如何使用Swift的私有iOS框架？

Question

我想利用Swift应用程序在iOS上使用私有框架。我很清楚为什么这不是一个好主意，但是在测试中将很有用，因此App Store的限制不是问题，我已经详尽地研究了替代方案。

我想做的事情与此类似：

dlopen("/Developer/Library/PrivateFrameworks/UIAutomation.framework/UIAutomation".fileSystemRepresentation,RTLD_LOCAL);

let eventsclass = NSClassFromString("UIASyntheticEvents") as? UIASyntheticEvents.Type
eventGenerator = eventsclass!.sharedEventGenerator() as! UIASyntheticEvents

问题是这将导致链接器错误：

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_UIASyntheticEvents", referenced from:
      type metadata accessor for __ObjC.UIASyntheticEvents in Test.o

如果我直接链接框架而不是使用dlopen（），它将在模拟器上正常工作，但无法为实际设备构建，因为SDK中提供的框架仅用于模拟器，并且不会在设备期间链接建立。

我试图在Objective-C中进行这些调用，以防万一只是类型转换.Type导致问题，但这无济于事。如果我从Swift访问返回的对象，我仍然会遇到相同的错误。

我想我可以在Objective-C中创建一个包装器，将所有的调用直接传递给类，但这似乎是多余的。有没有更优雅的解决方案？

Answer 1

我找到了一种解决方案，它需要一些手动工作，但确实可以在纯Swift中工作。

诀窍是在Swift中创建一个与Objective-C方法匹配的@objc协议，然后对该协议类型进行不安全的转换。就我而言，该协议如下所示：

@objc protocol UIASyntheticEvents {
    static func sharedEventGenerator() -> UIASyntheticEvents

    //@property(readonly) struct __IOHIDEventSystemClient *ioSystemClient; // @synthesize ioSystemClient=_ioSystemClient;
    var voiceOverStyleTouchEventsEnabled: Bool { get set }
    var activePointCount: UInt64 { get set }
    //@property(nonatomic) CDStruct_3eca2549 *activePoints; // @synthesize activePoints=_activePoints;
    var gsScreenScale: Double { get set }
    var gsScreenSize: CGSize { get set }
    var screenSize: CGSize { get set }
    var screen: UIScreen { get set }
    var onScreenRect: CGRect { get set }

    func sendPinchCloseWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double, inRect: CGRect)
    func sendPinchOpenWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double, inRect: CGRect)
    func sendDragWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double, withFlick: Bool, inRect: CGRect)
    func sendRotate(_: CGPoint, withRadius: Double, rotation: Double, duration: Double, touchCount: UInt64)
    func sendMultifingerDragWithPointArray(_: UnsafePointer<CGPoint>, numPoints: Int32, duration: Double, numFingers: Int32)
    func sendPinchCloseWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double)
    func sendPinchOpenWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double)
    func sendFlickWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double)
    func sendDragWithStartPoint(_: CGPoint, endPoint: CGPoint, duration: Double)
    func sendTaps(_: Int, location: CGPoint, withNumberOfTouches: Int, inRect: CGRect)
    func sendDoubleFingerTap(_: CGPoint)
    func sendDoubleTap(_: CGPoint)
    func _sendTap(_: CGPoint, withPressure: Double)
    func sendTap(_: CGPoint)
    func _setMajorRadiusForAllPoints(_: Double)
    func _setPressureForAllPoints(_: Double)
    func moveToPoints(_: UnsafePointer<CGPoint>, touchCount: UInt64, duration: Double)
    func _moveLastTouchPoint(_: CGPoint)
    func liftUp(_: CGPoint)
    func liftUp(_: CGPoint, touchCount: UInt64)
    func liftUpAtPoints(_: UnsafePointer<CGPoint>, touchCount: UInt64)
    func touchDown(_: CGPoint)
    func touchDown(_: CGPoint, touchCount: UInt64)
    func touchDownAtPoints(_: UnsafePointer<CGPoint>, touchCount: UInt64)
    func shake()
    func setRinger(_: Bool)
    func holdVolumeDown(_: Double)
    func clickVolumeDown()
    func holdVolumeUp(_: Double)
    func clickVolumeUp()
    func holdLock(_: Double)
    func clickLock()
    func lockDevice()
    func holdMenu(_: Double)
    func clickMenu()
    func _sendSimpleEvent(_: Int)
    func setOrientation(_: Int32)
    func sendAccelerometerX(_: Double, Y: Double, Z: Double, duration: Double)
    func sendAccelerometerX(_: Double, Y: Double, Z: Double)
    func _updateTouchPoints(_: UnsafePointer<CGPoint>, count: UInt64)
    func _sendHIDVendorDefinedEvent(_: UInt32, usage: UInt32, data: UnsafePointer<UInt8>, dataLength: UInt32) -> Bool
    func _sendHIDScrollEventX(_: Double, Y: Double, Z: Double) -> Bool
    func _sendHIDKeyboardEventPage(_: UInt32, usage: UInt32, duration: Double) -> Bool
    //- (_Bool)_sendHIDEvent:(struct __IOHIDEvent *)arg1;
    //- (struct __IOHIDEvent *)_UIACreateIOHIDEventType:(unsigned int)arg1;    func _isEdgePoint(_: CGPoint) -> Bool
    func _normalizePoint(_: CGPoint) -> CGPoint
    //- (void)dealloc;
    func _initScreenProperties()
    //- (id)init;
}

这是从类转储输出手动转换的。如果有人知道更快的方法，我很想知道。

有了此协议后，您只需执行以下操作：

    dlopen("/Developer/Library/PrivateFrameworks/UIAutomation.framework/UIAutomation".fileSystemRepresentation,RTLD_LOCAL)

    let eventsclass = unsafeBitCast(NSClassFromString("UIASyntheticEvents"), UIASyntheticEvents.Type.self)
    eventGenerator = eventsclass.sharedEventGenerator()