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    <p>You're really asking two questions here, I think: "How do you stretch an image on a button?" and "What do you do when code doesn't work?" I'll take the former first. The following code works for me to create a button from scratch with a stretched image:</p> <pre><code>UIImage *image = [[UIImage imageNamed:@"ButtonPic"] stretchableImageWithLeftCapWidth:19 topCapHeight:19]; CGRect frame = CGRectMake(80, 200, 160, 40); UIButton *button = [[UIButton alloc] initWithFrame:frame]; [button setBackgroundImage:image forState:UIControlStateNormal]; [self.view addSubview:button]; [button release]; </code></pre> <p>You'll need to supply an appropriate image, naturally. My image is a 80x40 px PNG image created in Photoshop, stretched to a width of 160 px above. Here's what it looks like:</p> <p><img src="https://i.stack.imgur.com/H0f6G.png" alt="button screenshot"></p> <p>I don't see any significant differences between my code and <a href="http://books.google.com/books?id=TcP2bgESYfgC&amp;lpg=PA93&amp;ots=dipaKqrQCM&amp;dq=lamarche%20UIButton&amp;pg=PA93#v=onepage&amp;q&amp;f=false" rel="nofollow noreferrer">the code in the book</a>. It looks like the button in the book is loaded from a nib instead of created programmatically, but mine and theirs both call -stretchableImageWithleftCapWidth:topCapHeight: and -setBackgroundImage:forState: to do the relevant work.</p> <p>That brings us to the second question: "What do you do when code doesn't work?"</p> <p>There's not a single answer here, but the first thing to do is narrow the problem as much as you can. Arthur Conan Doyle wrote: <em>"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."</em> In a case like this one, where you've just got a few lines of code, an easy way to do that is to isolate the problematic code by copying it into a new project. It only takes a moment to create a new iOS project based on the view template, and you can paste the code above into the -viewDidLoad method of the supplied view controller to try it out. Then all you need to do is to supply an image. If it still doesn't work, you've removed all the other code in your app from suspicion. If it does work, you can gradually add some more code from your app in an attempt to reproduce the problem and identify the cause. Moving your code to a test project isn't always feasible, but you can usually find ways to simplify the problem.</p> <p>As far as errors go, bear in mind that code often fails even when every function and method succeeds. The problem isn't with the components, but with how they're put together.</p>
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    1. POHow to determine method error (Objective C/iPhone/xCode)?
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    1. COHi Caleb - "There's not a single answer here, but the first thing to do is narrow the problem as much as you can". In Windows, I check a BOOL. If the result is false, I call `GetLastError`. In Linux, I check a INT. If the result is < 0, I check `errno`. What method does the world's "Most Advanced Operating System" (per Apple's literature) provide to check for the result of a function call/method? The best I can tell, the only thing I can do is wait to see if the widget draws properly. If it does not draw properly, I have to grep Stack Overdlow looking for the right knobs to turn. Jeff
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    2. COHi Caleb - "There's not a single answer here, but the first thing to do is narrow the problem as much as you can". I'm not trying to beat a dead horse, but there *must* be a single answer. If there were not, how can a program tell there is an error, and how can a program determine an irrecoverable state where it must not process any further? Sorry to beat a dead horse (I'm kinda worked up about this). Jeff
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    3. COI answered your original question to the best of my ability, and I'm now sorry that I invested the time that I did responding to what seems to be more a rant than a real question. Mechanisms for reporting errors at the various levels of API are well documented, from errno to NSError to NSException, and if you're asking in earnest I invite you to visit the documentation. Also, feel free to post your code -- I'm sure someone will spot your error in a minute or two.
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