Category Archives: iOS

Solution for CoreData Multithreading problem.

By | May 1, 2016

This post is for people who are at least familiar with CoreData. But just knowing is not everything.. CoreData creates problems when you access them from different threads… Most common problems are listed below CoreData: error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. -[__NSCFSet… Read More »

Advantages of NSURLSession over NSURLConnection in iOS and Sample Demo Code

By | March 30, 2016

In an application we usually works with Data tasks – Data tasks are used for requesting data from a server, such as JSON data. These data are usually stored in memory and never touches the File System We can use NSURLSessionDataTask. Upload Tasks – Upload tasks are used to upload data to a remote destination. We can use… Read More »

Using “BackgroundFetch” in iOS to do task in the Background.

By | March 5, 2016

Hi Friends, Here is a simple way to do background task in iOS using “BackgroundFetch”. We will just try to send a message to the UI when a new data arrives in the background. You can do anything there you want. To enable “BackgroundFetch” in your app, you have to do some modifications in your project. Go to… Read More »

Contacts Demo in Swift 2 – Showing Contacts Picker, Load Contacts in Custom TableView, Add New Contact, Update Contact, Delete Contact, Search Contact

By | February 23, 2016

In Today’s post I will show you How to do below things in Swift 2… 1. Show Contact Picker using System In-Built UI & Pick a Contact 2. Load all Contacts in a TableView 3. Search a Contact 4. Add a New Contact 5. Update a Contact 6. Delete a Contact Before using the contacts we need to… Read More »

Missing iOS Distribution signing identity for … Xcode can request one for you/This Certificate has an Invalid Issuer – iOS Issue Solved

By | February 15, 2016

To Solve this 1. Download https://developer.apple.com/certificationauthority/AppleWWDRCA.cer 2. Double-click to install to Keychain. 3. Then in Keychain, Select View -> “Show Expired Certificates” in Keychain app. 4. It will list all the expired certifcates. 5. Delete “Apple Worldwide Developer Relations Certificate Authority certificates” from “login” tab 6. And also delete it from “System” tab. 7. Now Go to your… Read More »

Google Maps – iOS, Location tracking, Custom Markers, Multiple Markers StreetView, CameraView, IndoorView, Showing Route in Maps etc…

By | February 11, 2016

You know for using Google Maps,we need an API Key. You can check Google Maps for Android here… So for that we need to register in Google Developer Console.     Once you get your API Key. we can start with Integrating Google Maps in our app. I am going to show how we can integrate The Google… Read More »

Simple Core Data tutorial in iOS

By | July 7, 2015

In this tutorial we will be making a simple application to save a person details using Core Data. Here we will have two models or it can be said as Database tables – Model1 and Model2. Below are the basic things about Core Data… Core Data Stack The key objects of the stack are the 1. managed object… Read More »

Making a GridView in iOS using UICollectionView.

By | November 23, 2014

Hey all, In Today’s article you will study about the implementation of UICollectionView in iOS. It is similar to GridView in Android. First drag a UICollectionView [Not the Collection View Controller] in your interface and let it be there. we will come back to it later. We are going to create a UICollectionView with custom Cells. So for… Read More »

Download an image with ProgressBar in iOS

By | November 17, 2014

Hi all, Today I will show you how you can download an image showing complete progress. Make sure that you have an interface like the below image. You should link all the interface views with the corresponding variables in ViewController.h ViewController.h ViewController.m You can download the complete source code from here.

Creating a Custom Alert or PopUp in iOS

By | November 15, 2014

First we will write a class that extends UIView to create a Custom PopUp Create a Cocoa file and name it CustomPopUp You should get two files CustomPopUp.h and CustomPopUp.m CustomPopUp.h CustomPopUp.m I have a sample interface like this. Now the ViewController.m MAKE SURE YOU HOOK UP THE BUTTONS TO THEIR CORRESPONDING FUNCTIONS. You can download the complete… Read More »

Select an image from Gallery and show it in an ImageView in ios.

By | November 11, 2014

Hey all, This is a simple post showing how you can open the “Gallery” or “Photos” application in iOS. ViewController.m ViewController.m We add “UINavigationControllerDelegate,UIImagePickerControllerDelegate” to get the events after selecting the image from the Gallery. The below function is called after selecting image from Gallery – (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo You can download the complete… Read More »

Customizing UITableView using “Prototype Cells” in iOS.

By | November 3, 2014

Hi all, In today’s tutorial we will study how we can customize a UITableView using “Prototype Cells” in iOS which was introduced in XCode 5.0. First Create a new Project and Name it “CustomTBLView”. Now you will get the Main.storyBoard file with other ViewController and Delegate Files. Open Main.storyBoard and “Drag” a TableView on to it. Now Drag… Read More »

Handling Files in iOS

By | October 29, 2014

Hi All, In Todays article we will see how we can handle files in Objective C. The list of the methods used for accessing and manipulating files are listed below. Here you have to replace the FilePath1, FilePath2 and FilePath strings to our required full file paths to get the desired action. Comparing two file contents Check if… Read More »