Articles Tagged 'Tutorials'


iPhone FontsBook: source code to display the system font

Rounding out the article How To: Custom fonts on iPhone OS 3. 2 I propose the FontsBook sources , a simple iPhone application that shows a table all system fonts, grouped by family.

FontsBookFontsBookFontsBook

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How to get Latitude and Longitude in Objective-C

The framework provides MapKit many useful features, except the return of Longitude and Latitude from an address. In JavaScript, for example, you can use the service provided by Google Geocoding and discussed in Google Maps: How to get Latitude and Longitude from an address . Apple iPhone or iPad, however, you can overcome this obstacle by using a different Google services. Specifically, you can call directly to the url:

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http://maps.google.com/maps/geo?q = [address] & output = csv

Where is [indirizzo] to enter the string with the address you want to transform coordinates. The output returned is of type:

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200,8,41.9128300,12.2241172

). The first value, 200 , indicates that everything went well ( 200 OK ). The second, 8 , Google is the accuracy parameter (1-10). The last two values ​​are, finally, latitude and longitude. Now we see a prototype of a method can be included in our applications:

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CLLocationCoordinate2D ) getLocationFromAddress : ( NSString * ) address { - (CLLocationCoordinate2D) getLocationFromAddress: ( NSString *) address {
urlString = [ NSString stringWithFormat : @ "http://maps.google.com/maps/geo?q=%@&output=csv" , NSString * urlString = [ NSString stringWithFormat: @ "% @ http://maps.google.com/maps/geo?q = & output = csv"
NSUTF8StringEncoding ] ] ; [StringByAddingPercentEscapesUsingEncoding address: NSUTF8StringEncoding]];

listItems = [ locationString componentsSeparatedByString : @ "," ] ; NSArray * ListItems = [locationString componentsSeparatedByString: @ ""];

/ / Int zoom = 0;
0.0 ; double latitude = 0.0;
0.0 ; double longitude = 0.0;

listItems count ] > = 4 && [ [ listItems objectAtIndex : 0 ] isEqualToString : @ "200" ] ) { if ([ListItems count]> = 4 & & [[ListItems objectAtIndex: 0] isEqualToString: @ "200"]) {
/ / Zoom = [[ListItems objectAtIndex: 1] intValue];
listItems objectAtIndex : 2 ] doubleValue ] ; Latitude = [[ListItems objectAtIndex: 2] doubleValue];
listItems objectAtIndex : 3 ] doubleValue ] ; longitude = [[ListItems objectAtIndex: 3] doubleValue];
{ Else {}
/ / Error
}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;

return location;
}

Notes of interest

, alla stregua della funzione explode ( ) del PHP per intenderci. The string returned in locationString is "split" by the method componentsSeparatedByString , like the function explode ( ) in PHP for instance. I put the example I proposed - but commented - the code to retrieve even the Google accuracy parameter, precision or scale factor, denoted by zoom .

Source as

For completeness, I made ​​a small example application with which you can try the method proposed above, enter any address and the iPhone will show on the map.


Download Source

I thank the team devAPP for the inspiration of this article.

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Adobe Flash CS4: Create an Ajax Loader or Activity Indicator

Create an Ajax Loader (or Activity indicator for those who are already accustomed to using the Apple iPhone) for the Web is not a difficult thing: there are services that generate animated gif images of all types. However, the GIF format has the big drawback of not supporting transparent as it should. Transparency in GIF current plan involves only one bit with the consequence that if we do not have a background color uniform, the edges of the image are noticeably grainy and fragmented.

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Retrieve the images loaded in a Post

When writing a Post in WordPress you can upload images to the same time writing the article. These images, which are part of the media library, are associated with that particular post. The peculiarity of this behavior lies in the ability to extract these images no matter if they were physically placed inside the post.

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Photoshop tutorial: effects with shadows

In this tutorial I will show you some special effects that can be applied to a simple rectangular object by playing with the shadows. Obviously I do not mean shadow effect applied on a layer, but real shadows created manually. First draw a rectangle on a layer like this:

Rettangolo

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iPhone SecondApp: Guess the number - Part 2

As mentioned FirstApp iPhone: Guess the number - Part 1 we see how to make an application for the Apple iPhone without using Interface Builder! Indeed, we will eliminate physical files created by Interface Builder, Xcode wizard. At the end of this post, then, we have an application identical in all respects, to that achieved in the first part, with the difference that we will achieve all our visual components, including the main Window, completely to code.

