间取值

2017 - 07 - 26

代码

let A = PublishSubject<Void>()  
let B = PublishSubject<String>()  

let observable = A.withLatestFrom(B)  
// let observable = B.sample(A)  
let disposable = observable.subscribe(onNext: { value in  
    print(value)  
})  

B.onNext("Par")  
B.onNext("Pari")  
B.onNext("Paris")  
A.onNext()  
A.onNext()

下面各方法替换后的输出

withLatestFrom

Paris  
Paris

A取时序和值 B只取最新值(B时序无用)

与CombineLatest区别:
两信号时序和值均取 每个信号流触发时 结合两信号流最新值

sample

Paris

A取时序 B取值
且若B值未更新 不输出
注: A作为参数传入



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