Fonts and colors, colors and fonts
When creating or thinking about a new iOS app it's always good to think the design through. Because let's be honest, there are so many apps in the AppStore (in July 2014 estimated at 1.2 million apps even!) that an app with a great design makes a big difference on whether an user will download your app or another app thats similar. Think about it, with 1.2 million apps in there, chances are quite high that no app (stays) unique.
A nice program to use when thinking of an design for your app could be Sketch3:
When working on my school project we had to make some decisions on the UI. In the first release it was all focused about the functionality and you can clearly see that. In the second release we focused a bit more on the design. See for yourself:


Typography
The kind of font you use in your app plays a big part. Xcode offers you a list of preinstalled fonts, which you can find here: http://iosfonts.com
If you don't see a font you like, you could also add your own custom font by downloading a free .ttf font.
Hit Targets
In order for your users to be able to hit targets successfully in your app, you should keep in mind that those targets (for ex. an uibutton) should at least be 44x44pointsAlignment
Alignment is such an important part to a nice design as a nicely aligned design is easier for the eye to see. Since an user's eye moves from left to right, up to down you have to make sure the hierarchy in your app is right.
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