OC——通知(NSNotificationCenter)基本声明方法

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        //NSNotificationCenter        //使用步骤        //1、注册通知        //2、关联监听到通知之后触发的方法        //3、发送通知        //4、触发方法执行，处理相应逻辑        //5、注册对象销毁时（dealloc），移除通知(在哪个文件注册的通知就应该在哪个文件移除观察者)//.h文件////  Bus.h//  8.03_1////  Created by rimi1 on 16/8/3.//  Copyright © 2016年 Wangxingqian. All rights reserved.//#import <Foundation/Foundation.h>@interface Bus : NSObject@property (nonatomic, strong) NSString *name;@property (nonatomic, strong) NSString *code;- (instancetype)initWithName:(NSString *)name                code:(NSString *)code;@end//.m文件////  Bus.m//  8.03_1////  Created by rimi1 on 16/8/3.//  Copyright © 2016年 Wangxingqian. All rights reserved.//#import "Bus.h"@implementation Bus- (void)dealloc{    [[NSNotificationCenter defaultCenter] removeObserver:self];}- (instancetype)init{    self = [super init];    if (self) {                _name = @"煞笔";        //1        //注册通知  addObserver:(观察者) selector:(接受到通知自动调用) name:@"name" object:nil        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(nameChange) name:@"name" object:nil];            }    return self;}- (instancetype)initWithName:(NSString *)name code:(NSString *)code {        if (self = [super init]) {                _name = name;        _code = code;            }    return self;}- (void)setName:(NSString *)name {        NSLog(@"路人乙以前的名字：%@，现在的名字：%@", _name, name);        _name = name;        //2    //发送通知(这里是当在 main 函数里面调用 name 的 set 方法时，会发送通知)    [[NSNotificationCenter defaultCenter] postNotificationName:@"name" object:nil userInfo:nil];    }//3//接受通知时调用的方法- (void)nameChange {        _code = @"123456";        NSLog(@"路人甲：智障，那我也帮你改身份证了。 身份证：%@", _code);    }@end//main函数//  main.m//  8.03_1////  Created by rimi1 on 16/8/3.//  Copyright © 2016年 Wangxingqian. All rights reserved.//#import <Foundation/Foundation.h>#import "Student.h"#import "Teacher.h"#import "Bus.h"int main(int argc, const char * argv[]) {    @autoreleasepool {                Bus *bus = [[Bus alloc] init];        bus.name = @"智障";            }    return 0;}
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