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Page 1662 of 2109
How to hide the keyboard in Swift by pressing the return key?
In this article, you will learn about how you can hide the keyboard while editing text in the UITextField. In this example, you will hide the keyboard by pressing the return button on the keyboard. In the Swift language, UITextField class provides us with some delegate methods. They called on different actions or events. We will implement one of the delegate methods to hide the keyboard. Also, you will see how to change the return type if required. In this example, we will hide the keyboard in UITextField to enter an email address by following the below steps − ...
Read MoreHow to change the font of UIButton with Swift?
In Swift, this is very easy to change the font of a button. You can use the titleLabel property of the button which is of type UILabel class. This property provides another property called font to apply the desired font. Let’s see some examples of changing the font. We will follow the below steps to change the font of a button − Step 1 − Initially, we will do the basic setup with button creation and customization. Step 2 − In this step, we will change the system font with size and weight. Step 3 − In this ...
Read MoreGolang program to implement binary tree data structure
In the Go, a binary tree is a tree data structure where each node has at most two children, as the left child and the right child. Go's built-in data structures and operations, like structs and pointers, can be used to create a binary tree. The tree's nodes can be visualized as structs with fields for the value kept at each node and pointers to any left or right children. There are three types of tree traversals- preorder, inorder and postorder. We will use two methods to implement the binary tree data structure. In the first method we executed pre-order ...
Read MoreTurn a Queue into Priority Queue
Introduction A queue is a linear data structure that follows the FIFO principle for inserting and removing elements and has no close ending. It is functional on both ends. In this tutorial, we will learn how to turn a queue into a priority Queue and understand the meaning of queue and priority queue in the data structure. What is Queue? Queue in data structure resembles the queue in real life and is used to handle multiple data. It is an ordered list in which elements are entered on the rear end and removed from the front end. In this, the ...
Read MoreGolang program to read and print all files from zip file
Golang has packages like os, io, and Archie/zip that can be used to read and print all the files from a zipped file. A zip file is a compressed collection of a set of files/folders. The OS package is used for performing copy operations, the io pacakge is for reading and writing operations whereas the archive/zip package is for unzipping and zipping the file. In this article, we are going to learn about using all these packages to perform the copy and unzipping of the files and printing the same. Method 1: Using io and os package This program uses ...
Read MoreGolang program to get all files present in a directory
Golang has OS package such as OS.open(), os.closs(), os.copy() and move more that are used for performing different operations with the external files. Similiary we have io package in golang that is used for performing read and write operations on the external file. Here in this article, we are going to use these two packages to print all the files in the given directory. Method 1: Using OS Package This program opens the provided directory and reads its contents using the os package. A slice of os.FileInfo objects, which are returned by the Readdir function and include details about each ...
Read MoreGolang program to append a string in an existing file
In Golang, we can use io and os packages to append a string in an existing file. file contains data that can be manipulated in many ways like editing and writing the data. In this article the first method will demonstrate the application of os.Open file of OS package. In the second method, we are going to demonstrate the application of io package. Method 1: Using OS Package In this method, we are going to use os.OpenFile function of OS package in Golang. The permissions for the file are specified by the 0644 parameters. The file will be created ...
Read MoreGolang program to get the file extension
In golang, we can use the path package and string package to get the extension of a particular file. Here, in his article, we will obtain the file extension using two methods. In the first method, we will use path package function path.Ext. In the second method, we will use strings package function strings.LastIndex. Method 1: Using Path Package In this method, we will use path.Ext from path package to get the file extension. This built-in function will take the file as an input whose extension is to be printed. Syntax path.Ext The Go path/filepath package makes it easier ...
Read MoreGolang program to get the relative path from two absolute paths
To get the relative path from two absolute paths in golang, we use filepath and string packages. Relative paths tell the location of file with respect to present working directory whereas absolute paths tell the location of file starting from root directory. In the first method we will use filepath package functions and in the second method we will use strings package function. Method 1: Using Filepath Package In this program, the base name of the file, which is the file name without the directory path, is extracted using the filepath.Base function from the path/filepath package. The name of the ...
Read MoreGolang program to get the name of the file from the absolute path
We are going to use the filepath and string functions of golang to get the file name from the absolute path. An absolute directory begins with the root directory and includes all intermediate directories. In the first method, we will use filepath package functions and in the second example, we will use strings package functions. Method 1: Using filepath Package The base name of the file, which is the file name without the directory path, is extracted in this program using the filepath.Base function from the path/filepath package. The name of the extracted file is then displayed on the console. ...
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