If you are like me (a crazy iOS and mobile developer that can’t really draw), then you are either looking for someone to draw for you or buying things like cool icons. For a few of my apps I have used Glyphish. Glyphish makes some great icons for iOS. These are distributed in a couple of sizes for use with your iphone and ipad sizing and are thin like most everything since iOS 7.
The icons come in different bundles and are a great value since you get a ton of high quality icons all separated out by category and ready to be used in your app.
Above is a snippet of some icons from the iOS 8 bundle. Announced just recently is the new Watchkit bundle which comes with icons for use on the Apple Watch and come specially made for the 38mm and 42mm screen sizes.
I am always looking for great resources for app development and I have been relying on Glyphish for icons for many years and several apps now. Have a look at what they have and I think you will agree.