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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to get the distance between two geographic locations in iOS using Swift?
In this post we will learn how to calculate the distance between two geo locations.We will show the distance between two points on a label.To do so follow the steps belowStep 1 − Open Xcode → New Project → Single View Application → Let’s name it “FindDistance”Step 2 − Open Main.storyboard and add two labels as shown below.Step 3 − Attach one @IBOutlet for the bottom label. Name it distanceLabelStep 4 − Import CoreLocation framework in ViewControllerStep 5 − Add two points between which we want to find the distance as variablesvar firsLocation = CLLocation(latitude:34.54545, longitude:56.64646) var secondLocation = CLLocation(latitude: ...
Read MoreHow to programmatically prevent scrolling in WebView of iOS?
Disabling scrolling in WebView in iOS is very simple.The ‘scrollView’ property of the WebView is exposed by iOS.You will just need to disable the scrolling of the corresponding scrollView using below code.webView.scrollView.isScrollEnabled = falseThe above code will disable the scrolling on WebView.If you were just looking to disable scrolling in web view above code would do that. If you want to know from scratch how to load WebView and disable scrolling. Follow along.Let’s create a sample project in XCode and learn the WebView loadingStep 1 − Open Xcode → New Project → Single View Application → Let’s name it “WebViewScrollDisabling”Step ...
Read MoreHow to check if a text field is empty or not in swift?
It’s very easy to check whether text field is empty or not in Swift.You will first need to check whether text is available or not in text field i.e. it’s not nil, then you will need to check if its present then its empty or not. Assuming myTextField is your text field variable name, you can do the followingif let text = myTextField.text, text.isEmpty { // myTextField is not empty here } else { // myTextField is Empty }Above code will check if textField is empty or not.If you want to look at how the text field can ...
Read MoreHow to add a border to the top and bottom of an iOS View?
In this post we will learn how to add top and bottom border to view.In this example we will take as sample view and add borders to it.Step 1 − Open Xcode → New Project → Single View Application → Let’s name it “AddBorderTopAndBottom”Step 2 − Open Main.storyboard add a UIView to it as shown below.Step 3 − Add one @IBOutlet for the view, name it centerView.Step 4 − We will write separate method to add borders to this view. To add borders to this view we will create two layers with desired thickness. We will set the frame of ...
Read MoreHow do you animate the change of background color of a view on iOS?
In this post we will learn how to change the background color of view with animation.In this example we will change background color of view on click of a button. On clicking the button the background color will change to red, then on next click it would change to blue, on next click to red again.Step 1 − Open Xcode → New Project → Single View Application → Let’s name it “ChangeBGColor”Step 2 − Open Main.storyboard add a button as shown belowStep 3 − Add one @IBAction for touchUpInside of ‘Change Background’ button. Name the function as changeBackgroundClicked.Step 4 − ...
Read MoreHow to read data from one file and print to another file in Java?
Java provides I/O Streams to read and write data where a Stream represents an input source or an output destination which could be a file, i/o devise, other programs, etc.In general, a Stream will be an input stream or, an output stream.InputStream − This is used to read data from a source.OutputStream − This is used to write data to a destination.Based on the data they handle there are two types of streams −Byte Streams − These handle data in bytes (8 bits) i.e., the byte stream classes read/write data of 8 bits. Using these you can store characters, videos, ...
Read MoreCan we use readUTF() to read a string from a .txt file in Java?
The readUTF() method of the java.io.DataOutputStream reads data that is in modified UTF-8 encoding, into a String and returns it.ExampleThe following Java program reads a UTF-8 text from a .txt file using the readUTF() method.import java.io.DataInputStream; import java.io.EOFException; import java.io.FileInputStream; import java.io.IOException; public class UTF8Example { public static void main(String args[]) { StringBuffer buffer = new StringBuffer(); try { //Instantiating the FileInputStream class FileInputStream fileIn = new FileInputStream("D:\test.txt"); //Instantiating the DataInputStream class DataInputStream inputStream = new DataInputStream(fileIn); ...
Read MoreReading UTF8 data from a file using Java
In general, data is stored in a computer in the form of bits (1 or, 0). There are various coding schemes available specifying the set of bytes represented by each character.Unicode (UTF) − Stands for Unicode Translation Format. It is developed by The Unicode Consortium. if you want to create documents that use characters from multiple character sets, you will be able to do so using the single Unicode character encodings. It provides 3 types of encodings.UTF-8 − It comes in 8-bit units (bytes), a character in UTF8 can be from 1 to 4 bytes long, making UTF8 variable width.UTF-16 ...
Read MoreCan 'false' match some string in MySQL?
Yes, you can use false as 0 to match.Let us first create a table −mysql> create table DemoTable804 ( Id varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable804 values('101John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable804 values('Carol1002'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable804 values('1000'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable804 values('1010Bob'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable804;This ...
Read MoreSet DEFAULT values for columns while creating a table in MySQL
To set default values for columns while creating a table, DEFAULT. Let us first see an example and create a table. As you can see below, while creating the table, we have set DEFAULT −mysql> create table DemoTable803 ( UserId int DEFAULT 101, UserName varchar(100) DEFAULT 'Chris' ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command. For the values we are not inserting, the default values will get set automatically −mysql> insert into DemoTable803 values(102, 'Chris'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable803(UserName) ...
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