ReactiveCocoa v4.2 發布

ReactiveCocoa的核心為signals即RACSignal類。Signals發出三種類型的事件流:next、completed、和error。

通過此模式,ReactiveCocoa可以用來替代delegate、target-action、key-value observing等模式。

通過signal API創建的代碼更加統一且易讀.但ReactiveCocoa真正強大之處在于通過這些信號源能進行更多高級操作.這些操作能在相當簡潔高雅的操作下執行復雜的篩選、轉換、信號協調等。在MVVM中,ReactiveCocoa扮演著重要角色.它提供ViewModel和View之間的綁定操作。

更新日志

新增

• ActionType protocol for extending Actions (#2828, thanks @ikesyo and @cradnovich!)
• Signal.sampleWith()/SignalProducer.sampleWith(), which behaves like sampleOn() but includes the value from the sampler (#2792, thanks @victorlin!)
• PropertyType.map() for transforming properties (#2788, thanks @sdduursma and @filblue!)
• A Swift playground demonstrating ReactiveCocoa (#2795, #2850, #2930, #2943, thanks@RuiAAPeres, @iv-mexx, and @tomj!)
• Signal.logEvents()/SignalProducer.logEvents() for debugging (#2839, #2895, #2897, thanks@RuiAAPeres and @ikesyo!)
• Count- and predicate–based variants of Signal.collect() and SignalProducer.collect() (#2835, thanks @dmcrodrigues!)
• A convenience initializer to CompositeDisposable that takes a SequenceType of Disposable?s (#2806, thanks @larryonoff!)
• Signal.uniqueValues()/SignalProducer.uniqueValues() (#2884, thanks @mdiep and@nixterrimus!)
• Overloads for flatMap() and flatten() for Signals and SignalProducers with NoError (#2885, thanks @mdiep, @NachoSoto, and @andymatuschak!)
• += variant for CompositeDisposable and ActionDisposable (#2920, thanks @ikesyo!)
• SignalProducer.init(values: Value...) (#2928, thanks @larryonoff!)
• SignalProducer.self.merge() (#2925, #2931, thanks @larryonoff and @ikesyo!)
• SignalProducer.prefix(value:) and SignalProducer.prefix() for providing initial values (#2941#2954, thanks @inamiy and @RuiAAPeres!)
• SignalProducer.concat(value:) for concatenating a value (#2954, thanks @RuiAAPeres!)

改進

• SignalProducer.replayLazily() no longer uses NSObject (#2811, thanks @ikesyo!)
• NSNotificationCenter.rac_notifications() will now interrupt if the object deallocates before the producer starts (#2859, thanks @ikesyo and @andymatuschak!)
• <~ will now automatically bridge values to Objective-C (#2551, thanks @sharplet!)

修復

• Memory leak in SignalProducer.lift(), which is used internally in many operators (#2800, thanks@ikesyo and @trifonov-ivan!)
• Recursive observation of MutablePropertys (#2764, thanks @andersio and @olegshnitko!)
• Replace uses of spinlocks because they’re not safe on some devices (#2670, thanks@Adlai-Holler!)
• Potential deadlock in SignalProducer.buffer() (#2900, thanks @mdiep!)
• SignalProducer.replayLazily() won’t interrupt while there are active subscriptions (#2903, thanks@mdiep!)
• Retain cycle with Action.unsafeCocoaAction (#2910, thanks @mdiep!)
• UIScheduler now delivers events on the main queue (#2912, thanks @ikesyo!)

Objective-C

新增

• RACDelegateProxy is now public (#2869, thanks @mdiep!)

改進

• RACCommand now specifies that its InputType is contravariant (#2696, thanks @erichoracek!)

修復

• Behavior of -[RACSequence foldRightWithStart:reduce:] (#2777, thanks @ikesyo!)
• Memory leak in -[UIControl rac_signalForControlEvents:] (#2797, thanks @vagase!)
• Memory leak in RACSubject (#2845, thanks @ikesyo and @tzongw!)
• Retaining of signals in -[RACSignal bind:], which underpins most operators (#2935, thanks@tzongw!)

下載

• 35 MBReactiveCocoa.framework.zip
• Source code (zip)
• Source code (tar.gz)