RAC架构框架图
信号流程
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>}];
[[[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RACTupleRACTuple *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];
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);}];
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];
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