| 方法 | 问题或行为 |
| -(BOOL) isKindOfClass : class-object | 对象是不是class-object或其子类的成员 |
| -(BOOL) isMemberOfClass:class-object | 对象是不是class-object的成员 |
| -(BOOL) respondsToSelector:Selector | 对象是否能够响应selector所指定的方法 |
| -(BOOL) instancesRespondToSelector | 指定的类实例是否能响应selector |
| -(BOOL) isSubclassOfClass:class-object | 对象是否是指定类的子类 |
| -(id) performSelector:selector | 应用selector指定的方法 |
| -(id) performSelector:selector withObject:object | 应用selector指定的方法 |
| -(id) performSelector:selector withObject:object1 withObject : object2 | 应用selector指定的方法 |
测试实验设计
继承关系图：
Rectangle.h
Square.h
在main.h中的测试如下：
//
// main.m
// Square
//
// Created by Apple on 2017/9/9.
// Copyright 2017年 Apple. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Square.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
Square *mySquare = [[Square alloc] init];
//isMemberof
if( [mySquare isMemberOfClass:[Square class]] == YES )
{
NSLog(@" mySquare is a member of Square class ");//
}
if( [mySquare isMemberOfClass:[Rectangle class]] == YES )
{
NSLog(@"mySquare is s member of Rectamgle class");
}
if([mySquare isMemberOfClass:[NSObject class]] == YES)
{
NSLog(@"mySquare is a member of NSObject class");
}
//isKindOf
if( [mySquare isKindOfClass:[Square class]] == YES )
{
NSLog(@" mySquare is a kind of Square class ");//
}
if( [mySquare isKindOfClass:[Rectangle class]] == YES )
{
NSLog(@"mySquare is s kind of Rectamgle class");
}
if([mySquare isKindOfClass:[NSObject class]] == YES)
{
NSLog(@"mySquare is a kind of NSObject class");//
}
//respondsTo:
if( [mySquare respondsToSelector:@selector(setSide:)] == YES )
{
NSLog(@" mySquare responds to setSide : method ");
}
if( [mySquare respondsToSelector:@selector(setWidth:addHeight:)] == YES )
{
NSLog(@"mySquare responds to setWidth:addHeight : method");
}
if([Square respondsToSelector:@selector(alloc)] == YES)
{
NSLog(@"Square class responds to alloc method");
}
//instancesRespondTo:
if( [Rectangle instancesRespondToSelector:@selector(setSide:)] == YES )
{
NSLog(@"Instances of respond to setSide : method");
}
if( [Square instancesRespondToSelector:@selector(setWidth:addHeight:)] == YES )
{
NSLog(@"Instances of Square respond to setWidth:addHeight: : method");
}
if([Square isSubclassOfClass:[Rectangle class]] == YES)
{
NSLog(@"Square is a subclass of a rectangle");
}
return 0;
}
}
