an already existing t...

You may want to copy files from one place to another. In this example we'll teach you. You can use the command xcopy. The syntax is xcopy c:\From C:\To Example: @echo off xcopy C:\Folder\text.txt C:\User\Username\Desktop There are also switches you can use. If you want to view them open up co...

Mage::helper('catalog/image')->init($item->getProduct(), 'thumbnail'); Mage::helper('catalog/image')->init($item->getProduct(), 'small_image'); Mage::helper('catalog/image')->init($item->getProduct(), 'image');

Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getThumbnail()); //Thumbnail Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getSmallImage()); //Small Image Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getImage(...

$isSecure = Mage::app()->getStore()->isCurrentlySecure(); This will return true if the current url is secure.

Suppose we want to write a constraint which matches a number, but approximatively. Say, you are supposed to have 95 people in a survey, but 93 or 96 will do as well. We can write a custom constraint of the form: public class AlmostEqualToConstraint : Constraint { readonly int _expected; ...