The application already made, if you just want to download, is available on my Google Code repository:

I would like to point out immediately as the ZIP of this example weighing less than the last time! :)

We create the project

We start by creating our project SecondApp (to distinguish it from FirstApp), although this time choose Window-based Application:

newproject

Now let's delete everything related to Interface Builder. : eliminatelo anche dal file system, quindi selezionate Also Move to Trash . Delete the file MainWindow.xib , located in the folder Resources : also delete it from the file system, then select Also Move to Trash. nella casella Main nib file base name : Select then the file SecondoApp-info.plist and delete the reference to the MainWindow nib box Main base file name:

deleteib

At this point we no longer have any Windows, at least through Interface Builder. , e modifichiamo la funzione main() in questo modo: So we open the file main.m , situated in Other Sources , and modify the function main() like this:

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int argc, char * argv [ ] ) { int main (int argc, char * argv []) {

pool = [ [ NSAutoreleasePool alloc ] init ] ; NSAutoreleasePool * pool = [[ NSAutoreleasePool alloc] init];

/ / By removing the file. XIB we missed the point
/ / Delegate to the JPA, then pass it to "hand"
UIApplicationMain ( argc, argv, nil , @ "SecondAppAppDelegate" ) ; int retVal = UIApplicationMain (argc, argv, nil, @ "SecondAppAppDelegate");

; [Pool release];
return retVal;
}

Open SecondAppAppDelegate.me then create the main Window in code:

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void ) applicationDidFinishLaunching : ( UIApplication * ) application { - (Void) applicationDidFinishLaunching: (UIApplication *) application {

/ / Get the screen size (320, 480)
UIScreen mainScreen ] applicationFrame ] ; CGRect windowRect = [[UIScreen Mainscreen] applicationFrame];
/ / Create a window - as we have done in Interface Builder bye bye
[ [ UIWindow alloc ] initWithFrame : windowRect ] ; MainWindow UIWindow * = [[UIWindow alloc] initWithFrame: windowRect];
/ / Set the background of the Window to yellow, to differentiate
/ / The previous application FirstApp
[ UIColor yellowColor ] ] ; [MainWindow setBackgroundColor: [UIColor yellowColor]];

mainWindow ] ; [Self setWindow: mainWindow];
; [Window makeKeyAndVisible];

; [MainWindow release];
}

You can already test the application, if you get a yellow window you did everything right!

, necessario solo se si usa Interface Builder. In the file SecondAppAppDelegate.h we can eliminate IBOutlet , only needed if you use Interface Builder. Also add here that our global variables, the last time we had entered in the Controller. Then modify the file SecondAppAppDelegate.h :

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# Import <UIKit/UIKit.h>

NSObject <UIApplicationDelegate> { @ Interface SecondAppAppDelegate: NSObject {<UIApplicationDelegate>
UIWindow * window;

UITextField * number;
UIButton * button;
numeroACaso int;
}

nonatomic, retain ) UIWindow * window; @ Property (nonatomic, retain) UIWindow * window;

void ) controllaNumero; - (Void) getNumber;

@ End

, in quanto non stiamo usando Interface Builder. Again we have prepared the method definition controllaNumero , like last time, but we have eliminated the indication IBAction , because you are not using Interface Builder.

We build the interface from code

It 'time to create code using all components of our interface. ed inseriamo il seguente codice: Let's go back to the file SecondAppAppDelegate.m , posizioniamoci before [mainWindow release] and insert the following code:

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/ / Create the title bar
[ [ UINavigationBar alloc ] initWithFrame : CGRectMake ( 0.0 , 0.0 , 320.0 , 44.0 ) ] ; UINavigationBar myNavigationBar * = [[UINavigationBar alloc] initWithFrame: CGRectMake (0.0, 0.0, 320.0, 44.0)];
myNavigationBar.barStyle = UIBarStyleDefault;
[ [ UINavigationItem alloc ] initWithTitle : @ "Indovina un numero" ] ; UINavigationItem navigationItem * = [[UINavigationItem alloc] initWithTitle: @ "Guess a number"];
navigationItem animated : NO ] ; [MyNavigationBar pushNavigationItem: navigationItem animated: NO];
myNavigationBar ] ; [Window addSubview: myNavigationBar];

/ / Create the label
[ [ UILabel alloc ] initWithFrame : CGRectMake ( 10 , 50 , 300 , 80 ) ] ; UILabel myLabel * = [[UILabel alloc] initWithFrame: CGRectMake (10, 50, 300, 80)];
UIColor clearColor ] ; myLabel.backgroundColor = [UIColor clearColor];
; myLabel.numberOfLines = 2;
"iPhone ha pensato un numero da 1 a 10, prova ad indovinarlo?" ; myLabel.text = @ "iPhone has designed a number from 1 to 10, try to guess?"
myLabel ] ; [Window addSubview: myLabel];

/ / Create text input
UITextField alloc ] initWithFrame : CGRectMake ( 10 , 120 , 300 , 30 ) ] ; number = [[UITextField alloc] initWithFrame: CGRectMake (10, 120, 300, 30)];
numero.borderStyle = UITextBorderStyleRoundedRect;
numero.textAlignment = UITextAlignmentCenter;
numero.keyboardType = UIKeyboardTypeNumberPad;
"Inserisci il numero" ; numero.placeholder = @ "Enter the number";
numero ] ; [Window addSubview: number];

