To trim a string and remove whitespace and newlines:

NSString *trimmedString = [dirtyString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

For other character sets, see this reference page.

Jeff Lemarche, one-half of the dynamic duo behind the excellent Beginning iPhone Development book and also part-time Twitter prankster has an interesting post up on Differences in Delegation between Cocoa and Cocoa Touch (or, more specifically, a review of the merits of using formal vs. informal protocols for delegates).

Today, I ran across a use case where, unless I'm missing something, using an informal protocol is the only viable solution. Take this scenario:

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It appears that having your protocol conform to the NSObject protocol (@protocol MyProtocol <NSObject>) won't help you if you need to send performSelectorOnMainThread:withObject:waitUntilDone: messages to objects that conform to it (e.g., id myObj;). That's because the NSObject protocol doesn't declare that method.

Instead, declare the type of your objects as NSObject conforming to your protocol like this:

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• GHUnit = nicer unit testing with Xcode - All-Seeing Interactive
  If you've ever tried to setup unit tests in Xcode, you'll know what a PITA they can be, especially when it comes to trying to debug your tests. Gabriel Handford’s GHUnit is a unit testing framework with its own user interface, and is well worth a look. You can make tests by subclassing GHTestCase, but it also supports SenTestCase and GTMTestCase subclasses, and I was able to get the ASIHTTPRequest tests up and running in no time at all. There’s even a UI for running tests in the iPhone simulator...

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• Clang! And the bugs are gone! - All-Seeing Interactive
  The Clang Static Analyzer: I found and fixed around 20 Memex Trails memory leaks IN LESS THAN 10 MINUTES, including the time it took to download it and read the instructions!!

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