Without CF imported directly, one cannot use 'as' casts with CF types. Replace with unsafeBitCast() or other means as needed.

Author: millenomi

Sources/Foundation/Bundle.swift

@@ -15,7 +15,7 @@ private func _getTypeContextDescriptor(of cls: AnyClass) -> UnsafeRawPointer
 open class Bundle: NSObject {
     private var _bundleStorage: AnyObject!
     private var _bundle: CFBundle! {
-        get { _bundleStorage as! CFBundle? }
+        get { unsafeBitCast(_bundleStorage, to: CFBundle?.self) }
         set { _bundleStorage = newValue }
     }
 

Sources/Foundation/DateIntervalFormatter.swift

@@ -85,7 +85,7 @@ internal extension _CFDateIntervalFormatterBoundaryStyle {
 open class DateIntervalFormatter: Formatter {
     var _core: AnyObject
     var core: CFDateIntervalFormatter {
-        get { _core as! CFDateIntervalFormatter }
+        get { unsafeBitCast(_core, to: CFDateIntervalFormatter.self) }
         set { _core = newValue }
     }
 

Sources/Foundation/NSCFCharacterSet.swift

@@ -93,7 +93,7 @@ internal  func _CFSwiftCharacterSetCharacterIsMember(_ cset: CFTypeRef, _ ch: Un
 }
 
 internal  func _CFSwiftCharacterSetMutableCopy(_ cset: CFTypeRef) -> Unmanaged<CFMutableCharacterSet> {
-    return Unmanaged.passRetained((cset as! NSCharacterSet).mutableCopy() as! CFMutableCharacterSet)
+    return Unmanaged.passRetained(unsafeBitCast((cset as! NSCharacterSet).mutableCopy(), to: CFMutableCharacterSet.self))
 }
 
 internal  func _CFSwiftCharacterSetLongCharacterIsMember(_ cset: CFTypeRef, _ ch:UInt32) -> Bool {

Sources/Foundation/NSKeyedArchiver.swift

@@ -223,7 +223,7 @@ open class NSKeyedArchiver : NSCoder {
                 success = true
             }
         } else {
-            let stream = self._stream as! CFWriteStream
+            let stream = unsafeBitCast(self._stream, to: CFWriteStream.self)
             success = CFPropertyListWrite(plist, stream, kCFPropertyListXMLFormat_v1_0, 0, nil) > 0
         }
 

Sources/Foundation/NSRegularExpression.swift

@@ -30,7 +30,7 @@ extension NSRegularExpression {
 open class NSRegularExpression: NSObject, NSCopying, NSSecureCoding {
     internal var _internalStorage: AnyObject
     internal var _internal: _CFRegularExpression {
-        _internalStorage as! _CFRegularExpression
+        unsafeBitCast(_internalStorage, to: _CFRegularExpression.self)
     }
 
     open override func copy() -> Any {

Sources/Foundation/NSURL.swift

@@ -1165,7 +1165,7 @@ open class NSURLQueryItem : NSObject, NSSecureCoding, NSCopying {
 
 open class NSURLComponents: NSObject, NSCopying {
     private let _componentsStorage : AnyObject!
-    private var _components: CFURLComponents! { _componentsStorage as! CFURLComponents? }
+    private var _components: CFURLComponents! { unsafeBitCast(_componentsStorage, to: CFURLComponents?.self) }
 
     open override func copy() -> Any {
         return copy(with: nil)

Sources/Foundation/Process.swift

@@ -334,16 +334,24 @@ open class Process: NSObject {
         }
     }
 
-    private var _runLoopSourceContextStorage: Any? = nil
+    private class NonexportedCFRunLoopSourceContextStorage {
+        internal var value: CFRunLoopSourceContext?
+    }
+
+    private class NonexportedCFRunLoopSourceStorage {
+        internal var value: CFRunLoopSource?
+    }
+
+    private var _runLoopSourceContextStorage = NonexportedCFRunLoopSourceContextStorage()
     private var runLoopSourceContext: CFRunLoopSourceContext? {
-        get { _runLoopSourceContextStorage as! CFRunLoopSourceContext? }
-        set { _runLoopSourceContextStorage = newValue }
+        get { _runLoopSourceContextStorage.value }
+        set { _runLoopSourceContextStorage.value = newValue }
     }
 
