Answer to the question of ILeW with an article about what the real, attaching such as notifications and delegates work. Using a pattern we see first how the delegate pattern:
An object in search of a delegate
Articles Tagged 'Objective-C'
Objective-C: Addendum on notifications and delegates
Objective-C: how best to use the property list files
One of the advantages of the Property list files, which are simply text files that follow the XML standard, is that you can instantly be transformed into objects (such as array or dictionary) Objective-C. When you create a file list Property:
Xcode4: backward compatible code
Xcode 4 allows you to develop applications for iPhone or iPad with a target lower than today's iPhone OS 4.3. However the same code that comes with templates "sin" of arrogance, assuming that our application will target iPhone OS 4 or higher. Delegated in the application, for example, Xcode inserts the following lines of code:
1 2 3 4 5 6 7 | BOOL ) application : ( UIApplication * ) application didFinishLaunchingWithOptions : ( NSDictionary * ) launchOptions - (BOOL) application: (UIApplication *) application didFinishLaunchingWithOptions: ( NSDictionary *) launchOptions { / / Override point for customization after application launch. self.window.rootViewController = self.viewController; ; [Self.window makeKeyAndVisible]; ; return YES; } |
Objective-C: Notifications and Delegates
In Objective-C we have two very used to receive and send messages between classes: notifications and delegates. The difference between the two, besides being at the implementation level, substantially depends on "how" - objects - can receive a message. First let me show how the concept was born of delegate.
Objective-C: public, protected, and private
I wrote a similar article recently for ActionScript: ActionScript 3.0: public, protected, private and internal . Rereading it I realized two things: the first was the extreme resemblance to Objective-C, although the latter does not include internal .
Coding Guidelines
When no longer working alone for all developers comes time to find guidance in the writing of code. Protocols and standards that make it possible to "read" easily and intervene (more easily) in the code of others.
When we are working on a project more programmers, often of different languages, you must find a common form of writing, internal and external documentation standards in the code. In my work I am usually to interact with:
- Objet-C, C / C + +
- PHP
- HTML
- JavaScript
- Actionscript
- CSS
Common Queue, a simple solution
In asynchronous environments, where method calls or events are released daily bread (see Adobe ActionScript or Objective-C), often the same sequence of operations is not identical to the thousandth of a second. In addition, multiple methods can I call a more general function with the risk to cancel the effect of the other one o'clock.
To clarify the concept of a prime example. Environment is often used to activate the iPhone network indicator on the status bar, indicating that there is - precisely - "traffic" network, that you are performing a download or upload (downloading or sending data).
Variety of coding and coding in Objective-C ...
It was a bit 'that dealt with the subject , so I take this opportunity right away. Here are several ways to accomplish the same result in Objective-C. To you to discover what is the fastest and best!
Reverse an array
1 2 3 4 5 6 7 | / / To be implemented in a category / / Puts the elements of an array in reverse order NSMutableArray * ) reverse { - ( NSMutableArray *) {reverse int i = 0 ; i< ( floor ( [ self count ] / 2.0 ) ) ; i ++ ) for (int i = 0; i <( floor ([self count] / 2.0)) i + +) i withObjectAtIndex : ( [ self count ] - ( i + 1 ) ) ] ; [ExchangeObjectAtIndex self: the withObjectAtIndex: ([self count] - (i + 1))]; return self; } |
10 useful snippets Objective-C
Move the double-tap on the simulator
The simulator iPhones / iPad Xcode allows you to simulate the double tap the Alt key is pressed. This is useful to simulate the function of Pinch, that used to enlarge or scroll Keep away content in the view with objects or UIWebView . Well, some of you have noticed that the simulation of the "two fingers" proceeds in a symmetrical manner always starting from the center of the screen. To move this "center" is also just hold down the SHIFT key.
Objective-C: handle multiple animations with a single setAnimationDidStopSelector
è estremamente versatile, come già visto in setAnimationDidStopSelector: usi diversi ed avanzati . The setting of the end of animation, executed with setAnimationDidStopSelector , a class of UIView is extremely versatile, as seen in setAnimationDidStopSelector: different uses and advanced .
Let me now show you a technique very convenient when we have multiple animations and / or want to manage the queues (queue) of animations.
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