给类扩展方法

#import <Foundation/Foundation.h>
#import <objc/runtime.h>
@interface RuntimeCategoryClass:NSObject
- (void)method1;
@end
@implementation RuntimeCategoryClass

- (void)method1{
    
}
@end
@interface RuntimeCategoryClass (Categroy)
- (void)method2;
@end


@implementation RuntimeCategoryClass(Categroy)

- (void)method2{
    
}

@end
void test(){

#pragma mark---
    NSLog(@"测试objc_class中的方法列表是否包含分类中得到方法");
    
    uint outcount = 0;
    
    Class cls  = RuntimeCategoryClass.class;

    Method *methodList  =class_copyMethodList(cls, &outcount);
    
    for (int i = 0 ; i<outcount; i++) {
        
        Method method = methodList[i];
        
        const char *name = sel_getName(method_getName(method));
        
        NSLog(@"RuntimeCategoryClass's method:%s",name);
        
        if (strcmp(name , sel_getName(@selector(method2)))) {
            
            NSLog(@"分类中的方法method2在objc_class的方法列表中");
        }
        
    }
    
    
 }
int main(int argc, const char * argv[]) {
    @autoreleasepool {

        test();
        
        // insert code here...
        NSLog(@"Hello, World!");
    }
    return 0;
}