ARC
Influencing ARC
deinit{} //the time out of heap
- 還是不懂為什么closures里 self變量會(huì)被保留
Extensions
meanings: extensions allow u to add methods and properties to other classes even if you don`t have the source code to the other classes
eg: you can add it to classes in UIkit
Protocols
it gives the heart of what the API contract is between things.
its really talking about , the methods and functions i expect you to
to implement if you`re gonna work with with me
Delegation
it has a demo in L08 , Cassini
UIScrollView
And there lots to do if it really work
