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UIButton.rex_pressed example in README #58

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Oct 30, 2015
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UIButton.rex_pressed example in README #58

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UIButton.rex_pressed example in README
skyylex Oct 30, 2015
b402f1c
Code zip and extended explanation
skyylex Oct 30, 2015
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22 changes: 22 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,28 @@ func propertySink<S: SinkType>(sink: S)(signal: Signal<S.Element, NoError>) -> P
func propertySink<S: SinkType>(sink: S)(producer: SignalProducer<S.Element, NoError>) -> PropertyOf<S>
```

## UIKit Extensions

##### `UIButton.rex_pressed`

Flexible way to bind CocoaAction to the press of button.
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Can you add another sentence that the button is automatically disabled while the Action is executing.


```swift
let downloadAction: Action<Void, NSData, NoError> = Action { _ in
return SignalProducer { observer, disposable in
if let zipURL = NSURL(string: "https://github.com/neilpa/Rex/archive/master.zip") {
if let zipData = NSData(contentsOfURL: zipURL) {
observer.sendNext(zipData)
observer.sendCompleted()
}
}
}
}

let downloadCocoaAction = CocoaAction(downloadAction, input: ())
let cocoaActionProducer: SignalProducer<CocoaAction, NoError> = SignalProducer<CocoaAction, NoError>(value: downloadCocoaAction)
startDownloadButton.rex_pressed <~ cocoaActionProducer
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This can be simplified a bit

let downloadAction = Action<UIButton, NSData, NSError> { _ in
    let url = NSURL(string: "https://github.com/neilpa/Rex/archive/master.zip")
    let request = NSURLRequest(URL: url!)
    return NSURLSession.sharedSession().rac_dataWithRequest(request).map { $0.0 }
}

downloadButton.rex_pressed.value = downloadAction.unsafeCocoaAction

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The only time you need to bind with <~ is if the underlying action will change over time. That'll be the uncommon case when building UI.

```

## License
Rex is released under the [MIT license](LICENSE)