The class MPMoviePlayerController has the big drawback of not properly handle multiple concurrent video, as well as make it difficult to create a video sequence, one after another. che è una sottoclasse di AVPlayer ), appartenente al framework più a basso livello AVFoundation , è invece estremamente più versatile, nonostante mantenga egualmente una semplicità nell'implementazione. The class AVPlayer (or AVQueuePlayer which is a subclass of AVPlayer ) belonging to the lower-level framework AVFoundation , but it is extremely versatile, equally despite maintaining simplicity in implementation.
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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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1. Strings on multiple lines
In Xcode, you can "break" a string across multiple lines by inserting at the end with a backslash "\". This feature can be useful when, for example, we want to insert the HTML text in a control UIWebView :
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Xcode is a really good development environment, nice and full of details that make writing efficient code and pleasant. Among these is the ease of auto-complete when typing, especially when writing applications for Apple iPhone, where the frameworks are many and remember syntax and nomenclature company by a few.
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As seen in the post Variety of coding and coding approaches that a developer may have to solve a problem are multiple and diverse for the same programming language used. Here's how some of the most popular JavaScript frameworks have solved a simple function of CamelCase :
Prototype.js
Prototype.js , version 1.6.0.3, explicitly proposes a method camelize() to make the camelcase on a string. The author's approach is quite simple and the code is self-explanatory. In this case it was not made any use of Regular Expression!
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| ( ) { camelize: function () {
this . split ( '-' ) , len = parts. length ; var parts = this. split ('-'), len = parts. length;
len == 1 ) return parts [ 0 ] ; if (len == 1) return parts [0];
this . charAt ( 0 ) == '-' camelized var = this. charAt (0) == '-'
0 ] . charAt ( 0 ) . toUpperCase ( ) + parts [ 0 ] . substring ( 1 ) ? Parts [0]. CharAt (0). ToUpperCase () + parts [0]. Substring (1)
0 ] ; : Parts [0];
var i = 1 ; i < len ; i ++ ) for (var i = 1, i <len; i + +)
i ] . charAt ( 0 ) . toUpperCase ( ) + parts [ i ] . substring ( 1 ) ; camelized + = parts [i]. charAt (0). toUpperCase () + parts [i]. substring (1);
camelized return;
} |
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A good developer has no problem to switch from one programming language to another. The choice to focus on a particular language, framework or development environment, is dictated more by the availability of time and the type of work that takes place. However, an important factor that may influence the choice of "frameworks" such is the sympathy and affection that can mature over time.
Specifically, I wanted to analyze some - certainly not all - JavaScript frameworks available today, because even "advised" to take a look especially at jQuery .
The creators of mootools (one of the most popular JavaScript frameworks) have made available a tool to run a speed test and validity of five well-known JavaScript frameworks: Slickspeed . This test, the outcome is not discounted at all, it is important to operate as client-side Javascript frameworks, that are executed by your browser. It is precisely for this reason that some find Safari faster than Internet Explorer or Google Chrome faster than Firefox . However, this often depends on the type of page you are viewing. Indeed, it may well happen that a particular site is really more "fast" when viewed in Safari, but this does not mean that "all sites" will be faster with Safari! Obviously this is true for any other browser.
The benchmark
In the test I made with Slickspeed I compared the browsers available on my machine (Windows Vista 64bit Utilmate - Intel Core 2 Quad 2.4GHz with 8Gb RAM).
Unfortunately, the tests are not able to run with Internet Explorer 7, as the car crashed, even going out of scale with the results! Once again, congratulations Microsoft.
I crercato to maintain the same status of the PC during the test run, opening the browser and not individually by sending no other processes running.
Note: If you feel like you also run one or more of these tests, you can comment this post in case of "curious" and several results.
Google Chrome is really fast results, with a value of 68 (average) in the test with jQuery . The slower, however, was Flock , despite coming from the same "mother" Mozilla. This poor performance of Flock is really curious as its cutting social networks, because it is precisely the Social Network Web 2.0 to take advantage of many JavaScript frameworks available, so as to provide an experience of truly innovative navigation and interaction.
Surprisingly beats FireFox and Opera also has a nice little ', achieving even a 74 in the performance of Dojo ! FireFox and Safari, on balance, are similar, with Safari faster in tests with Mootools and jQuery.
Which framework to choose?
