Tag Archives: iphone sdk
Easily Creating Charts on iOS using Google Image Charts URL API

Easily Creating Charts on iOS using Google Image Charts URL API

In search of the simplest way to put sophisticated charts/graphs into an iPhone app, I surveyed some possible options.  I wanted a non-interactive, freely available, graph that felt polished and native to iOS. This excluded UIWebView javascript options, commercial libraries, and the advanced open-source options. So I settled on Google Charts Image Charts.   Google Image […]

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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, […]

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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 […]

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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 […]

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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 […]

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