NSZone is Apple’s way of optimizing object allocation and freeing. NSZone is not an object; it is an opaque C-struct storing information about how memory should be handled for a set of objects. One rarely needs to worry about handling your own zones in applications; Cocoa handles it transparently. A default NSZone is created on … Read more
I looked into this before buying a Mac Mini. The answer is, essentially, no. You pretty much have to buy a Leopard Mac to do iPhone SDK development for apps that run on non-jailbroken iPhones. Not that it’s 100% impossible, but it’s 99.99% unreasonable. Like changing light bulbs with your feet. Not only do you … Read more
If you are dealing with financial computations, you really should use base-10 arithmetic to avoid the rounding errors that can occur with the standard base-2 floating point types. So it’s either NSDecimal or NSDecimalNumber. And since you’re writing object-oriented code, NSDecimalNumber is the right choice for you. To answer your questions: only testing of your … Read more
Let me put it this way: Don’t just try to port all your stuff over to the Mac without thinking about design principles. A lot of developers are seeking to get on the Mac developer bandwagon without putting time into their apps. Simply moving apps from iOS to Mac doesn’t bring forth good interfaces. Face … Read more
That’s because your CustomiPhoneLib.a is a fat library, i.e., a library that contains more than one target architecture, namely armv6 and armv7 on iOS. You can use lipo to extract a specific architecture into another .a file, use ar and ranlib to manipulate it at will, and then use lipo again to recombine the manipulated … Read more
A variation on this should fix both the leaking and zombie issues: – (void)loadRequest:(NSURLRequest *)request { [self retain]; if ([webView isLoading]) [webView stopLoading]; [webView loadRequest:request]; [self release]; } – (void)webViewDidStartLoad:(UIWebView *)webView { [self retain]; } – (void)webViewDidFinishLoad:(UIWebView *)webView { [self release]; } – (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { [self release]; } – (void)viewWillDisappear { if … Read more
If you’re trying to show the activity wheel in a navigation bar button (e.g. you might have a refresh button on your navbar) – you can create a new UIBarButtonItem with a custom view being the UIActivityIndicatorView: Objective-C uiBusy = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; uiBusy.hidesWhenStopped = YES; [uiBusy startAnimating]; [self.navigationItem.rightBarButtonItem initWithCustomView:uiBusy]; Swift let uiBusy = UIActivityIndicatorView(activityIndicatorStyle: … Read more