ReactiveCocoa 使用

源代碼地址 https://github.com/Liuchunqi3240/demo/tree/master/ReactiveCocoaTour

目錄

  • [self textFiledUse];

  • [self buttonUse];

  • [self skip];

  • [self distinctUntilChanged];

  • [self take];

  • [self takeLast];

  • [self takeUntil];

  • [self switchToLatest];

  • [self doNextAndDoComplete];

  • [self deliverOn];

  • [self subscribOn];

  • [self interval];

  • [self timeOut];

  • [self delay];

  • [self retry];

  • [self replay];

  • [self throttle];

  • [self sequence];

  • [self notificationUse];

  • [self KVO];

cocoapods 安裝


target 'ReactiveCocoaTour' do

pod 'ReactiveObjC'


end

代碼使用

import

#import "ReactiveObjC.h"

textfiled

//textfiled 用法
- (void)textFiledUse{
    
    //直接檢測值的變化 壞處是 第一次無變化時也會回調
    @weakify(self);
    [self.textFiled.rac_textSignal subscribeNext:^(NSString * _Nullable x) {
        @strongify(self);
        NSLog(@"textfiled text is %@  x is %@",self.textFiled.text,x);
    }];
    //增加一個過濾條件
    [[self.textFiled.rac_textSignal filter:^BOOL(NSString * _Nullable value) {
        return [value hasPrefix:@"x"];
    }] subscribeNext:^(NSString * _Nullable x) {
        NSLog(@"x is %@",x);
    }];
    
    //過濾掉特殊字符串不進行調用
    [[self.textFiled.rac_textSignal ignore:@"sunny"] subscribeNext:^(NSString *value) {
        NSLog(@"`sunny` could never appear : %@", value);
    }];
    
    //可以有多個訂閱者 依次執行
    RACSignal *signal = self.textFiled.rac_textSignal;
    [signal subscribeNext:^(id x) {
        NSLog(@"1111");
    }];
    [signal subscribeNext:^(id x) {
        NSLog(@"2222");
    }];

}

button target

- (void)buttonUse{
    [[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        NSLog(@"button click");
    }];
}

skip

- (void)skip{
    //跳過前面兩個 skip 填寫跳過的個數
    RACSubject *subject = [RACSubject subject];
    [[subject skip:2] subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];
    [subject sendNext:@2];
    [subject sendNext:@3];
    [subject sendNext:@1];
}

distinctUntilChanged

- (void)distinctUntilChanged{
    //和上次一樣的信號 不會被訂閱
    RACSubject *subject = [RACSubject subject];
    [[subject distinctUntilChanged] subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];
    // 發送信號
    [subject sendNext:@1];
    [subject sendNext:@2];
    [subject sendNext:@2]; // 不會被訂閱

}

take

- (void)take{
    //只取前面幾個的信號 take:nsinter count
    RACSubject *subject = [RACSubject subject];
    [[subject take:2]subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    [subject sendNext:@1];
    [subject sendNext:@2];
    [subject sendNext:@3];
}

takeLast

- (void)takeLast{
    //只取后面幾個的信號 takeLast:nsinter count
    RACSubject *subject = [RACSubject subject];
    [[subject takeLast:2] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    [subject sendNext:@1];
    [subject sendNext:@2];
    [subject sendNext:@3];
}

takeUntil

- (void)takeUntil{
    //執行到 until的那個信號發出 結束  這里指subject2 發出next 或者 complete
    RACSubject *subject1 = [RACSubject subject];
    RACSubject *subject2 = [RACSubject subject];
    
    [[subject1 takeUntil:subject2] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    [subject1 sendNext:@1];
    [subject1 sendNext:@2];
    
//    [subject2 sendNext:@1];  //和下面 complete 效果相同
    [subject2 sendCompleted];
    
    [subject1 sendNext:@3];

}

switchToLatest

- (void)switchToLatest{
    //只獲取最新的信號發出的指令 前面的都釋放掉
    RACSubject *signalOfSignals = [RACSubject subject];
    RACSubject *signalA = [RACSubject subject];
    RACSubject *signalB = [RACSubject subject];
    // 獲取信號中信號最近發出信號，訂閱最近發出的信號。
    // 注意switchToLatest：只能用于信號中的信號
    [signalOfSignals.switchToLatest subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];
    [signalOfSignals sendNext:signalA];
    [signalOfSignals sendNext:signalB];
    [signalA sendNext:@"signalA"];
    [signalB sendNext:@"signalB"];
    
