There are situations when we need to style a UILabel differently for each text. This can be done by using NSAttributedStrings. Thanks to the library OHAttributedLabel, you can achieve the styled NSAttributedStrings easily under one UILabel. In order to use the library, you must first import the CoreText Framework. In the example below, I style the label so that the text are splited into 2 different colors. OHAttributedLabel *label; NSString *txt = @"page (1 of [...]

ZXing is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. In this tutorial, Im going to show you how to make a small modification to the library so that the QRCode reader can read from image as well instead of just camera. First of all, download the ZXing-1.7.zip. After you unzipped it, look for the folder ‘iphone’ -> ‘Barcodes’, this is the sample project we will be [...]

Base on the explanation in Apple Developer Documentation, delegation is a simple and powerful pattern in which one object in a program acts on behalf of, or in coordination with, another object. The delegating object keeps a reference to the other object—the delegate—and at the appropriate time sends a message to it. The message informs the delegate of an event that the delegating object is about to handle or has just handled. The delegate may [...]

Ever thought of how to import your excel data into iphone project? You can do it with CSV parser. CHCSVParser is an Objective-C parser for CSV files. It is very useful if you would like to import your data from excel file, you can save your excel to CSV format and import them into objective-c. The source can be downloaded from github here. To use this library, in your controller, you need to import the [...]

Before ios 5, we have to use third party JSON library like SBJSON or TouchJson to deal with JSON data. Today, iOS 5 has built-in APIs in the Foundation Framework which is called the NSJSONSerialization to make it easy to read and write JSON. Click here for reference. Below is an example of how to read JSON data into NSArray, NSDictionary and NSString. NSString* str= @"{\"name\":\"cayden\",\"hobby\":[{\"0\":\"programming\"}, {\"1\":\"gym\"}]}"; NSData* data=[str dataUsingEncoding:NSASCIIStringEncoding];   NSError* error; NSDictionary* json [...]

In this post i’ll walkthrough how to implement the ios5 Twitter framework in your app. The first thing we need to do is of course import the new Twitter Framework and the Account Framework into our project. In Xcode, tap on the project, under ‘Build Phases’, add the two frameworks needed. To use the framework, we will import them into our controller like this: #import <Twitter/Twitter.h> #import <Accounts/Accounts.h> In this demo, i’ll just create a [...]