flattenMap:
RACSubject * subject = [RACSubject subject];
RACSignal * binSignal = [subject flattenMap:^__kindof RACSignal * _Nullable(id _Nullable value) {
// value 原信號的內容
value = [NSString stringWithFormat:@"數據處理: %@",value];
return [RACReturnSignal return:value];
}];
[binSignal subscribeNext:^(id _Nullable x) {
NSLog(@"%@",x);
}];
[subject sendNext:@"123"];
样例2
RACSequence * s1 = [@[@(1), @(2), @(3)] rac_sequence];
RACSequence * s2 = [@[@(1), @(3), @(9)] rac_sequence];
RACSequence * s3 = [[@[s1,s2] rac_sequence]
flattenMap:^__kindof RACSequence * _Nullable(id _Nullable value) {
return [value filter:^BOOL(id _Nullable value) {
return [value integerValue] % 3 == 0;
}];
}];
NSLog(@"%@",[s3 array]);//打印3、3、9
