Ever wondered how Xcode can symbolicate crash reports without you telling it the appropriate dSYM file? Xcode uses Spotlight to find the dSYMs on your system by adding a special attribute to the dSYMs Spotlight metadata. So with this CLI command you can find out where Xcode is (and isn’t) looking for the dSYM files:
$ mdfind 'com_apple_xcode_dsym_uuids = *'
Tabs… Don’t you hate tabs? I mean, the idea is nice, saving bytes and stuff. But the world isn’t ready for them yet.
Here’s our Xcode indentation settings:
And here are two lines of shell script that will help you clean up your already messed up code base 
find ./ -iname '*.[hcm]' -type f -exec gsed -i 's/\t/ /g' {} \;
find ./ -iname '*.[hcm]' -type f -exec gsed -i '/^[ \t]*$/! { s/[ \t]*$//g }' {} \;
What they’ll do is, 1st of all replacing all existing tabs by four spaces. The second command takes care of trailing whitespace (but not in lines that only contain whitespace), because we also hate that! 
All that require the GNU version of sed. OSX ships with the BSD version, so you need to install it via
brew install gnu-sed
Ever wanted to add a different view north of your table view without making it the tableHeaderView?
Here’s what you need:
@property (nonatomic, retain) UITableView *internalTableView;
- (void)loadView;
{
[super loadView];
self.internalTableView = self.tableView;
self.view = [[[UIView alloc] initWithFrame:self.view.frame] autorelease];
[self.view addSubview:self.tableView];
self.tableView.frame = self.view.bounds;
}
- (void)viewDidUnload;
{
self.internalTableView = nil;
[super viewDidUnload];
}
- (void)dealloc;
{
internalTableView = nil;
[super dealloc];
}
// here's the finesse
- (UITableView *)tableView;
{
if (!self.internalTableView) {
return [super tableView];
}
return self.internalTableView;
}
OK, what’s the syntax of this blog? The “UIViewController” thing was supposed to have protocols for UITableViewDataSource, UITableViewDelegate and UIScrollViewDelegat but the site did eat the stuff in between the brackets. Is this BBCode or something?
@Jörg: Comments are not yet optimized for code, sorry.
About implementing the UITableViewController functionality yourself: We went down that road & ended up in problems with keyboard support & contentInset in table views. Keeping as much functionality of the original UITableViewController never caused us any trouble.
Surprises me, I’m using both, too, no trouble. There’s also nothing really you need to implement yourself, only the delegate protocols but that’s what you have to do for a TableView anyway.
The important part is to also support the UIScrollViewDelegate protocol for keyboards and insets but that’s also the same with UITableViewController, I believe (not sure).
I don’t remember when exactly it happens but there are cases where with a TableViewController the TableView will be resized to fill the whole container again and hide/clutter your top view. Probablyrelated to rotations or Navigation controllers.
This is something I can never remember, so why not create a small post about it.
git tag -d v1.2.3 git push origin :refs/tags/v1.2.3
So what’s this… The first line is quite obviously deleting the tag from the local working tree. The second line deletes the tag from origin in the same way as you would delete a branch on origin, by pushing noting to it’s destination.
To be complete here’s how you would delete a remote branch from origin:
git push origin :my-branch
Since I Xcode 4.3 the opendiff terminal command didn’t work any longer.
Here’s how I fixed it:
sudo /usr/bin/xcode-select -switch /Applications/Xcode.app/Contents/Developer
Since upgrading to OS X 10.7.3 you see this Xcode build warning?
Icon specified in the Info.plist not found under the top level app wrapper: Icon-72.png (-19007) iPad: Icon.png: icon dimensions (57 x 57) don't meet the size requirements. The icon file must be 72x72 pixels, in .png format (-19014)
This is going to turn into an validation error as soon as you try to upload a new build to the AppStore™.
Here’s the fix:
Install a new version of the Application Loader. The download link is hard to find (hard to google), so here’s one for version 2.5.1 (most current when writing this article).
The most current version can be found under “Manage your applications” in iTunesConnect.
If you use Xcode 4 a lot this might have happened to you, too: Coloring and code completion fail and do not come back. Which makes working with Xcode almost impossible
This happens when Xcode’s indexing process fails for some reason. This can be a header file is missing to code highlighting (which can be different from the compiler in some cases) or in some cases a bad #define. The problem is that it fails silently so you cannot fix it.
After having this problem with a big project I stumbled onto the magic hint on Stack Overflow. After you quit Xcode enter this into a shell:
defaults write com.apple.dt.Xcode IDEIndexingClangInvocationLogLevel 3
After this you should open the project and see messages like this:
Xcode: IDEIndexingClangInvocation: Failed to save PCH file: /Users/user/Library/Developer/Xcode/DerivedData/Project-drsrrgaenperjadmqslqfxyqcqyt/Index/PrecompiledHeaders/Some-Prefix-cgepzuvkwimbsvcmqrbbpeoyhdpz_ast/Some-Prefix.pch.pth
Looking through these messages will show you what goes on and might help you finding the problem.
For me it was just copying header files from a framework on the place the Clang parser was looking for them.
It gets even better, because this also works in Mobile Safari on the iOS 5 Simulator!
Here’s a little script you can run, that enables the remote Web Inspector via gdb (via @atnan).
Here’s to all the mobile devs!
We recently stumbled across a blog post mentioning a way to enable a remote interface to a web inspector that is hidden inside the WebKit on iOS 5.
Here’s how it’s done. In your Application Delegate add the following code:
+ (void)initialize;
{
[NSClassFromString(@"WebView") performSelector:@selector(_enableRemoteInspector)];
}
With this you can direct your browser to http://localhost:9999 to open the web inspector.
Have fun!
Remember that this will influence you’re App Store review experience 
Ever wanted to symbolicate a incomplete crash file (i.e. the logs you get from TestFlight)?
You can symbolicate individual addresses from the crashlog in the terminal using a command named `atos` (if you’ve got the dSYM file for your build). Here’s an example:
atos -arch armv7 -o MyApp.app.dSYM/Contents/Resources/DWARF/MyApp 0x0000babe
This will output you the line of code related to this address. I.e.:
+[MyHappyClass fullOfFail] (in MyApp) + 429
Pro Tip: not entering the address when calling the atos command leaves you in STDIN mode. Here you can add multiple addresses without restarting the tool.
I’ve done this a few times, too but since came to the conclusion that it’s not a good idea to fiddle with UITableViewController. The alternative really is to use
UIViewController
and add a property
@property (weak, nonatomic) UITableView * tableView;
Then you build loadView like you did and assign the container view to self.view and the table view to self.tableView and all of a sudden you have all flexibility to put your table view wherever you like.
That way you are safe against implementation details in the UITableViewController which really assumes it owns the whole space of a container view and sometimes resizes the TableView. It’s especially an issue if you want to throw the whole thing into a NavigationController or if you have views to the left and right of the TableView. Except for that it’s really the same thing, everything you want to do to a TableViewController will work with this fake one, too.