Have you ever dreamed of your own custom activity indicator within your iPhone App? The class UIImageView provides a very useful and simple way to implement such a thing. The only thing you have to do is to:
- Provide a number of images that reflect your indicator animation.
- Create a new UIImageView instance and set images and animation duration.
- Position your custom activity indicator within your current view.
To demonstrate the whole process I quickly created some images (I am sure you will style them better than me) which will serve for our animation.
Continue reading ‘Create custom activity indicator for your iPhone App’
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:
Continue reading ‘UIImageView Fade-In and Fade-Out (pulsating) Animation’
NOTE: this is not a general solution and might not work on every phone or future version of the DKs, but it is still a great way for any prototyping purposes 
Unfortunately the SDK currently only supports a small set of the Bluetooth stack. As we wanted to integrate some of our hardware gadgets (over SPP/RFCOMM) with our Dev Phone 1, we needed to digg a little deeper. So here is what you want to do to get it working.
Continue reading ‘Android Bluetooth on steroids with the NDK and bluez’
So after the first few mini steps into the NDK the first thing you will probably notice missing, is a way to retrieve log messages through logcat. To be able to do this you need to do two things:
Continue reading ‘Android NDK logging’
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:
Continue reading ‘Check internet connection on iPhone’
Creating some UITableViewCells with a main label and a secondary detail label (as we allready knew from the e.g. settings menu on the iPhone) to show some kind of a selected value isn’t very complicated but annoying anyway. The ways to do that were either to create a label as subview programmatically or you used the Interface Builder to provide a nib file including the cell.
This common task was greatly facilitated by the introduction of the new iPhone SDK 3.0, which now supports a few styles for UITableViewCells (see UITableViewCellStyle for more information). The following example shows how to create such a simple table cell:
//create a cell with the style UITableViewCellStyleValue1
UITableViewCell *cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleValue1
reuseIdentifier:@"yourReuseIdentifier"];
//the main label will be shown on the left side
[cell.textLabel setText:@"mainLabel"];
//the detail label will be shown on the right side
//in blue color, right-aligned and in a smaller font size
[cell.detailTextLabel setText:@"detailLabel"];
The result of this will be something like that:
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.
Continue reading ‘Multiple UIBarButtonItems in UINavigationBar’