some techniques in this project 2016 0817.md

some techniques in this project

1 singleton

A kind of design pattern used for implementing a global accessible instance that saves time(lazy instantiation), buffering or other functions.

2 protocol (swift)

like interface in Java

3 delegate(swift)

UI technique

4 closure(swift)

a function is a special closure.

5combining object-C and swift, using third-party lib

both object-C and swift are object-oriented, and therefore they are compatible in the OO layer. Though having different grammar, object-C and swift are able to use the code and object of each other. Consequently, we are able to use third-party lib written in object-C or swift