Luke Tupper Consulting

Doing Big Text in UITableView

Luke Tupper — Tue, 07 Sep 2010 07:47:59 +0000

If you need to display differing size text in a UITableView here is some sample code that uses standard UITableViewCells and changes the height depending on the size of the Table View (handles rotation ok).

The main sections of code is the heightForRowAtIndexPath:
NSString *bigText = [self.bigTexts objectAtIndex:indexPath.row]; CGSize textSize = [bigText sizeWithFont:self.labelFont constrainedToSize:CGSizeMake(tableView.frame.size.width - 40.0, MAXFLOAT) //40 should be the margin needed for controls etc. lineBreakMode:UILineBreakModeWordWrap]; return textSize.height;

And the initialisation of the TableViewCell:
static NSString *CellIdentifier = @"Cell";


    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    }
	// Configure the cell.

	cell.textLabel.numberOfLines = 0;

	cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;

	cell.textLabel.text = (NSString *)[self.bigTexts objectAtIndex:indexPath.row];

	cell.textLabel.font = self.labelFont;

return cell;

I have uploaded the complete project for those who want to run it straight out of the box.

Searching for files with content via Linux Command line

Luke Tupper — Tue, 29 Jun 2010 04:04:11 +0000

I needed to search for files with a common bit of content on a host that I had connected to ssh.

This example searches all php files for ‘Search Term’, it search every sub directory from the current directory and prints out the name:

find . -name "*.php" -exec grep -l "Search Term" {} \;

Simple iPhone Table Example

Luke Tupper — Sun, 19 Jul 2009 11:26:07 +0000

Unless you are building a custom UI (like a game) on the iPhone you probably spend a lot of time working with UITableVews.

I often found it difficult to find good simple examples of iPhone TableView code.

This first sample shows three different uses of UITableView:

1) Very basic table
2) Table that can be resorted.
3) Table that can be resorted with the first and last rows locked in place.

Click on the plain/grouped segment control to choose which style of table you want.

Table Sample

Cocoa Quick Tip: Insert/Delete Icons not displaying on Table

Luke Tupper — Tue, 07 Jul 2009 14:16:37 +0000

Had a bit of an issue that took me a bit of head scratching. I had a UITableView which worked perfectly in iPhone API 2.2 but in 3.0 the insert/delete icons weren’t being displayed. Reworked and checked all the code but nothing worked.

It seems if you set the editing flag to YES when creating the tableViewCell’s, the insert/delete icon applied by the table delegate (editingStyleForRowAtIndexPath) isn’t displayed. Removing the call to cell.editing seems to fix the problem. This seems to be one of those things that is slightly different between iPhone OS 2.2 and 3.0.

iPhone 3.0 UIButton in a UITableViewCell Weirdness

Luke Tupper — Thu, 25 Jun 2009 10:09:08 +0000

I had a UIButton inside a UITableViewCell and these were being rendered with a black background once I had upgraded the project to iPhone OS 3.0. These table cells were being loaded from their own NIB file.

To stop the black background I needed to set the background of the TableViewCell to white (like you do on most cells after the upgrade), but for the button I also needed to set the UIButton to have the “Clear Context Before Drawing” setting checked.

The background should still be transparent to allow the corners of grouped tables to be shown.

Strange Cocoa Unit Testing Error

Luke Tupper — Wed, 14 Jan 2009 20:06:20 +0000

I was receiving the following error while trying to run my unit tests from XCode:

Test Host –path to app– exited abnormally with code 138

For whatever reason, removing the tests from the Unit Tests target and re adding them to the target made the error go away. No other changes necessary.

Adding unit tests to XCode 3 Project

Luke Tupper — Wed, 31 Dec 2008 05:01:48 +0000

Here is the article that explains how to add unit testing to XCode 3 project.

http://developer.apple.com/mac/articles/tools/unittestingwithxcode3.html

If you search for unit testing with XCode you will find a lot of older articles pointing to XCode 2.x and how to install etc, etc. Now XCode 3 includes unit testing out of the box, so it is a lot simpler.

decodeRetainedObject error when using Distributed Objects (DO)

Luke Tupper — Sun, 28 Dec 2008 23:39:12 +0000

Came across an interesting problem. Trying to get distributed objects to pass a common class between processes.

To avoid versioning issues I had the class in a shared location so that both client and server could use it.

On the server I was seeing a decodeRetainedObject: class ‘bleh’ not loaded error in the console log. Took a while to figure out, but XCode doesn’t automatically assign a class that are dragged and dropped into a project to the main target. The files simply needed to be assigned to the requisite target and everything works fine.

Cocoaheads Sparkle Screencast

Luke Tupper — Wed, 24 Sep 2008 07:59:38 +0000

Recently I did a presentation at the Melbourne Cocoahead, and recorded the screencast.

Here is the first part, a 24 minute demonstration of adding sparkle to a cocoa application.

The next 2 parts will hopefully be added in the next couple of weeks.

Code Coverage in XCode

Luke Tupper — Wed, 29 Aug 2007 13:15:14 +0000

While working with the latest version of Duplicate Image Detector I was hoping to see the amount of code coverage in the unit tests.

I was happy to see that the code coverage tools are built into GCC, but disappointed to see that it isn’t the easiest to meaniful statistics added to part of the build process. There is a great post at SuperMegaUltraGroovy.Com listing how to get code coverage enabled for your unit tests.

The one step I couldn’t complete is the code that needs to be inserted into the the Run Script after your test case run code. The code was a bit managled by Safari/Wordpress and even sorting that out I still had some issues.

Well after a bit of hacking around I found this code works pretty well (you will need to edit the framework name):

# Run the unit tests in this test bundle. "${SYSTEM_DEVELOPER_DIR}/Tools/RunUnitTests" # Run gcov on the framework getting tested if [ "${CONFIGURATION}" = 'Test' ]; then FRAMEWORK_NAME=DID-V2.0 FRAMEWORK_OBJ_DIR=${OBJROOT}/${FRAMEWORK_NAME}.build/${CONFIGURATION}/${FRAMEWORK_NAME}.build/Objects-normal/${NATIVE_ARCH} mkdir -p coverage pushd coverage echo ${OBJROOT} echo ${FRAMEWORK_OBJ_DIR} find ${FRAMEWORK_OBJ_DIR} -name *.o -exec gcov -b -o ${FRAMEWORK_OBJ_DIR} {} \; popd fi

This will produce the following information after the unit tests when you run your test:

File '/Users/tupps/Development/LTConsult/svn/DID/v2/ImageMatchManagement.m' Lines executed:70.00% of 40 Branches executed:100.00% of 34 Taken at least once:64.71% of 34 Calls executed:86.21% of 29 /Users/tupps/Development/LTConsult/svn/DID/v2/ImageMatchManagement.m:creating 'ImageMatchManagement.m.gcov'

I hope this helps get a few people closer to running unit tests and looking at their code coverage on the mac. A nice utility like shark would be fantastic for working through these files and all of the information that is exported.
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