IOS RAC-初级用法

1. 创建信号

    //1:创建信号
    RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
       
        //3:发送信号
        [subscriber sendNext:@"wp"];
        
        //请求网络 失败 error
        NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:10086 userInfo:@{@"key":@"10086错误"}];
        
        [subscriber sendError:error];
        
        //RACDisposable 销毁 
        return [RACDisposable disposableWithBlock:^{
            NSLog(@"销毁了");
        }];
    }];
    
    
    //2:订阅信号
    [signal subscribeNext:^(id  _Nullable x) { 
        NSLog(@"subscribeNext %@",x);
    }];
    
    //订阅错误信号
    [signal subscribeError:^(NSError * _Nullable error) {
        NSLog(@"subscribeError %@",error);
    }];

打印如下:

subscribeNext wp
销毁了
subscribeError Error Domain=NSURLErrorDomain Code=10086 "(null)" UserInfo={key=10086错误}
销毁了

2. 替代KVO

监听name的变化

    [RACObserve(self, name) subscribeNext:^(id  _Nullable x) {
        
        NSLog(@"%@",x);
        
    }];

3. 替代代理

设置代理,然后进行监听

    [[self rac_signalForSelector:@selector(textFieldDidBeginEditing:) fromProtocol:@protocol(UITextFieldDelegate)] subscribeNext:^(RACTuple * _Nullable x) {
        
        NSLog(@"textFieldDidBeginEditing %@",x);
    }];
    
    self.textField.delegate = self;

4. 替代通知

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

5. 替代UI逻辑

    //button 点击
    [[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        NSLog(@"%@",x);
    }];

    //textField 文字监听
    [self.textField.rac_textSignal subscribeNext:^(NSString * _Nullable x) {

        NSLog(@"%@",x);
    }];

    //手势监听
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] init];
    self.label.userInteractionEnabled = YES;
    [self.label addGestureRecognizer:tap];
    [tap.rac_gestureSignal subscribeNext:^(__kindof UIGestureRecognizer * _Nullable x) {
        NSLog(@"%@",x);
    }];

6. 替代数据遍历

//数组
NSArray *array = @[@"Cooci",@"123",@"18"];

[array.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
   
    NSLog(@"%@",x);
}];

NSDictionary *dict = @{@"key":@"Cooci",@"age":@"18",@"gender":@"1"};

[dict.rac_sequence.signal subscribeNext:^(id  _Nullable x) {
   //类似swift中的元祖
    NSLog(@"%@",x);
    
    RACTwoTuple *tuple = (RACTwoTuple *)x;
    
    NSLog(@"key == %@ , value = %@",tuple[0],tuple[1]);
  
}];

2019-01-31 10:54:33.728300+0800 001---RAC初探[2254:133490] wp
2019-01-31 10:54:33.728657+0800 001---RAC初探[2254:133490] 123
2019-01-31 10:54:33.728871+0800 001---RAC初探[2254:133490] 18
2019-01-31 10:54:33.729287+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x600002004390> (
key,
wp
)
2019-01-31 10:54:33.729404+0800 001---RAC初探[2254:133489] key == key , value = wp
2019-01-31 10:54:33.729639+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x6000020109a0> (
age,
18
)
2019-01-31 10:54:33.729744+0800 001---RAC初探[2254:133489] key == age , value = 18
2019-01-31 10:54:33.729933+0800 001---RAC初探[2254:133489] <RACTwoTuple: 0x6000020109e0> (
gender,
1
)
2019-01-31 10:54:33.730042+0800 001---RAC初探[2254:133489] key == gender , value = 1

7. 替代Timer

    NSLog(@"执行前 %@",[NSThread currentThread]);
    [[RACSignal interval:1 onScheduler:[RACScheduler schedulerWithPriority:(RACSchedulerPriorityHigh) name:@"com.ReactiveCocoa.RACScheduler.mainThreadScheduler"]] subscribeNext:^(NSDate * _Nullable x) {
        NSLog(@"执行时 %@",[NSThread currentThread]);
    }];

可以发现timer是在子线程执行的

2019-01-31 10:56:19.174662+0800 001---RAC初探[2346:137587] 执行前 <NSThread: 0x60000124e900>{number = 1, name = main}
2019-01-31 10:56:20.178857+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:21.177887+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:22.178262+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}
2019-01-31 10:56:23.177743+0800 001---RAC初探[2346:137617] 执行时 <NSThread: 0x600001229d80>{number = 3, name = (null)}