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這篇文章給大家分享的是有關(guān)怎么使用ReactiveObjC的內(nèi)容。小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，一起跟隨小編過來(lái)看看吧。
RAC架構(gòu)框架圖
信號(hào)流程
UITextField
//監(jiān)聽文本輸入
[[_textField rac_textSignal] subscribeNext:^(NSString * _Nullable x) {
NSLog(@"%@",x);
}];
//可根據(jù)自己想要監(jiān)聽的事件選擇
[[_textField rac_signalForControlEvents:UIControlEventEditingChanged] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"%@",x);
}];
//添加條件 -- 下面表示輸入文字長(zhǎng)度 > 10 時(shí)才會(huì)調(diào)用subscribeNext
[[_textField.rac_textSignal filter:^BOOL(NSString * _Nullable value) {
return value.length > 10;
}] subscribeNext:^(NSString * _Nullable x) {
NSLog(@"輸入框內(nèi)容：%@", x); }];UIButton
//監(jiān)聽按鈕點(diǎn)擊事件
[[_btn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
NSLog(@"-->%@",x);
}];計(jì)時(shí)器（interval、delay）
//類似timer
@weakify(self)
self.disposable = [[RACSignal interval:2 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSDate * _Nullable x) {
@strongify(self)
NSLog(@"時(shí)間：%@", x); // x 是當(dāng)前的時(shí)間
//關(guān)閉計(jì)時(shí)器
[self.disposable dispose];
}];
//延時(shí)
[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"延時(shí)2秒"];
return nil;<br>}] delay:2] subscribeNext:^(id x) {
NSLog(@"-->%@",x);
}];//監(jiān)聽self的name屬性
[RACObserve(self, name) subscribeNext:^(id _Nullable x) {
NSLog(@"屬性的改變-->%@",x);
}];
[[self rac_valuesForKeyPath:@"name" observer:self] subscribeNext:^(id _Nullable x) {
NSLog(@"屬性的改變-->%@", x);
}];
//此處RAC宏相當(dāng)于讓_label訂閱了_textField的文本變化信號(hào)
//賦值給label的text屬性
RAC(_label, text) = _textField.rac_textSignal;//遍歷數(shù)組
NSArray *array = @[@"1", @"2", @"3", @"4", @"5"];
[array.rac_sequence.signal subscribeNext:^(id _Nullable x) {
NSLog(@"內(nèi)容-->%@", x)<br>}];
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"notification" object:nil] subscribeNext:^(NSNotification * _Nullable x) {
NSLog(@"-->%@", x);
}];//監(jiān)聽按鈕點(diǎn)擊方法的信號(hào)
//當(dāng)執(zhí)行完btnClickAction后會(huì)執(zhí)行此訂閱
[[self rac_signalForSelector:@selector(btnClickAction:)] subscribeNext:^(RACTuple * _Nullable x) {
NSLog(@"-->%@", x);
}];
-(void) btnClickAction:(UIButton *)btn
{
NSLog(@"按鈕點(diǎn)擊");
}RACSignal
RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"???????"];
[subscriber sendCompleted];
return [RACDisposable disposableWithBlock:^{
NSLog(@"銷毀了???");
}];
}];
[signal subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];RACSubject(可發(fā)送信號(hào)也可以訂閱信號(hào))
RACTuple（元組）-- 其內(nèi)部就是封裝了數(shù)組，用起來(lái)跟數(shù)組差不多
//通過定值創(chuàng)建RACTuple RACTuple *tuple = [RACTuple tupleWithObjects:@"1", @"2", @"3", nil]; //利用 RAC 宏快速封裝 RACTuple *tuple2 = RACTuplePack(@"1", @"2", @"3"); //從別的數(shù)組中獲取內(nèi)容 RACTuple *tuple3 = [RACTuple tupleWithObjectsFromArray:@[@"1", @"2", @"3"]]; NSLog(@"元組-->%@", tuple3[0]); NSLog(@"第一個(gè)元素-->%@", [tuple3 first]); NSLog(@"最后一個(gè)元素-->%@", [tuple3 last]);
RACMulticastConnection -- 用于當(dāng)一個(gè)信號(hào)，被多次訂閱時(shí)，為了保證創(chuàng)建信號(hào)時(shí)，避免多次調(diào)用創(chuàng)建信號(hào)中的block
RACSignal *signal1 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"signal1-->???????"];
[subscriber sendCompleted];
return [RACDisposable disposableWithBlock:^{
