Tag Archive for 'iPhone OS'

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UIImageView Fade-In and Fade-Out (pulsating) Animation

Published on September 1, 2009 by Andreas in I talk code and iPhone OS. 0 Comments Tags: , , , .

Today just a small code snippet to create a nice fade-in-fade-out (or call it pulsating) effect on a given UIImage. To accomplish this within a UIView you have to do only a few steps:

  • Create a UIImageView containing your image.
  • Create the animation with its properties.
  • Set the animation for the specific layer containing your image.

In words of code you will have to do something like the following:

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Check internet connection on iPhone

Published on July 30, 2009 by Andreas in I talk code and iPhone OS. 1 Comment Tags: , .

People (especially iPhone developers) watch out! If your iPhone app relies on any kind of internet back-end-service, don’t forget to check if the service is available and even more to check if a internet connection is currently possible (for instance there is no network or the iPhone is in flight mode).

If you don’t provide enough information to your users, that your iPhone app needs a valid internet connection or your back-end-service is currently not available, Apple may reject your iPhone App.

You will find several examples how to achieve that at the web. The following code I found several times at stackoverflow.com could be very useful for you:

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UIButton in UITableView Footer

Published on July 4, 2009 by Andreas in I talk code and iPhone OS. 13 Comments Tags: , , , , , .

Once upon a time, there was a pretty UITableView within my iPhone user interface. This table included some UITableViewCells which were used to provide some information of a specific data record. At this time I thought that it would be nice to have a big red delete button at the end of the table (like we can locate it in the edit mask of the Apple Calendar App).

To realize such a button at the end of the table we can simply use the ability to define our own footer view for each section within a UITableView. The next steps describe how we can do that for a single section.

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Multiple UIBarButtonItems in UINavigationBar

Published on June 29, 2009 by Andreas in I talk code and iPhone OS. 7 Comments Tags: , , , .

Ever wondered how to place more than one button into a navigation bar in your app? I know it doesn’t look neat at all! The class UIBarButtonItem allows us to initialize a new instance with a custom view. This instance can be used as a kind of a toolbar and you can put as much buttons as you like in there. The toolbar again can be used for the rigthtBarButtonItem or leftBarButtonItem. Please remember:

  • Keep your interface clean and simple and
  • Be consistent with the iPhone Human Interface Guideline

For those guys, who still demand on more than one button on the left or right side of a navigation bar, the following code snippet could be useful.

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