The function is called from the "iOS Learning note" Objective-c based on the function name

Source: http://blog.csdn.net/hopedark/article/details/7970370

The method of calling a function in Objective-c is "message passing", and the difference between this and a normal function call is that you can pass any message to an object at any time without having to declare the methods at compile time. So objective-c can pass the message at runtime.

The main use:sel and @selector, and of course Performselector

See Example:

First three functions:

[CPP]View Plaincopy < param name= "wmode" value= "Transparent" >

1. -(void) CallBack0
2. {
3. NSLog (@"CallBack0");
4. }
6. -(void) CallBack1: (int) a
7. {
8. NSLog (@"callback1:a=%i", a);
9. }
11. -(void) CallBack2: (int) a B: (int) b
12. {
13. NSLog (@"callback2:a=%i,b=%i", b);
14. }

Performselector Call:

[CPP]View Plaincopy

1. [Self performselector: @selector (CallBack0)];
2. [Self performselector: @selector (CallBack1:) withobject:1];
3. [Self performselector: @selector (callback2:b:) withobject:1 withobject:2];

Dynamic invocation According to the name of the function:

[CPP]View Plaincopy < param name= "wmode" value= "Transparent" >

1. NSString *[email protected]"CallBack0";
2. SEL faselector=nsselectorfromstring (a);
3. [Self performselector:faselector];
5. NSString *[email protected]"CALLBACK1:";
6. SEL fbselector=nsselectorfromstring (b);
7. [Self performselector:fbselector withobject:1];
9. NSString *[email protected]"CALLBACK2:B:";
10. SEL fcselector=nsselectorfromstring (c);
11. [Self performselector:fcselector withobject:1 withobject:2];

This allows the function to be called according to the function name!

iOS Learning notes objective-c calling functions based on function name