-    private var _runLoopSourceStorage: Any? = nil
+    private var _runLoopSourceStorage = NonexportedCFRunLoopSourceStorage()
     private var runLoopSource: CFRunLoopSource? {
-        get { _runLoopSourceStorage as! CFRunLoopSource? }
-        set { _runLoopSourceStorage = newValue }
+        get { _runLoopSourceStorage.value }
+        set { _runLoopSourceStorage.value = newValue }
     }
 
     fileprivate weak var runLoop : RunLoop? = nil

Sources/Foundation/RunLoop.swift

@@ -55,7 +55,7 @@ internal func _NSRunLoopNew(_ cf: CFRunLoop) -> Unmanaged<AnyObject> {
 open class RunLoop: NSObject {
     internal var _cfRunLoopStorage : AnyObject!
     internal var _cfRunLoop: CFRunLoop! {
-        get { _cfRunLoopStorage as! CFRunLoop? }
+        get { unsafeBitCast(_cfRunLoopStorage, to: CFRunLoop?.self) }
         set { _cfRunLoopStorage = newValue }
     }
 
@@ -280,7 +280,7 @@ extension RunLoop {
     @available(*, deprecated, message: "For XCTest use only.")
     public class _Observer {
         fileprivate let _cfObserverStorage: AnyObject
-        fileprivate var cfObserver: CFRunLoopObserver { _cfObserverStorage as! CFRunLoopObserver }
+        fileprivate var cfObserver: CFRunLoopObserver { unsafeBitCast(_cfObserverStorage, to: CFRunLoopObserver.self) }
 
         fileprivate init(activities: _Activities, repeats: Bool, order: Int, handler: @escaping (_Activity) -> Void) {
             self._cfObserverStorage = CFRunLoopObserverCreateWithHandler(kCFAllocatorSystemDefault, CFOptionFlags(activities.rawValue), repeats, CFIndex(order), { (cfObserver, cfActivity) in
@@ -309,7 +309,7 @@ extension RunLoop {
     @available(*, deprecated, message: "For XCTest use only.")
     open class _Source: NSObject {
         fileprivate var _cfSourceStorage: AnyObject!
-        fileprivate var cfSource: CFRunLoopSource { _cfSourceStorage as! CFRunLoopSource }
+        fileprivate var cfSource: CFRunLoopSource { unsafeBitCast(_cfSourceStorage, to: CFRunLoopSource.self) }
 
 
         public init(order: Int = 0) {

Sources/Foundation/Stream.swift

@@ -108,8 +108,8 @@ open class InputStream: Stream {
         case cantSeekInputStream
     }
 
-    internal let _streamStorage: Any!
-    internal var _stream: CFReadStream { _streamStorage as! CFReadStream }
+    internal let _streamStorage: AnyObject!
+    internal var _stream: CFReadStream { unsafeBitCast(_streamStorage, to: CFReadStream.self) }
 
     // reads up to length bytes into the supplied buffer, which must be at least of size len. Returns the actual number of bytes read.
     open func read(_ buffer: UnsafeMutablePointer<UInt8>, maxLength len: Int) -> Int {
@@ -185,8 +185,8 @@ open class InputStream: Stream {
 // Currently this is left as named OutputStream due to conflicts with the standard library's text streaming target protocol named OutputStream (which ideally should be renamed)
 open class OutputStream : Stream {
 
-    internal let _streamStorage: Any!
-    internal var _stream: CFWriteStream { _streamStorage as! CFWriteStream }
+    internal let _streamStorage: AnyObject!
+    internal var _stream: CFWriteStream { unsafeBitCast(_streamStorage, to: CFWriteStream.self) }
 
     // writes the bytes from the specified buffer to the stream up to len bytes. Returns the number of bytes actually written.
     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int {

Sources/Foundation/Timer.swift

@@ -26,7 +26,7 @@ open class Timer : NSObject {
     }
 
     internal var _timerStorage: AnyObject?
-    internal var _timer: CFRunLoopTimer? { _timerStorage as! CFRunLoopTimer? } // has to be optional because this is a chicken/egg problem with initialization in swift
+    internal var _timer: CFRunLoopTimer? { unsafeBitCast(_timerStorage, to: CFRunLoopTimer?.self) } // has to be optional because this is a chicken/egg problem with initialization in swift
     internal var _fire: (Timer) -> Void = { (_: Timer) in }
 
     /// Alternative API for timer creation with a block.