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In most cases, either because we are used or because we have seen in tutorials and in some text to setAnimationDidStopSelector like this: PLAIN TEXT Objective-C: [UIView beginAnimations: nil context: NULL], [UIView setAnimationDuration: 1.5 ] [UIView setAnimationCurve: UIViewAnimationCurveEaseInOut] [UIView setAnimationDelegate: self], [UIView setAnimationDidStopSelector: @ selector (removeView)]; myView.alpha = 0; [UIView commitAnimations] / / - (void) (removeView [MyView removeFromSuperview] ;) The code above sets the setAnimationDelegate self as delegate and through [...]

After explaining how to locate our strings in Xcode, as we see now is simple - using the same technique - locate images / views / interfaces built with Interface Builder. Locate graphics resources process, as mentioned, is the same, if we have a ' image already included in our resources, or places a new, and we want to "locate" - that is [...]

Create your own protocol may be useful in a host of cases

Perhaps I should have written "Very very very, short snippets," but it is an excellent and convenient "trick" that I am about to show. Doing the "two" lines of code shown below, you can get the output of any URL and manipulate it. PLAIN TEXT Objective-C: NSString * url = [NSString stringWithFormat: @ "http://www.appleside.it/ "]; NSString * result = [NSString stringWithContentsOfURL: [NSURL URLWithString: url] [...]

I would like to show and discuss some examples on how to add and manipulate properties in a Class Objective-C. A classic example, precisely, is as follows: in the definition of our interface class defines two properties name: PLAIN TEXT Objective-C: / / MyClass.h <Foundation/Foundation.h> # import @ interface MyClass : NSObject (NSString * name; NSString * name;) @ property (retain) NSString * name; @ property (retain) NSString [...]

Both Mac OS X and iPhone OS, we can have easy and direct to the directories - more important - the system which are: PLAIN TEXT CODE: NSHomeDirectory Returns the path to the current user's home directory. NSHomeDirectoryForUser Returns the path to a given user's home directory. NSTemporaryDirectory Returns the [...]

Syntax NSLog (@"%@", ...) works and is used to obtain information about objects, but does not work on C data types like struct CGRect or CGPoint, for example. To realize NSLog (@"%@", ...), also on struct type C can rely on conversion functions as NSStringFromCGRect () or NSStringFromCGPoint: PLAIN TEXT Objective-C: CGrect mioRect = (CGRect) (10, 20,30,40); CGPoint mioPoint [...]

XCode is a very powerful development environment and reserves some surprises. It permits a function similar to "snippets" of the famous editor TextMate. In practice, you can insert blocks of code using the key sequence ESC + a combination of one or more sequences of characters. For example if you want to enter a block if [...]

If you need to generate random numbers in an application from the Apple iPhone you have to put Objective-C, because it proposes no class for this purpose. The solution is that proposed by the C: rand (), srand (), random (), srandom () and arc4random (). Of all the most popular is definitely arc4random (), because it requires no special initialization or duties of [ ...]

Normally, an event which is nothing but a message is fixed (set and implemented) in the same class or context, function or procedure "caller." For example if we add a button away UIButton code (programmatically), we can find our class inside a UIView or a UIViewController. In both cases the task allocation and [...]