Download E-books iOS Recipes: Tips and Tricks for Awesome iPhone and iPad Apps (Pragmatic Programmers) PDF

By Matt Drance, Paul Warren

Take your iPhone and iPad apps to the following point. you will have noticeable cool positive factors and methods in different apps, yet have not had the time to truly inspect how they are performed. now we have the solutions for you. This ebook walks you thru fresh, reusable strategies to a wide selection of difficulties and styles universal to iOS improvement with Cocoa contact and Objective-C. With those recipes on your arsenal, your subsequent apps can be extra polished and extra maintainable than ever.

iOS Recipes starts with a travel of UIKit. Former Apple Evangelist Matt Drance and specialist graphical-systems programmer Paul Warren make it easier to write splash displays and embedded net browsers which are simply dropped into any undertaking. you will discover thoughts for construction complicated desk perspectives with out wasting your self in a sea of code, and spot the way to upload a few targeted visible touches to any table--even those you have already built.

Next you will discover Quartz and middle Animation, and you can stroll via a few fills, transforms, and animations that might breathe lifestyles into any app or online game. you are going to additionally find out about gestures, transitions, and customized controls to take your consumer interactions to the subsequent point.

You'll take on networking with a number of uncomplicated options to avoid pointless repetition on your codebases, and tackle a few extra complicated difficulties like importing huge records to an online server. eventually, you will see a few basic disciplines and concepts that might make architecting, debugging, keeping, and finally delivery your program more uncomplicated each time.

By the top of this booklet, you should have accelerated your iPhone and iPad improvement wisdom and be good in your solution to development stylish suggestions which are prepared for no matter what venture you are taking on next.

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No class can introduce new storage—properties or example variables which are created and retained, and eventually published within the classification’ -dealloc technique. As of Mac OS X Snow Leopard and iPhone OS three. 1, that’s not real. a brand new function of the Objective-C runtime, known as associative references, shall we us hyperlink items jointly utilizing a really simple key-value layout. With this option, we will be able to create the impact of a class that provides new garage to an latest type. ponder UITouch for instance. no matter if we’re writing a customized view, view controller, or gesture recognizer, it’s exceedingly convenient to grasp the unique element of foundation for a given contact resource. That info, in spite of the fact that, is misplaced after receiving -touchesBegan:withEvent. Our type can continue music of that, yet when we commence handling a number of contact assets, it turns into tricky. Plus, any code we write to trace this kingdom is caught in that view, view controller, or gesture recognizer—we need to port it ready solely for Mary Smithson 39. S TORE D ATA IN A C ATEGORY over to the other category we write later. It makes even more experience for the contact item itself to maintain song of its element of beginning. a class on UITouch known as PRPAdditions will deal with this via pointing out tools: one for storing the preliminary aspect, and one other for fetching it in the coordinates of the asked view. obtain TouchOrigin/UITouch+PRPAdditions. h @interface UITouch (PRPAdditions) - (CGPoint)prp_originInView:(UIView *)view; - (void)prp_setOrigin:(CGPoint)origin; @end take into accout, different types don't allow us to claim garage at the classification they expand; in simple terms tools do. this is often the place associative references are available. we'll shop the handed CGPoint in an NSValue item, and retailer that worth to our UITouch example as an associative reference utilizing the objc_setAssociatedObject runtime functionality. obtain TouchOrigin/UITouch+PRPAdditions. m - (void)prp_setOrigin:(CGPoint)point { objc_setAssociatedObject(self, &nameKey, [NSValue valueWithCGPoint:point], OBJC_ASSOCIATION_RETAIN_NONATOMIC); } The OBJC_ASSOCIATION_RETAIN_NONATOMIC parameter defines the garage policy—in this example, we wish to hold the NSValue. we will be able to additionally set a coverage of assign or reproduction, simply as with conventional Objective-C homes. The nameKey argument is used internally to shop the price, and needs to be precise. This guarantees that no different associative references clash with ours. the necessary kind is void *, so the easiest resolution is to claim a static char variable and cross its deal with, that is certain to be designated. obtain TouchOrigin/UITouch+PRPAdditions. m static char nameKey; Fetching the foundation aspect is straightforward: we go the tackle of our nameKey to objc_getAssociatedObject( ), and extract the CGPoint struct from the back NSValue. obtain TouchOrigin/UITouch+PRPAdditions. m - (CGPoint)prp_originInView:(UIView *)view { document erratum ready solely for Mary Smithson this reproduction is (B1. zero printing, March nine, 2011) 187 39. S TORE D ATA IN A C ATEGORY NSValue *valueObject = objc_getAssociatedObject(self, &nameKey); CGPoint aspect = [valueObject CGPointValue]; go back [self.

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