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rac-时间 interval delay

admin 11月 12, 2020 0

timeout：超时，可以让一个信号在一定的时间后，自动报错。

RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
 return nil;
}] timeout:1 onScheduler:[RACScheduler currentScheduler]];
[signal subscribeNext:^(id x) {
 NSLog(@"%@",x);
} error:^(NSError *error) {
 
 NSLog(@"%@",error);
}];

interval

interval 定时：每隔一段时间发出信号

[[RACSignal interval:1 onScheduler:[RACScheduler currentScheduler]] subscribeNext:^(id x) {
 NSLog(@"%@",x);
}];

delay

delay 延迟发送next。

 RACSignal *signal = [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
 [subscriber sendNext:@1];
 return nil;
}] delay:2] subscribeNext:^(id x) {
 NSLog(@"%@",x);
}];

startWith:在发送消息之前,先发送一个消息

 RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            [subscriber sendNext:@"DanaChu"];
            [subscriber sendCompleted];
            return nil;
        }] startWith:@"RAC"];
        [signal subscribeNext:^(id x) {
            NSLog(@"%@",x);
        }];
// output:
//        RAC
//        DanaChu