This is a CocoaPod that can be used for simple sentiment analysis of an English text. Sentiment analysis aims to determine the attitude of a speaker or a writer with respect to some topic or the overall contextual polarity of a text. Simply put it tells you whether the text is "happy" or "sad".
For instance "It was a good sunny day" will score 2.0 points, meaning it is a positive text and "It was rainy and cold day" will be graded as negative.
Install using CocoaPods.
pod SKPolygraph
Include SKPolygraph in your code
#include "SKPolygraph.h"
Sample usage to get sentimental score for text
float score = [[SKPolygraph sharedInstance] analyseSentiment:@"It was cold and rainy."];
You can also analyse a single word. For that you need to #include "SKWord.h". Use it like this:
SKWord *word = [[SKPolygraph sharedInstance] analyseSentimentOfWord:@"cold"];
See sample project unit tests for more examples.
The dictionary used for analysis is taken from http://www.cs.uic.edu/~liub/FBS/sentiment-analysis.html thus it is very basic, providing only negative -1.0 and positive 1.0 values.
In future versions I plan to use more complex dictionaries with more gradation of values.