详解如何使用ReactiveObjC

编辑: admin 分类: ios开发 发布时间: 2021-12-12 来源:互联网
目录
  • 概述
  • 基本使用
    • 1、基本控件
    • 2、监听属性变化
    • 3、遍历数组和字典
    • 4、监听 Notification 通知事件
    • 5、代替Delegate代理
  • 二、RAC常用类
    • 三、高级函数使用
      • 1、连接信号、合并信号等
      • 2、flattenMap & map 映射
      • 3、filter -- 过滤、ignore -- 忽略、distinctUntilChanged -- 忽略相同

    概述

    RAC架构框架图

    信号流程

    基本使用

    1、基本控件

    UITextField

    //监听文本输入
     [[_textField rac_textSignal] subscribeNext:^(NSString * _Nullable x) {
            NSLog(@"%@",x);
     }];
      
     
    //可根据自己想要监听的事件选择
     [[_textField rac_signalForControlEvents:UIControlEventEditingChanged] subscribeNext:^(__kindof UIControl * _Nullable x) {
         NSLog(@"%@",x);
     }];
    //添加条件 -- 下面表示输入文字长度 > 10 时才会调用subscribeNext
     [[_textField.rac_textSignal filter:^BOOL(NSString * _Nullable value) {
         return value.length > 10;
     }] subscribeNext:^(NSString * _Nullable x) {
         NSLog(@"输入框内容:%@", x); }];
    

    UIButton

    //监听按钮点击事件
    [[_btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
            NSLog(@"-->%@",x);
    }];

    计时器(interval、delay)

    //类似timer
    @weakify(self)
    self.disposable = [[RACSignal interval:2 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSDate * _Nullable x) {
            @strongify(self)
            NSLog(@"时间:%@", x); // x 是当前的时间
            //关闭计时器
            [self.disposable dispose];
    }];
    //延时
    [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            [subscriber sendNext:@"延时2秒"];
            return nil;<br>}] delay:2] subscribeNext:^(id x) {
             
            NSLog(@"-->%@",x);
    }];

    2、监听属性变化

    //监听self的name属性
    [RACObserve(self, name) subscribeNext:^(id  _Nullable x) {
            NSLog(@"属性的改变-->%@",x);
    }];
    [[self rac_valuesForKeyPath:@"name" observer:self] subscribeNext:^(id  _Nullable x) {
            NSLog(@"属性的改变-->%@", x);
    }];
    //此处RAC宏相当于让_label订阅了_textField的文本变化信号
    //赋值给label的text属性
    RAC(_label, text) = _textField.rac_textSignal;

    3、遍历数组和字典

    //遍历数组
     NSArray *array = @[@"1", @"2", @"3", @"4", @"5"];
    [array.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
          NSLog(@"内容-->%@", x)<br>}];

    4、监听 Notification 通知事件

    [[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"notification" object:nil] subscribeNext:^(NSNotification * _Nullable x) {
            NSLog(@"-->%@", x);
    }];

    5、代替Delegate代理

    //监听按钮点击方法的信号
    //当执行完btnClickAction后会执行此订阅
    [[self rac_signalForSelector:@selector(btnClickAction:)] subscribeNext:^(RACTuple * _Nullable x) {
            NSLog(@"-->%@", x);
    }];
    -(void) btnClickAction:(UIButton *)btn
    {
        NSLog(@"按钮点击");
    }

    二、RAC常用类

    RACSignal

    RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
          [subscriber sendNext:@"🍺🍺🍺🍺🍺🍺🍺"];
          [subscriber sendCompleted];
          return [RACDisposable disposableWithBlock:^{
              NSLog(@"销毁了🍺🍺🍺");
          }];
      }];
      [signal subscribeNext:^(id  _Nullable x) {
          NSLog(@"%@",x);
      }];

    RACSubject(可发送信号也可以订阅信号)

    RACTuple(元组)-- 其内部就是封装了数组,用起来跟数组差不多

    //通过定值创建RACTuple
    RACTuple *tuple = [RACTuple tupleWithObjects:@"1", @"2", @"3", nil];
    //利用 RAC 宏快速封装
    RACTuple *tuple2 = RACTuplePack(@"1", @"2", @"3");
    //从别的数组中获取内容
    RACTuple *tuple3 = [RACTuple tupleWithObjectsFromArray:@[@"1", @"2", @"3"]];
     
