#import <Foundation/Foundation.h>

#import "ClassA.h"http://新建a是NSObecjt的子類,b是a的子類
#import "ClassB.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
    //構建類名，構建的都是ClassA
        Class className = NSClassFromString(@"ClassA");
        
        Class className2 = [ClassA class];
        
        //1.查看某個對象是否是某個類的對象
        
        ClassB *b = [[ClassB alloc]init];
        
        BOOL isYes1 = [b isMemberOfClass:[ClassB class]];
        
        BOOL isYes2 = [b isMemberOfClass:[ClassA class]];
        
        NSLog(@"b%@ClassB的對象",isYes1?@"是":@"不是");
                                            //,出錯三目運算法 要是? -> :
        
        NSLog(@"b%@ClassA的對象",isYes2?@"是":@"不是");
        
        //2.查看某個對象是否是某個類的派生對象 -》b是否是B的或B的父類的對象
        
        BOOL isYes3 = [b isKindOfClass:[ClassB class]];
        
        BOOL isYes4 = [b isKindOfClass:[ClassB class]];
        
        NSLog(@"b%@ClassB的派生對象",isYes3?@"是":@"不是");
        
        NSLog(@"b%@ClassA的派生對象",isYes4?@"是":@"不是");
    
    }
    return 0;
}

2016-01-18 19:00:02.531 Foundation 對象與類的關系[3854:595807] b是ClassB的對象
2016-01-18 19:00:02.533 Foundation 對象與類的關系[3854:595807] b不是ClassA的對象
2016-01-18 19:00:02.533 Foundation 對象與類的關系[3854:595807] b是ClassB的派生對象
2016-01-18 19:00:02.533 Foundation 對象與類的關系[3854:595807] b是ClassA的派生對象
Program ended with exit code: 0