}

doNext doComplete

- (void)doNextAndDoComplete{
    [[[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        
        [subscriber sendNext:@"hi"];
        [subscriber sendCompleted];
        
        return nil;
    }]doNext:^(id  _Nullable x) {
        //在執行    [subscriber sendNext:@"hi"];之前先執行
        NSLog(@"do next");
    }]doCompleted:^{
        //在執行    [subscriber sendCompleted];之前先執行
        NSLog(@"do complete");
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
}

deliverOn


//內容傳遞切換到制定線程中，副作用在原來線程中,把在創建信號時block中的代碼稱之為副作用
- (void)deliverOn{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
       [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
           NSLog(@"%@",[NSThread currentThread]);
           [subscriber sendNext:@1];
           [subscriber sendCompleted];
           return nil;
       }]
        //交付給主線程
        deliverOn:[RACScheduler mainThreadScheduler] ]
        subscribeNext:^(id  _Nullable x) {
            NSLog(@"%@",x);
            NSLog(@"%@",[NSThread currentThread]);
       }];
    });
}

subscribeOn

//內容傳遞和副作用都會切換到制定線程中
- (void)subscribeOn{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
            NSLog(@"%@",[NSThread currentThread]);
            [subscriber sendNext:@"123"];
            [subscriber sendCompleted];
            return nil;
        }]
        subscribeOn:[RACScheduler mainThreadScheduler]]
        subscribeNext:^(id  _Nullable x) {
            NSLog(@"%@",x);
            NSLog(@"%@",[NSThread currentThread]);
        }];
    });
}

interval

- (void)interval{
    //定時器
    [[RACSignal interval:1.0f onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSDate * _Nullable x) {
        NSLog(@"%@",x);
    }];
}

timeOut

- (void)timeOut{
    [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        //無任何操作 等超時
//        [subscriber sendNext:@"ddsa"];
//        NSError *error = [[NSError alloc]initWithDomain:@"unknwn domain" code:600 userInfo:@{@"error":@"超時"}];
//        [subscriber sendError:error];
//        [subscriber sendCompleted];
        return nil;
    }] timeout:3 onScheduler:[RACScheduler mainThreadScheduler]]subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }error:^(NSError * _Nullable error) {
        NSLog(@"%@",error);
    }];
}

delay

- (void)delay{
    [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        NSLog(@"send next");
        [subscriber sendNext:@"delay msg"];
        [subscriber sendCompleted];
        return nil;
    }] delay:2]
        subscribeNext:^(id  _Nullable x) {
            NSLog(@"%@",x);
    }];
}

- (void)retry{
    //重試
    //不執行error block  一直到  執行send next 結束
    __block int i = 0;
    [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        if (i == 5) {
            [subscriber sendNext:@"send next"];
        }else{
            [subscriber sendError:[NSError errorWithDomain:@"unknown domain" code:600 userInfo:@{@"msg":[NSString stringWithFormat:@"%d",i]}]];
        }
        i ++;
        return  nil;
    }]
      retry]
     
     subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }error:^(NSError * _Nullable error) {
        NSLog(@"%@",error);
    }];
}

replay

- (void)replay{
    //多個訂閱者 只執行一遍副作用  沒有replay 要重復執行副作用
    RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        
        [subscriber sendNext:@1];
        [subscriber sendNext:@2];
        
        return nil;
    }] replay];
    
    [signal subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];
    
    [signal subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];
}

throttle

- (void)throttle{
    //節流 間隔1s以后 訂閱者獲取最新信號發出的指令 在1S內  sendNext都不會進subscribeBlock中
    RACSubject *subject = [RACSubject subject];
    
    [[subject throttle:1] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    [subject sendNext:@1];
    [subject sendNext:@2];
    [subject sendNext:@3];
    [subject sendNext:@4];

}

sequence

- (void)sequence{
//    遍歷數組
    NSArray *array = @[@"1",@"2",@"3",@"4",@"5",@"6"];
    
    [array.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@", x);
    }];
//    遍歷字典
    NSDictionary *dict = @{@"name":@"張旭",@"age":@24};
    [dict.rac_sequence.signal subscribeNext:^(RACTuple *x) {
        
        RACTupleUnpack(NSString *key,NSString *value) = x;
        
        NSLog(@"%@ %@",key,value);
        
    }];

    
}

notification obsever

- (void)notificationUse{
    [[[NSNotificationCenter defaultCenter]rac_addObserverForName:@"notificationName" object:nil] subscribeNext:^(NSNotification * _Nullable x) {
        NSLog(@"notificaiton is %@",x);
    }];
}

KVO

- (void)KVO{
    UIScrollView *scrolView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 200, 200, 400)];
    scrolView.contentSize = CGSizeMake(200, 800);
    scrolView.backgroundColor = [UIColor greenColor];
    [self.view addSubview:scrolView];
    [RACObserve(scrolView, contentOffset) subscribeNext:^(id x) {
        NSLog(@"success");
    }];
}
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