iPad

August 23, 2012

Localize iOS app at runtime.

Hello again,

This tutorial will show you how to localize your app at run-time, please feel free to check an example in github/iOS-Localization.

First of all, download the Language.h/m class from the repository and add them to your project.

  • after that import the Language.h to your class like this:

#import “Language.h”

  • In your appDelegate, set your startup language like this:

[Language setLanguage:@”en”];

  • Create a localize string file that contain all your strings localized depending on the languages you choose.(Please check the example in the repository).
  • To get the string based on the selected language, use the method in the Language class:

[Language get:@”title” alter:@”title not exisit”];

That’s it, for more understanding of how to do this clearly, please check the example in the github.

Thank you and stay tuned for more tutorials soon.

July 28, 2012

How to call an objective-c method from JavaScript

As the title says, call an objective-c method from Javascript/HTML file. Let’s talk about the Javascript side, we have to request a new URL with a specific string and this is done in Javascript side by

function communicateWithObjectiveC () {

window.location = “js-call:myObjectiveCFunction:” + names;

}

This will make the UIWebView call a delegate method, which is :

– (BOOL)webView:(UIWebView *)webView

shouldStartLoadWithRequest:(NSURLRequest *)request

navigationType:(UIWebViewNavigationType)navigationType {

In this method, we can search the new request string by using:

if ([[[request URL] absoluteString] hasPrefix:@”js-call:”]) {

after that, we call the method that we want by:

[self performSelector:NSSelectorFromString(function)];

If we wrap up the previous codes (Objective-c side), the method will look like this:

– (BOOL)webView:(UIWebView *)webView

shouldStartLoadWithRequest:(NSURLRequest *)request

navigationType:(UIWebViewNavigationType)navigationType {

// Intercept custom location change, URL begins with “js-call:”

if ([[[request URL] absoluteString] hasPrefix:@”js-call:”]) {

NSString *requestString = [[request URL] absoluteString];

// Extract the selector name from the URL

NSArray *components = [requestString componentsSeparatedByString:@”:”];

if ([[components objectAtIndex:1] isEqualToString:@”myObjectiveCFunction”]) {

NSString *function = [components objectAtIndex:1];

// Call the given selector

[self performSelector:NSSelectorFromString(function)];

}

// Cancel the location change

return NO;

}

// Accept this location change

return YES;

}

That’s it, piece of cake 🙂

If there is any ambiguity, don’t be shy, just ask.

Be tuned for the next Tutorial.