    NSLog(@"元组-->%@", tuple3[0]);
    NSLog(@"第一个元素-->%@", [tuple3 first]);
    NSLog(@"最后一个元素-->%@", [tuple3 last]);

    RACMulticastConnection -- 用于当一个信号,被多次订阅时,为了保证创建信号时,避免多次调用创建信号中的block

    RACSignal *signal1 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
           [subscriber sendNext:@"signal1-->🍺🍺🍺🍺🍺🍺🍺"];
           [subscriber sendCompleted];
           return [RACDisposable disposableWithBlock:^{
               NSLog(@"signal1销毁了");
           }];
       }];
        
       RACMulticastConnection *connection = [signal1 publish];
        
       [connection.signal subscribeNext:^(id  _Nullable x) {
           NSLog(@"subscribeNext-->1");
       }];
       [connection.signal subscribeNext:^(id  _Nullable x) {
           NSLog(@"subscribeNext-->2");
       }];
       [connection.signal subscribeNext:^(id  _Nullable x) {
           NSLog(@"subscribeNext-->3");
       }];
       [connection connect];

    RACCommand -- 可以监听信号的状态等

    NSString *input = @"执行";
    RACCommand *command = [[RACCommand alloc] initWithSignalBlock:^RACSignal * _Nonnull(id  _Nullable input) {
        NSLog(@"input-->%@",input);
        return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
            [subscriber sendNext:@"🍺🍺🍺🍺🍺🍺🍺"];
            [subscriber sendError:[NSError errorWithDomain:@"error" code:-1 userInfo:nil]];
    //            [subscriber sendCompleted];
            return [RACDisposable disposableWithBlock:^{
                NSLog(@"signal销毁了");
            }];
        }];
    }];
    [command.executionSignals subscribeNext:^(RACSignal   * _Nullable x) {
        NSLog(@"executionSignals-->%@",x);
        [x subscribeNext:^(id  _Nullable x) {
            NSLog(@"executionSignals-->subscribeNext-->%@",x);
        }];
    }];
    [[command.executionSignals switchToLatest] subscribeNext:^(id  _Nullable x) {
        NSLog(@"switchToLatest-->%@",x);
    }];
    [command.executing subscribeNext:^(id  _Nullable x) {
        NSLog(@"executing-->%@",x);
    }];
    [command.errors subscribeNext:^(id  _Nullable x) {
        NSLog(@"errors-->%@",x);
    }];
    //开始执行
    [command execute:input];

    三、高级函数使用

    1、连接信号、合并信号等

    首先创建两个信号signal1和signal2来演示

    RACSignal *signal1 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
         [subscriber sendNext:@"signal1-->🍺🍺🍺🍺🍺🍺🍺"];
         [subscriber sendCompleted];
         return [RACDisposable disposableWithBlock:^{
             NSLog(@"signal1销毁了");
         }];
     }];
     RACSignal *signal2 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
         [subscriber sendNext:@"signal2-->🍺🍺🍺🍺🍺🍺🍺"];
         [subscriber sendCompleted];
         return [RACDisposable disposableWithBlock:^{
             NSLog(@"signal2销毁了");
         }];
     }];

    1.1、 concat -- 当多个信号发出的时候,有顺序的接收信号

    一个信号signal3去监听signal1和signal2,必须是接收signal1完后才会接收signal2

    RACSignal *signal3 = [signal1 concat:signal2];
      [signal3 subscribeNext:^(id  _Nullable x) {
          NSLog(@"signal3-->%@",x);
      }];

    1.2、 combineLatestWith -- 将多个信号合并起来,并且拿到各个信号的最新的值,必须每个合并的signal至少都有过一次sendNext,才会触发合并的信号(订阅者每次接收的参数都是所有信号的最新值),不论触发哪个信号都会触发合并的信号

    一个信号signal3去监听signal1和signal2,每次回调两个信号的最新值

    RACSignal *signal3 = [signal1 combineLatestWith:signal2];
       [signal3 subscribeNext:^(id  _Nullable x) {
           NSLog(@"%@",x);
       }];