/ / Create the button
UIButton buttonWithType : UIButtonTypeRoundedRect ] ; button = [UIButton buttonWithType: UIButtonTypeRoundedRect];
10 , 180 , 300 , 30 ) ; bottone.frame = CGRectMake (10, 180, 300, 30);
@ "Premi qui" forState : UIControlStateNormal ] ; [Button setTitle: @ "Click Here" Forst: UIControlStateNormal];
self action : @selector ( controllaNumero ) forControlEvents : UIControlEventTouchUpInside ] ; [AddTarget button: self action: @ selector (getNumber) forControlEvents: UIControlEventTouchUpInside];
bottone ] ; [Window addSubview: button];

; [MyLabel release];
; [NavigationItem release];
; [MyNavigationBar release];

della scorsa volta, subito dopo il [mainWindow release]; inseriamo: Since the ' applicationDidFinishLaunching corresponds to viewDidLoad as last time, just after the [mainWindow release]; insert:

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+ arc4random ( ) % 10 ; numeroACaso arc4random = 1 + () 10%;

Now we can do is implement the method controllaNumero , which will be identical (apart from the prototype) to that used last time:

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void ) controllaNumero { - (Void) {getNumber
"Premuto bottone di controlla numero" ) ; NSLog (@ "Pressed button control number");
[ numero.text integerValue ] ; numeroInserito = int [numero.text integerValue];
message; NSString * message;
"Il numero inserito è %d" , numeroInserito ) ; NSLog (@ "The number entered is% d", numeroInserito);
numeroInserito <numeroACaso ) { if (numeroInserito <numeroACaso) {
"Troppo basso..." ; message = @ "Too low ...";
( numeroInserito> numeroACaso ) { } Else if (numeroInserito> numeroACaso) {
"Troppo alto..." ; message = @ "Too high ...";
( numeroInserito == numeroACaso ) { } Else if (numeroInserito numeroACaso ==) {
"Bravo hai indovinato" ; message = @ "Bravo, you guessed it";
+ arc4random ( ) % 10 ; numeroACaso arc4random = 1 + () 10%;
"Numero pensato %d" , numeroACaso ) ; NSLog (@ "Number% d thought," numeroACaso);
}
[ [ UIAlertView alloc ] UIAlertView alertMessaggio * = [[UIAlertView alloc]
"Responso" initWithTitle: @ "Response"
message: message
delegate: nil
"OK" cancelButtonTitle: @ "OK"
] ; otherButtonTitles: nil];
; [AlertMessaggio show];
; [AlertMessaggio release];
"" ; numero.text @ = "";
}

We're done!

Conclusions and considerations

, proprio perchè volevo lasciarlo il più semplice e snello possibile e, anche, per dimostrare che non sono elementi sempre necessari. This example does not make direct use of a UIView or UIViewController , just because I wanted to leave it as simple and streamlined as possible and, also, to show that the elements are not always necessary. However insert objects directly in the window can have some sense in this example and other sporadic contexts. portano comunque benefici in tantissimi altri casi, ein alcuni sono praticamente indispensabili; come avremo modo di vedere in futuro. The use of UIView and UIViewController bring benefits in many other cases, however, some are virtually indispensable ein, as we will see in the future.

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WordPress: use shortcodes

From version 2.5 of WordPress (preferably 2.5.1) are available so-called shortcodes , a procedure that allows the creation of callback hooks or rather, when the text of our post is found a string formatted with brackets like [id_shortcode] . Prior to the release of WordPress 2.5 shortcodes were implemented manually (see Napolux ), now you can exploit with more simplicity and for different uses.

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iPhone FirstApp: Guess the number - Part 1

The first source that I rose in my hands was written in Basic and consisted of a few lines of code, for enlightening me. It was a simple game that generates a random number from 1 to 10 and, through keyboard input, verify that the number entered was Maggioni, less than or equal to the random number. Despite its rough simplicity remains, for me, one of the best examples - simple, fun and practical - to explain to those who do not know anything about programming what is meant actually for "computer program". So I decided to propose it for Apple iPhone, maybe will help someone ...

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Photoshop tutorial: text warp at will

Perhaps not everyone knows about the potential of text handling in Photoshop, in particular the fact that it can manipulate text in ways very advanced. For example if we wanted to "bend" text, we would be tempted to use the "Create Warped Text" Altera testo , Which opens a window with these settings:

Altera testo

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Actionscript 3.0 for beginners: lesson # 5

Who has started to develop code with scripting languages ​​such as JavaScript or ActionScript the same, may not know all the concept of data type. With some high-level languages, in fact, it used to - at best - to declare variables without giving a specific data type, not counting those languages ​​that do not require any statement (such as PHP - not in the strict version 5 ).

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Stop SOPA