The OC SEL type of problem

SEL type mean? What is the role? The best example to the younger brother to talk about.
In addition, typedef void (^ ASIBasicBlock) (void); phrase mean? ^ This number is used to do? Also give the best example to illustrate this.
In this first thanked
Reply:
How nobody? Do I send the wrong time?
Reply:
SEL type value passed is @ selector (method name), you can hook it to be understood as a method to find the corresponding method by method name.

^ This symbol is Block. You can go online to search for a specific look at Block usage.
Reply:

reference to the second floor of the reply:

value

SEL type passed is @ selector (method name), you can hook it to be understood as a method by method name to find the corresponding method.

^ This symbol is Block. You can go online to search for a specific look at Block usage.

Oh, thank you
Reply:
Solving ah
Reply:

references, 4th Floor reply:

solve ah

Also solve Shaa, said the second floor
Reply:
Use it, directly to him as the method name you want to use, such as when the trigger button click method - this time gave him one this, as on the second floor to say, then you implement this method can be a ~