added support for UIPageControl

Source/UIKit/UIPageControl.swift

@@ -0,0 +1,26 @@
+//
+//  UIPageControl.swift
+//  Rex
+//
+//  Created by Torsten Curdt on 7/24/16.
+//  Copyright (c) 2015 Torsten Curdt. All rights reserved.
+//
+
+import ReactiveCocoa
+import UIKit
+
+extension UIPageControl {
+
+    /// Wraps a page control's `numberOfPages` value in a bindable property.
+    public var rex_numberOfPages: MutableProperty<Int> {
+        return associatedProperty(self, key: &numberOfPagesKey, initial: { $0.numberOfPages }, setter: { $0.numberOfPages = $1 })
+    }
+
+    /// Wraps a page control's `currentPage` value in a bindable property.
+    public var rex_currentPage: MutableProperty<Int> {
+        return associatedProperty(self, key: &currentPageKey, initial: { $0.currentPage }, setter: { $0.currentPage = $1 })
+    }
+}
+
+private var numberOfPagesKey: UInt8 = 0
+private var currentPageKey: UInt8 = 0

Tests/UIKit/UIPageControlTest.swift

@@ -0,0 +1,47 @@
+//
+//  UIPageControl.swift
+//  Rex
+//
+//  Created by Torsten Curdt on 7/24/16.
+//  Copyright (c) 2015 Torsten Curdt. All rights reserved.
+//
+
+import XCTest
+import ReactiveCocoa
+import Result
+
+class UIPageControlTests: XCTestCase {
+
+    weak var _pageControl: UIPageControl?
+
+    override func tearDown() {
+        XCTAssert(_pageControl == nil, "Retain cycle detected in UIPageControl properties")
+        super.tearDown()
+    }
+
+    func testNumberOfPages() {
+        let pageControl = UIPageControl(frame: CGRectZero)
+        _pageControl = pageControl
+
+        let (pipeSignal, observer) = Signal<Int, NoError>.pipe()
+        pageControl.rex_numberOfPages <~ SignalProducer(signal: pipeSignal)
+
+        observer.sendNext(1)
+        XCTAssertTrue(pageControl.numberOfPages == 1)
+        observer.sendNext(2)
+        XCTAssertTrue(pageControl.numberOfPages == 2)
+    }
+
+    func testNumberOfPages() {
+        let pageControl = UIPageControl(frame: CGRectZero)
+        _pageControl = pageControl
+
+        let (pipeSignal, observer) = Signal<Int, NoError>.pipe()
+        pageControl.rex_currentPage <~ SignalProducer(signal: pipeSignal)
+
+        observer.sendNext(1)
+        XCTAssertTrue(pageControl.currentPage == 1)
+        observer.sendNext(2)
+        XCTAssertTrue(pageControl.currentPage == 2)
+    }
+}