If you want to add AWS services into your existing application then you can by two different way:
1) CocoaPods
2) Frameworks
I am going to explain here only using cocoapods.
To start you need cocoapods in your machine, if it does not then you can installed it by running command in the terminal.
$ sudo gem install cocoapods
Then run the following code.
$ pod install
To install the cocoapods you can also follow some tutorials. Over the google you can find many more.
Now open up *.xcworkspace with Xcode and start using the SDK.
You have to first purchase AWS account access and get these credentials :
accountId:@“xxxxxxxx”
identityPoolId:@”xxxxxxxx-xxxxxxxx”
unauthRoleArn:@”xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx“
I have created sample which I uploaded on cloud. Please download using below link and start exposure.
https://drive.google.com/file/d/0BxT2bDKJPoY0MmJTc3E3dmtiZEk/view?usp=sharing