RAC（二）

RAC常用方法

• (instancetype)flattenMap:(RACStream * (^)(id value))block {}
  直接返回订阅的信号

RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"Signal"];
[subscriber sendCompleted];
return nil;
}];
[[signal flattenMap:^RACStream *(id value) {
return [RACReturnSignal return:value];
}] subscribeNext:^(id x) {
NSLog(@"%@",x);
}];

• (instancetype)map:(id (^)(id value))block{}
  返回任意类型的对象

[[signal map:^id(id value) {
NSLog(@"%@",value);
return value;
}] subscribeNext:^(id x) {
NSLog(@"%@",x);
}];

• (RACSignal *)concat:(RACSignal *)signal {}
  组合信号
  [[signalB concat:signalA] subscribeNext:^(id _Nullable x) {
  NSLog(@"result is = %@", x);
  }];
  只有signalB执行完[subscriber sendCompleted];才会顺序执行signalA

• (RACSignal *)then:(RACSignal * (^)(void))block {}
  组合信号
  和上面类似

• (RACSignal *)merge:(RACSignal *)signal {}
  返回一个元组

[[signalA merge:signalB] subscribeNext:^(id x) {
NSLog(@"%@",x);
}];

• (RACSignal *)zipWith:(RACSignal *)signal {}

[[signalA zipWith:signalB] subscribeNext:^(id _Nullable x) {
NSLog(@"%@", x);
}];

• (RACSignal *)combineLatest:(id<NSFastEnumeration>)signals reduce:(id (^)())reduceBlock {}

  RACSignal *combineSignal = [RACSignal combineLatest:@[_usernameTextField.rac_textSignal, _passwordTextField.rac_textSignal] reduce:^id(NSString *username, NSString *password){
  return @(username.length && password.length);
  }];
  //作为button是否能点击的组合信号
  RAC(_loginButton,enabled) = combineSignal;

过滤
filter:
ignore:
take:
distinctUntilChanged
skip:

参考http://www.jianshu.com/p/715b7235da1d