Raised center TabBar button in Cordova / PhoneGap for iOS

A popular pattern in iOS lately (especially in apps with a focus on photo taking) is the raised / highlighted middle TabBar button. It’s easy enough to get a native TabBar in an iOS PhoneGap app using one of the two popular plugins (NativeControls and TabBar). There is even a great article on getting a raised middle TabBar button on iOS.

But not everyone using PhoneGap can comfortably turn that article into a modified TabBar plugin. There was even a recent thread on this topic in the PhoneGap Google Group recently.

Since I have done this in one of my apps, I thought I might post a quick outline on how to use the code in the iDevRecipes article above to get one of these buttons into one of the plugins above.

The Button Image

aperture-tab.png

This is the button I created for my app Pixfor. It’s basically just a green tinted screenshot of the middle third of a standard TabBar with an Aperture icon and a subtle shadow. You certainly don’t need to have a tinted gradient as well as your larger icon or whatever. That’s just a design decision. The great thing about how this works is that the touch goes straight through the added UIButton, so the highlight of the TabBar still happens so if your button image has transparency, it will show through nicely.

The button image is named aperture-tab.png and also has a corresponding aperture-tab@2x.png image for retina devices.

Note: these images (unlike the icons normally used in the TabBar plugins as icons) are added to the project through XCode as a resource, not just copied into the www folder with the other PhoneGap assets.

The JavaScript Code

For the JavaScript code, all you really need to do is create a TabBar item with an empty label and an empty icon.

For example, in NativeControls:

window.plugins.nativeControls.createTabBarItem("takepix", "", "", options);

and in TabBar:

window.plugins.tabBar.createItem("takepix", "", "", options);

The Objective-C Code

Pixfor happens to use the NativeControls plugin, but the code below should work in both.

They both have a method in their respective .m files that creates the TabBar (create in TabBar and createTabBar in NativeControls). *

Both these methods end with

[self.webView.superview addSubview:tabBar];

What we are going to do is add the following code directly after this line before the closing brace.

This code will add a custom UIButton using our image centered on our TabBar. Note the file name aperture-tab.png in the first line. The retina @2x version does not need to be explicitly referenced.

Pixfor's raised middle button

And there it is! Our special TabBar button.









* Line numbers only used for illustration. Please find the methods above in the plugin’s latest version.

First rejection

So I know I haven’t been posting here much, what can I say?

But I did feel like posting that I have had my first ever rejection experience with the Apple App Store.

An app I have been building for a client got rejected for collecting donations for charity — even though the app did not collect actual money, it merely allowed you to convert points earned in the app to a charitable donation.

The reviewer was very nice about it and offered some suggestions on how to comply with the rules in this area.

Here is where this post turns into a love letter to PhoneGap/Cordova and KendoUI.

The easiest way to comply was to have the actual charitable donation aspect happen on a web site and have the app kick the user out of the app to said web site to complete the donation. If the app had been native I would have had to re-write all my logic and create a web site appropriate for a mobile device, etc. However, since the app was a hybrid app using PhoneGap and KendoUI, all I had to do was copy some of the app into a standalone website using the same UI and the same JavaScript logic. Then I added a button from the website sending the user back to the app using URI schemes in iOS (the Android version of the app can stay how it was).

Like magic, I now have the charitable donations happening on a web site instead of the app, but with very little effort and it even looks the same aesthetically as the app!

The app has been resubmitted and our fingers are once again crossed.

As for the other problem (a lack of decent posts on this blog) I have been storing some up that I did not want to post until this app was finished. They should be coming very soon. I hope. Heh.

Pixfor is live.

The side project I have been working on for the last two months is finally live.

http://pixfor.me

Pixfor is, in many ways, the 21st century update on the idea of leaving disposable cameras on the tables at weddings. It is also a great deal more than that.

It’s a combination of an app (currently iOS only) and a SaaS web site. 

I have so much I haven’t had time to post about here and hope to finally get around to it now that Pixfor is launched (albeit very softly so far).

Announcing the Read it Later plugin for PhoneGap (soon also for Cordova)

One of the developers working on the new PhoneGap-based Wikipedia Mobile was having some annoying issues with the PhoneGap ShareKit plugin and decided he’d rather just put the Facebook and Twitter sharing in with their individual plugins. 

He was happy with the decision where Facebook and Twitter were concerned, but lamented that the decision would mean there would no longer be support for Read it Later (http://readitlaterlist.com).

I had a look at Read it Later’s API and iOS SDK and it looked fairly straight forward, so when he asked if I would like to write a plugin for it I took on the challenge.

Just two hours later I had a shiny new PhoneGap plugin!

https://github.com/devgeeks/ReadItLaterPlugin

If you wanna be as cool as Wikipedia, run over to GitHub and clone it into your app now! 

Installation

This plugin allows you to save a URL to Read It Later from your app.

Add the plugin much like any other:

  1. Add the ReadItLaterPlugin.h and VolumeSlider.m classes to your Plugins folder in Xcode (use “Create groups for any added folders”)
  2. Add the ReadItLaterPlugin.js file to your www folder
  3. Add the ReadItLaterPlugin.js to your html file. eg:<script type="text/javascript" charset="utf-8" src="ReadItLaterPlugin.js"></script>
  4. Add the plugin to the PhoneGap.plist under Plugins (key: “ReadItLaterPlugin” value: “ReadItLaterPlugin”)

Next, get the Read It Later API iPhone Library and add it to your project:

  1. Download the library from Read It Later
  2. Unzip the library and examples
  3. Copy these four files into your Xcode project under the Plugins folder (again, use “Create groups for any added folders”)
    • ReadItLaterLite.h
    • ReadItLaterLite.m
    • ReadItLaterFull.h
    • ReadItLaterFull.m
  4. Get an API Key from Read It Later for your app
  5. Add your shiny new API key to the top of the ReadItLaterLite.m file you copied in above
    • static NSString *apikey = @"<api key here>";
  6. Add the name of your app (as you entered it to get your API key above) as well
    • static NSString *nameOfYourApp = @"<name of your app here>";

Finally, call the saveToReadItLater() method using a success callback and an object containing a url and a title:

Example

function onDeviceReady()
{
    var readItLaterPlugin = window.plugins.readItLaterPlugin;
    readItLaterPlugin.saveToReadItLater(
        function(){
            console.log("Successfully saved to Read It Later");
        }, 
        { 
            url: "http://github.com/devgeeks", 
            title: "Devgeeks on GitHub"
        }
    );
}