UIKit框架之NSObject

Love The Way You Lie 2022-03-31 16:36 205阅读 0赞

首先学习NSObject

//
    //  ViewController.m
    //  localization
    //
    //  Created by City--Online on 15/5/15.
    //  Copyright (c) 2015年 XQB. All rights reserved.
    //
    
    #import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        //NSObject内包含 alloc、init方法
        NSObject *obj=[[NSObject alloc]init];
        //父类
        NSLog(@"superClass: %@",[obj superclass]);
        //当前类
        NSLog(@"Class: %@",[obj class]);
        //copy
        NSLog(@"copy: %@",[NSObject copy]);
        //hash
        NSLog(@"hash:%ld",[obj hash]);
        //description
        NSLog(@"description: %@",[obj description]);
        //debugDescription
        NSLog(@"debugDescription: %@",[obj debugDescription]);
    //    - (id)performSelector:(SEL)aSelector;
    //    - (id)performSelector:(SEL)aSelector withObject:(id)object;
    //    - (id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2;
        [self performSelector:@selector(test)];
        //isProxy
        BOOL isProxy=[obj isProxy];
        NSLog(@"isProxy: %d",isProxy);
        
    //    - (BOOL)isKindOfClass:(Class)aClass;
    //    - (BOOL)isMemberOfClass:(Class)aClass;
    //    - (BOOL)conformsToProtocol:(Protocol *)aProtocol;
    //    - (BOOL)respondsToSelector:(SEL)aSelector;
        
        //来确定一个对象是否是一个类的成员，或者是派生自该类的成员
        BOOL isKindOfClass=[obj isKindOfClass:[NSObject class]];
        NSLog(@"isKindOfClass:%d",isKindOfClass);
        
        //只能确定一个对象是否是当前类的成员
        BOOL isMemberOfClass=[obj isMemberOfClass:[NSObject class]];
        NSLog(@"isMemberOfClass:%d",isMemberOfClass);
        
        //是用来检查对象是否实现了指定协议类的方法
        BOOL IsConformsToProtocol=[obj conformsToProtocol:@protocol(UIApplicationDelegate)];
        NSLog(@"IsConformsToProtocol: %d",IsConformsToProtocol);
        
        //用来判断是否有以某个名字命名的方法(被封装在一个selector的对象里传递)
        BOOL isRespondsToSelector=[obj respondsToSelector:@selector(hash)];
        NSLog(@"isRespondsToSelector:%d",isRespondsToSelector);
        
        // selector 用来判断实例是否有以某个名字命名的方法. 和上面一个不同之处在于, 前面这个方法可以用在实例和类上，而此方法只能用在类上
        BOOL isInstancesRespondToSelector=[NSObject instancesRespondToSelector:@selector(hash)];
        NSLog(@"isInstancesRespondToSelector:%d",isInstancesRespondToSelector);
        
       
    }
    -(void)test
    {
        NSLog(@"test");
    }
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end

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[151812484237172.jpg]: /images/20220331/dc145fa1ad914262949a4c3be5a30b29.png