NSLog(@"signal1銷毀了");
}];
}];
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 -- 可以監(jiān)聽信號(hào)的狀態(tài)等
NSString *input = @"執(zhí)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銷毀了");
}];
}];
}];
[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);
}];
//開始執(zhí)行
[command execute:input];
首先創(chuàng)建兩個(gè)信號(hào)signal1和signal2來(lái)演示
RACSignal *signal1 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"signal1-->???????"];
[subscriber sendCompleted];
return [RACDisposable disposableWithBlock:^{
NSLog(@"signal1銷毀了");
}];
}];
RACSignal *signal2 = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber> _Nonnull subscriber) {
[subscriber sendNext:@"signal2-->???????"];
[subscriber sendCompleted];
return [RACDisposable disposableWithBlock:^{
NSLog(@"signal2銷毀了");
}];
}];1.1、 concat -- 當(dāng)多個(gè)信號(hào)發(fā)出的時(shí)候，有順序的接收信號(hào)
一個(gè)信號(hào)signal3去監(jiān)聽signal1和signal2，必須是接收signal1完后才會(huì)接收signal2
RACSignal *signal3 = [signal1 concat:signal2];
[signal3 subscribeNext:^(id _Nullable x) {
NSLog(@"signal3-->%@",x);
}];
1.2、 combineLatestWith -- 將多個(gè)信號(hào)合并起來(lái)，并且拿到各個(gè)信號(hào)的最新的值,必須每個(gè)合并的signal至少都有過一次sendNext，才會(huì)觸發(fā)合并的信號(hào)(訂閱者每次接收的參數(shù)都是所有信號(hào)的最新值),不論觸發(fā)哪個(gè)信號(hào)都會(huì)觸發(fā)合并的信號(hào)
一個(gè)信號(hào)signal3去監(jiān)聽signal1和signal2，每次回調(diào)兩個(gè)信號(hào)的最新值
RACSignal *signal3 = [signal1 combineLatestWith:signal2];
[signal3 subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
PS：注釋signal1的sendNext方法，直接銷毀了，所以每個(gè)singal必須有sendNext方法
1.3、 then -- 用于連接兩個(gè)信號(hào)，等待第一個(gè)信號(hào)完成，才會(huì)連接then返回的信號(hào)
RACSignal *signal3 = [signal1 then:^RACSignal * _Nonnull{
return signal2;
}];
[signal3 subscribeNext:^(id _Nullable x) {
NSLog(@"signal3-->%@",x);
}];
1.4、 merge -- 把多個(gè)信號(hào)合并為一個(gè)信號(hào)來(lái)監(jiān)聽，任何一個(gè)信號(hào)有新值的時(shí)候就會(huì)調(diào)用
一個(gè)信號(hào)signal3去監(jiān)聽signal1和signal2，每次回調(diào)一個(gè)信號(hào)
RACSignal *signal3 = [signal1 merge:signal2];
[signal3 subscribeNext:^(id _Nullable x) {
NSLog(@"signal3-->%@",x);
}];
1.5、 zipWith -- 把兩個(gè)信號(hào)壓縮成一個(gè)信號(hào)，只有當(dāng)兩個(gè)信號(hào)都發(fā)出信號(hào)內(nèi)容時(shí)，才會(huì)觸發(fā)
一個(gè)信號(hào)signal3去監(jiān)聽signal1和signal2，但必須兩個(gè)信號(hào)都有發(fā)出（不需要同時(shí)，例如signal1信號(hào)發(fā)出了，signal2信號(hào)等了10秒之后發(fā)出，那么signal3的訂閱回調(diào)是等signal2信號(hào)發(fā)出的那一刻觸發(fā)）
RACSignal *signal3 = [signal1 zipWith:signal2];
[signal3 subscribeNext:^(id _Nullable x) {
NSLog(@"signal3-->%@",x);
}];1.6、 reduce 聚合 -- 把多個(gè)信號(hào)的值按照自定義的組合返回
RACSignal *signal3 = [RACSignal combineLatest:@[signal1,signal2] reduce:^id(NSString *s1 ,NSString *s2){
return [NSString stringWithFormat:@"%@ %@",s1,s2];
}];
[signal3 subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
flattenMap 的底層實(shí)現(xiàn)是通過bind實(shí)現(xiàn)的
map 的底層實(shí)現(xiàn)是通過 flattenMap 實(shí)現(xiàn)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);
}] ;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];
感謝各位的閱讀！關(guān)于“怎么使用ReactiveObjC”這篇文章就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，讓大家可以學(xué)到更多知識(shí)，如果覺得文章不錯(cuò)，可以把它分享出去讓更多的人看到吧！
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