Tag Archives: objective-c
A survey of chart plotting possibilities for the precocious programmer using IOS

A survey of chart plotting possibilities for the precocious programmer using IOS

Adding charts to an iOS application leads one to a review of the currently available charting libraries for Objective-C/Cocoa.  Here is a quite likely, non-exhaustive list I’ve come up with to-date: Native Open-Source iOS Charting Libraries Core Plot  – the most comprehensive and popular(?) of the freely available charts. Too complicated for my application requirements, […]

Comments ( 0 )
Exchange rates from the ECB using XML for Objective-c

Retrieving live exchange rates from ECB XML feed for iOS

While building the Amazon Associates application I needed to access current exchange rates for a number of different currencies.  I looked for various sources for the data found the ECB and Bank of Canada both offer XML exchange rate feeds. http://www.bankofcanada.ca/rates/exchange/rates-in-rss/ http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml The ECB one was chosen because it’s much reduced data feed was all […]

Comments ( 0 )
Multiple images lazy-loaded on background threads

Lazy load multiple images on background threads on the iPhone

Purpose: This is a follow-on post in response to a question about the previous post. This entry expands on that post by explaining how to get the iPhone to load multiple images on a background thread (e.g. lazy loading), and updating the main thread with the images once they are retrieved – simple lazy-loading (for […]

Comments ( 2 )
Flow of background image loading

Retrieving remote images on background threads on the iPhone

Purpose: Explain how to get the iPhone to show an activity indicator while loading a remote image in a background thread, and updating the main thread with the image once it’s retrieved – simple lazy-loading. SDK Version: 4.2 (although should work on 3+) Frameworks: Standard view-based SDK libraries: UIKit, Foundation, CoreGraphics Tested on: Simulator/iPhone 4 […]

Comments ( 2 )