A dynamic method name (Objective-C)

问题

I have several methods, like below:

- (void)methodA;
- (void)methodB;
- (void)methodC;

and they are used depending on some conditions.

Now I want to dynamically use them, and I tried this:

NSString *methodName;
if(_flag == A) methodName = @"methodA";
else if (_flag == b) methodName = @"methodB";
else methodName = @"methodC";

[self performSelector:@selector(methodName)];

but it seems wrong.

So how should I use a dynamic method name for a given receiver depending on different situations?

Thanks a lot!

回答1:

Use this instead:

[self performSelector:NSSelectorFromString(methodName)]

回答2:

why don't you do in this manner??

if(_flag == A)
     [self performSelector:@selector(methodA)];
else if (_flag == b) 
     [self performSelector:@selector(methodB)];
else 
     [self performSelector:@selector(methodC)];

As the @selector needs function to call and not NSString.

来源：https://stackoverflow.com/questions/9138717/a-dynamic-method-name-objective-c