A simple calculator app to rival Apple's calculator.
This app has been submitted to the app store. Any person who contributes to this app, will be included in the description of the app (updated as often as possible).
The main idea is to let people looking to get iOS developer jobs a chance to say that have contributed to an app in the app store.
I spent a while testing what happens when using the calculator in different ways.
Below are a few tests : [button] display
- [3] 3 [+] 3 [5] 5 [=] 8 [=] 13 [=] 18
- [4] 4 [%] 0.04
- [3] 3 [-] 3 [1] 1 [+] 2 [4] 4 [x] 4 [3] 3 [=] 14
- [4] 4 [.] 4. [5] 4.5 [+] 4.5 [3] 3 [=] 7.5
I spent a good chunk of time trying to get it as close to working like the original app.
Here is what I was able to get working :
- math operations [+], [-], [x], [/]
- percent ... [4] 4 [%] 0.04
- signing ... [4] 4 [+/-] -4
- clear / all clear ... [4] 4 [c] 0 and [ac] clears last operation
- decimal ... [4] 4 [.] 4. [6] 4.6
- equals after operation ... [4] 4 [+] 4 [4] 4 [=] 8 [=] 12
- operation after operation ... [4] 4 [+] 4 [3] 3 [-] 7 [2] 2 [=] 5
I always get annoyed when I accidentally hit the wrong number while in the middle of a multiple step formula. So I choose to add a "delete" button that removes numbers if they have just been input. It does not delete if the display is a result.
- delete ... [4] 4 [5] 45 [del] 4 [del] 0
Specifications I wanted to follow :
- works for both 3.5 & 4 inch displays
- simple iOS 7 look with better touch and selected animations
- resizable font size for display (like the original app)
- design that will be dynamic for future ability to customize
- discover and use original font
My biggest design challenge was the font(s). Yes, that is plural. Apple uses the Helvetica Neue family for most of there thin fonts in iOS 7. But the funny thing is the decimal point in Helvetica Neue is a line, not a circle. So I went about finding a good decimal and I ended up using Avenir. The button was easy, the display was a little trickier. I setup a simple NSMutableAttributedString to solve the display issue.
I wanted to have a nerdy throwback. So I based the icon on calculator speak. When you put 1337 in a calculator and turn it upside down it spells LEEt (as in an elite nerd).
Here are the screenshots of the calculator app that I built.