    PS:注释signal1的sendNext方法,直接销毁了,所以每个singal必须有sendNext方法

    1.3、 then -- 用于连接两个信号,等待第一个信号完成,才会连接then返回的信号

    RACSignal *signal3 = [signal1 then:^RACSignal * _Nonnull{
        return signal2;
    }];
    [signal3 subscribeNext:^(id  _Nullable x) {
        NSLog(@"signal3-->%@",x);
    }];

    1.4、 merge -- 把多个信号合并为一个信号来监听,任何一个信号有新值的时候就会调用

    一个信号signal3去监听signal1和signal2,每次回调一个信号

    RACSignal *signal3 = [signal1 merge:signal2];
    [signal3 subscribeNext:^(id  _Nullable x) {
        NSLog(@"signal3-->%@",x);
    }];

    1.5、 zipWith -- 把两个信号压缩成一个信号,只有当两个信号都发出信号内容时,才会触发

    一个信号signal3去监听signal1和signal2,但必须两个信号都有发出(不需要同时,例如signal1信号发出了,signal2信号等了10秒之后发出,那么signal3的订阅回调是等signal2信号发出的那一刻触发)

    RACSignal *signal3 = [signal1 zipWith:signal2];
    [signal3 subscribeNext:^(id  _Nullable x) {
        NSLog(@"signal3-->%@",x);
    }];

    1.6、 reduce 聚合 -- 把多个信号的值按照自定义的组合返回

    RACSignal *signal3 = [RACSignal combineLatest:@[signal1,signal2] reduce:^id(NSString *s1 ,NSString *s2){
        return [NSString stringWithFormat:@"%@ %@",s1,s2];
    }];
    [signal3 subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];

    2、flattenMap & map 映射

    flattenMap 的底层实现是通过bind实现的

    map 的底层实现是通过 flattenMap 实现的

    //map事例
    [[_textField.rac_textSignal map:^id _Nullable(NSString * _Nullable value) {
            return [NSString stringWithFormat:@"%@🍺🍺🍺🍺🍺🍺🍺",value];
        }] subscribeNext:^(id  _Nullable x) {
            NSLog(@"-->%@",x);
        }] ;
    //flattenMap事例
     [[_textField.rac_textSignal flattenMap:^__kindof RACSignal * _Nullable(NSString * _Nullable value) {
            return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
                [subscriber sendNext:[NSString stringWithFormat:@"%@🍺🍺🍺🍺🍺🍺🍺",value]];
                [subscriber sendCompleted];
                return [RACDisposable disposableWithBlock:^(){}];
            }];
        }] subscribeNext:^(id  _Nullable x) {
            NSLog(@"-->%@",x);
        }] ;

    3、filter -- 过滤、ignore -- 忽略、distinctUntilChanged -- 忽略相同

    filter、ignore

    //map事例
    [[_textField.rac_textSignal map:^id _Nullable(NSString * _Nullable value) {
            return [NSString stringWithFormat:@"%@🍺🍺🍺🍺🍺🍺🍺",value];
        }] subscribeNext:^(id  _Nullable x) {
            NSLog(@"-->%@",x);
        }] ;
    //flattenMap事例
     [[_textField.rac_textSignal flattenMap:^__kindof RACSignal * _Nullable(NSString * _Nullable value) {
            return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
                [subscriber sendNext:[NSString stringWithFormat:@"%@🍺🍺🍺🍺🍺🍺🍺",value]];
                [subscriber sendCompleted];
                return [RACDisposable disposableWithBlock:^(){}];
            }];
        }] subscribeNext:^(id  _Nullable x) {
            NSLog(@"-->%@",x);
        }] ;

    distinctUntilChanged

    RACSubject *subject = [RACSubject subject];
       [[subject distinctUntilChanged] subscribeNext:^(id  _Nullable x) {
           NSLog(@"-->%@",x);
       }];
       [subject sendNext:@"123"];
       [subject sendNext:@"123"];
       [subject sendNext:@"123"];
       [subject sendNext:@"🍺🍺🍺🍺🍺🍺"];
       [subject sendNext:@"🍺🍺🍺🍺🍺🍺"];
       [subject sendCompleted];

    以上就是详解如何使用ReactiveObjC的详细内容,更多关于如何使用ReactiveObjC的资料请关注海外IDC网其它相关文章!

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