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Articles by karthikeya Boyini
Page 99 of 142
How to handle right-to-left and left-to-right swipe gestures on iOS App?
To handle gestures in iOS application we’ll create an application with swift and see with help of an example. This can be done in two ways, with storyboard or programmatically.Method 1 − With storyboardFirst we’ll drag a swipe gesture recognizer from our object library and drop it in our View controller in which we want to add the swipe gesture.Then click on the gesture, press control and drag in your view controller class to create its connection.Make sure the sender of that action is UISwipeGestureRecognizer and the action looks something like this:@IBAction func swipeMade(_ sender: UISwipeGestureRecognizer) { }Now the swipe ...
Read MoreHow to extract the last 4 characters from NSString?
To extract last 4 characters from a string in swift we can use the internal functions of String class in swift.With new release every time methods have been modified, deprecated, added and improved in swift. Swift provides different methods to achieve the same. Let’s see these ways of doing it with a few examples.Method 1 − SubstringsIn swift three we were allowed to use a method called substring in which we could pass the string, it’s last index and the offset from which we wanted to trim the string.Let’s see an example of the same:var Str1 = "12312$$33@" print(Str1.substring(from:Str1.index(Str1.endIndex, offsetBy: ...
Read MoreHow to access RESTFul services from iOS/iPhone?
To access REST APIs in swift we need to go through a series of steps using the native way of networking in swift, that is using URL sessions and Data Tasks.Rest stands for Representational State Transfer, which defines some set of constraints that are to be used by web services. In swift, we can access web services in the following way.First of all, we need to create a session object, which default configuration.let configuration = URLSessionConfiguration.default let session = URLSession(configuration: configuration)Then we need to create an URL Request of The type we need, it can get, post, delete or put. ...
Read MoreHow to remove duplications from arraylist for listview in Android?
This example demonstrate about How to remove duplications from arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on refresh button to get the changes of listview.Step 3 − Add ...
Read MoreHow to insert element to arraylist for listview in Android?
This example demonstrate about How to insert element to arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on refresh button to get the changes of listview.Step 3 − Add ...
Read MoreHow to delete all elements from arraylist for listview in Android?
This example demonstrate about How to delete all elements from arraylist for listview in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken name as Edit text, when user click on save button it will store the data into arraylist. Click on delete ...
Read MorePage Rank Algorithm and Implementation using Python
The PageRank algorithm is applicable in web pages. Web page is a directed graph, we know that the two components of Directed graphsare -nodes and connections. The pages are nodes and hyperlinks are the connections, the connection between two nodes.We can find out the importance of each page by the PageRank and it is accurate. The value of the PageRank is the probability will be between 0 and 1.The PageRank value of individual node in a graph depends on the PageRank value of all the nodes which connect to it and those nodes are cyclically connected to the nodes whose ...
Read MoreAdding a column that doesn't exist in a query?
Add a column that does not exist in a query, with the help of AS keyword. The syntax is as follows −SELECT yourColumnName1, yourColumnName2, ....N, yourValue AS yourColumnName, ....N' FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table ColumnDoesNotExists -> ( -> UserId int, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.67 sec)ExampleInsert some records in the table using insert command. The query is as follows −mysql> insert into ColumnDoesNotExists(UserId, UserName) values(100, 'Larry'); Query OK, ...
Read MoreCheck if a table is empty or not in MySQL using EXISTS
The following is the syntax to check whether a table is empty or not using MySQL EXISTS −SELECT EXISTS(SELECT 1 FROM yourTableName);ExampleFirst, let us create a table. The query to create a table is as follows −mysql> create table ReturnDemo -> ( -> Id int, -> Name varchar(10) -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ReturnDemo values(100, 'Larry'); Query OK, 1 row affected (0.18 sec) mysql> insert into ReturnDemo values(101, 'Bob'); Query OK, 1 row affected (0.28 sec) ...
Read MorePython program to check if a string is palindrome or not
Given a string, our task is to check weather this string is palindrome or not.AlgorithmStep1: Enter string as an input. Step2: Using string slicing we reverse the string and compare it back to the original string. Step3: Then display the result.Example codemy_string=input("Enter string:") if(my_string==my_string[::-1]): print("The string is a palindrome") else: print("The string isn't a palindrome")OutputEnter string:madam The string is a palindrome Enter string:python The string isn't a palindrome
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