If you do not mind you testing the speed of execution and do not worry about the normal size in Kbytes of the same framework, the answer might be "what you like" or, if you like, "what you know better or is more harmonious with your style of programming. "
Ultimately, these frameworks will look a bit 'all (see for example the use of $), despite some important and substantial differences that can jump in the eyes of an expert or really pushed the use of a particular library. In principle, in fact, everything that can be done with jQuery, for example, you can do very well with mootools or prototype! If jQuery has a very compact syntax, as all methods always return the jQuery object basis, thus creating endless rows of oggetto.metodo().metodo().metodo()... is said that this is all costs a strength, especially for those who will have to debug!
Libraries like prototype.js sin, perhaps in the absence of effects, even simple, forcing the developer to implement as a spinoff scriptaculous.js , heavy and far from the library first choice.
An example
This last reason, for example, led me to replace the coupled prototype / scriptaculous with jQuery to create interactive panels / Animated undolog.com here in the sidebar. In fact, even using Google API to import libraries, it is wasteful to load all the library and scriptaculous for a slideDown slideUp. For information and an example, here is the Javascript code as it was coupled with the prototype / scriptaculous:
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| / / Prototype / scriptaculous
) . each ( $ $ ('H2.dropdown'). Each (
element ) { function (element) {
= "pointer" ; element. style. cursor = "pointer";
'click' , element. observe ('click',
event ) { function (event) {
this . next ( ) . style . display == "" ) new Effect. BlindUp ( this . next ( ) , { duration : .5 } ) ; if (this. next (). style. display == "") new Effect. BlindUp (this. next (), {duration: .5});
Effect. BlindDown ( this . next ( ) , { duration : .3 } ) ; Effect else new. BlindDown (this. next (), {duration: .3});
event ) ; Event. Stop (event);
}
)
}
); |
and it is now with jQuery:
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| / / JQuery
) . each ( $ ('H2.dropdown'). Each (
i ) { function (s) {
) . css ( 'cursor' , 'pointer' ) . click ( $ (This). Css ('cursor', 'pointer'). Click (
function () {
$ ( this ) . next ( ) . is ( ':hidden' ) ) $ ( this ) . next ( ) . slideDown ( ) ; else $ ( this ) . next ( ) . slideUp ( ) ; if ($ (this). next (). is (': hidden')) $ (this). next (). slideDown (); else $ (this). next (). slideUp ();
}
);
}
); |
All in all, a closer look, I do not think there is a lot of difference! But as I said before ... the question is "also" of personal taste.
Continued ...
What?
N3TV Interactive Platform is the platform of interactivity N3TV.it , the brainchild of Thomas Tessarolo , "Blogger Action" argues that if Net TV is certainly not restricted to words alone, but acts concretely experiencing at first hand what means "to Net TV", offering software tools able to provide next-generation online interaction.
Platform Interactive Platform N3TV therefore has the objective to provide interactivity during the numerous proposals on live television N3TV.it .
N3TV.it: one with N3TV Interactive Platform
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It is available to update the Aptana IDE , the Web development environment that supports Adobe AIR and Apple iPhone . Among the changes include the improvement of the section with the update of the PHP Code Assist functions on both parameters. Also improved the "color" of the code. Added support for latest Ajax frameworks including prototype.js and jQuery . Also improved handling of Javascript.
For the complete list of new features click here .
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Among the various libraries - or set of libraries (real framework), dedicated to Ajax, HTML and Web 2.0 interface extension that I've seen, Ext is definitely worthy of note. The website and documentation are well done and organized, also the demo is not to be missed. The graphical user interface, compatibility with Prototype and Scriptaculous , and Yahoo Utils impletazione of, at least make it an interesting system! Beware though the license! Despite presenting himself as open source and free for personal use, requires a fee to enhance the use and care. The latter, in fact, is never to be underestimated in the framework of some complexity.
For documentation and demo click here .
In particular I mention this system, I'm still analyzing in detail, as it has been used to create Fresh Feed Reader , one of the sample applications provided with the release of Adobe Apollo Alpha (see Adobe Apollo Alpha Release ). Fresh, therefore, is example of a double of Apollo, which demonstrates its ability to leverage HTML and JavaScript at the most. Fresh, in fact, is not a pure Apollo, but uses the framework Ext - and then you need JavaScript and HTML - Apollo in the engine! Great!
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