rutime中动态调用类的方法

Dynamically invoke a class method in Objective C

代码

#import <Foundation/Foundation.h>
#import "A.h"

@implementation A

- (NSString *)description
{
    return [NSString stringWithString: @"A"];
}

+ (NSString *)action
{
    return [NSString stringWithString:@"A::action"];
}

@end

方法执行

A *a = [[A class] performSelector:@selector(action)];