THE BITESITE BLOG
Reactnativeallwoarbitraryloads

React Native fetch only working with localhost and NOT IP addresses

software coding

Alright, this will be a quick one. So I was using 'fetch' to make a web request in my React Native app. My server was a Rails app. When I used 'localhost' in my request, the request would work perfectly, but if I used my IP address, the network request would fail.

fetch('localhost:3000')   /* this would work fine */
fetch('192.168.1.41:3000')    /* this would not work */

I double-checked to make sure my Rails server wasn't the issue and ensured it was bound to 0.0.0.0

rails s -b 0.0.0.0

So that was good. In fact, if I went into my iOS simulator and launched Safari, Safari could hit the localhost:3000 and IP Address:3000 no problem. So my iOS Simulator could hit my Rails app, but not my React Native app using the IP Address. Again, everything worked fine using localhost.

Turns out this is an iOS 9 issue where by default, HTTP requests are blocked (vs HTTPS requests). So to allow this you need to enable "Allow Arbitrary Loads" in your Info.plist in your XCode project.

For more details, check out this link https://facebook.github.io/react-native/docs/running-on-device-ios.html#app-transport-security

Caseyli
Casey Li
CEO & Founder, BiteSite
3dwireframesaftereffects

Creating 3D line objects using After Effects and C4D lite

after effects motion graphics film

Creating true 3D objects inside After Effects became possible with the addition of the Cinema 4D Lite application. C4D Lite was added to the 2014.1 release of After Effects CC. With C4D lite being shipped along with AE, users who have never even considered working with a 3D program like C4D now have access to it. It's right there at your fingertips... you gotta check it out!

In one of BiteSite's recent projects, I was able to take advantage of the 3D capabilities C4D offers. In this post we'll focus on a unique look you can create inside AE with 3D objects from C4D. It's so simple and quick you may have already thought this up on your own! It's something that not only adds a new look, but may also add more functionality to your project. Check it out...

Apply these 2 effects (in this order) to the 3D layer inside AE:

  1. Find Edges --> for the look we're after, click the 'invert' option
  2. Unmult --> this is not an effect that comes with AE. It's free though and you can download it here: http://www.redgiant.com/downloads/legacy-versions/

What do these effects do?

  1. Find Edges --> It finds the edges... ;) Perhaps a little self-explanatory, perhaps not! Find edges looks at any shape, image, or object (whatever type of layer you apply it to) and recognizes all of the 'edges' in that layer. Edges are any part of the image where there is a significant transition. It then turns to white everything in the layer that is not an 'edge'. Checking off 'invert' on the effect turns everything to black rather than white.
  2. Unmult --> makes 100% black areas of an image completely transparent, and leaves 100% white areas completely opaque. Everything in between adjusts accordingly. Unmult is effectively creating an alpha channel for an image that doesn't actually have one. Awesome!

Apply these two effects, and you now have a 3D line object! You can choose to have it transparent or opaque (just toggle on/off the unmult effect).

No effects added:

Find Edges:

Find edges + Unmult:

This look can be great if, -- you want that sketched art look (try adding the 'turbulent displace' effect to further this look), -- you just want fresh and simple lines instead of heavy 3D objects, -- or even just for the added functionality you get by having your 3D objects transparent!

As well, try duplicating your 3D object layer and keep it placed directly above it's duplicate in the composition panel. Have one layer with the effects applied and one without!

Try it out! If you're reading this and you use this method, leave a comment below with a link to your video We'd love to see your work. Cheers :)

Tim

Timclark
Tim Clark
Filmmaker, BiteSite
Bangoperators

Careful with Bang Operators in your Rails Models and ActiveRecord Callbacks (Frozen String error)

ruby on rails software coding

Alright here's a weird one that would have been easy to solve if I thought more about how Ruby works (and how it's not like Java:)).

So here was the issue, we were looping through a set of keys on a hash. Now, you should know that the keys on this hash were strings. So we had something like this

my_hash = {"color" => "blue", "size" => "medium" }

Now, on top of that we had a model that we'll call Person that had a "name" attribute and looked something like this:

class Person < ActiveRecord::Base
  before_validation upcase_name

  private
    def upcase_name
      name.upcase!
    end
end

Ok, for those who don't know, the bang version of upcase, upcase!, uppercases a string in place - it modifies the actual string itself.

So here is the setup, we were looping through keys of the hash:

my_hash.keys.each do |name|
  ...
end

Now, first thing to know is that you CAN'T modify a key in a hash. Anytime you try to modify the keys of a hash, you get an error. So something like this would produce an error:

my_hash.keys.each do |name|
  name.upcase!    # produces frozen string error
end

That all makes sense.

What we were surprised to see was that the following code also produces a similar error:

my_hash.keys.each do |name|
  Person.create(name: name)    # produces frozen string error
end

What's going on here? Well it turns out that the "before_validation" callback tries to upcase the name. But unlike languages like Java, the string that is passed in is the exact same object that exists in the "my_hash.keys" array. (I'm purposely avoiding by-value and by-reference wording here, because I feel it can lead to confusion)

So the hash holds a frozen lock on that string, and then when that string gets passed into the Person constructor, and the callback tries to modify it - you get the frozen string error.

How do you fix it? Change your callback:

class Person < ActiveRecord::Base
  before_validation upcase_name

  private
    def upcase_name
      name = name.upcase
    end
end

This version doesn't modify the original string but rather produces a new string.

Special thanks to d3chapma for helping me figure this one out. Check out his Gist here for more info.

Hope this helps out some peeps!

Caseyli
Casey Li
CEO & Founder, BiteSite
Reactnativeenv

React Native Env 'cannot read property get of undefined'

react native software coding

Alright, in my continuing effort to use React Native, I keep running into little issues with all the libraries I use. Usually it's due to a setup issue and my lack of understanding of the true under-workings of what I'm doing seems to lead to these issues.

Today, it's with react-native-env. When setting this library up, I kept running into an issue that would say 'cannot read property get of undefined' or 'cannot read property getAll of undefined'.

When I started debugging, it seemed the EnvironmentManager object was present, so what was the issue.

If you look at your

node_modules\react-native-env\index.js

you'll see that the get and getAll methods are delegating it to some native code:

RNEnvironmentManagerIOS.get
RNEnvironmentManagerIOS.getAll

So it's really just an issue of not reading the instructions properly. You need to add the RNEnvironmentManagerIOS.h and .m files to your project.

The only thing I found a little misleading is you shouldn't add the folder - rather add the individual files.

So in XCode, (I have a group called 'Libraries' under my project, but I think you can add it anywhere), right-click and "Add files to ", and make sure to select the individual RNEnvironmentManagerIOS.m and RNEnvironmentManagerIOS.h files.

Hope that helps out some peeps!

Caseyli
Casey Li
CEO & Founder, BiteSite
Reactnativevectoricons

React Native Vector Icons getImageForFont issue

react native software coding

So recently, I've been diving into React Native and running into all these little quirks. Luckily, it seems to be getting better day by day in terms of setup. I can say this though, as a Web Developer, this is my most successful attempt and writing mobile apps (after trying Objective-C, then Swift).

Today, I thought I'd post an small issue I ran into in trying to get react-native-vector-icons to work. The error message that would pop up on screen was

getImageForFont issue

It was a pretty simple fix. In Xcode, in your project, find your Info.plist. Then check the "Fonts provided by application" (if it's not there, you'll have to add it). Once added, make sure all your fonts are added to this property. So add Entypo.ttf, FontAwesome.ttf etc.

After that, it should work.

Hope this helps out some peeps.

Caseyli
Casey Li
CEO & Founder, BiteSite