Add support for direct instantiation of UIView from nib

Example/ReusableDemo.xcodeproj/project.pbxproj

@@ -27,6 +27,7 @@
 		09B346421C4EF71900BA041F /* MyXIBIndexSquaceCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = 09B346401C4EF71900BA041F /* MyXIBIndexSquaceCell.xib */; };
 		09B346441C4EF8B700BA041F /* CollectionHeaderView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 09B346431C4EF8B700BA041F /* CollectionHeaderView.swift */; };
 		09B346461C4EF8F600BA041F /* CollectionHeaderView.xib in Resources */ = {isa = PBXBuildFile; fileRef = 09B346451C4EF8F600BA041F /* CollectionHeaderView.xib */; };
+		CD1A4B0A1C5A1BAF00F28455 /* NibLoadable.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD1A4B091C5A1BAF00F28455 /* NibLoadable.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -55,6 +56,7 @@
 		09B346401C4EF71900BA041F /* MyXIBIndexSquaceCell.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = MyXIBIndexSquaceCell.xib; sourceTree = "<group>"; };
 		09B346431C4EF8B700BA041F /* CollectionHeaderView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CollectionHeaderView.swift; sourceTree = "<group>"; };
 		09B346451C4EF8F600BA041F /* CollectionHeaderView.xib */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.xib; path = CollectionHeaderView.xib; sourceTree = "<group>"; };
+		CD1A4B091C5A1BAF00F28455 /* NibLoadable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NibLoadable.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -75,7 +77,9 @@
 				09B3460B1C4ED26F00BA041F /* ReusableDemo */,
 				09B3460A1C4ED26F00BA041F /* Products */,
 			);
+			indentWidth = 2;
 			sourceTree = "<group>";
+			tabWidth = 2;
 		};
 		09B3460A1C4ED26F00BA041F /* Products */ = {
 			isa = PBXGroup;
@@ -127,6 +131,7 @@
 		09B3462C1C4ED6F000BA041F /* Reusable */ = {
 			isa = PBXGroup;
 			children = (
+				CD1A4B091C5A1BAF00F28455 /* NibLoadable.swift */,
 				09B3462D1C4ED72B00BA041F /* Reusable.swift */,
 				09B3462F1C4ED75400BA041F /* README.md */,
 				09B346351C4EF12200BA041F /* CHANGELOG.md */,
@@ -236,6 +241,7 @@
 				09B346281C4ED51600BA041F /* MyXIBSwitchCell.swift in Sources */,
 				09B346441C4EF8B700BA041F /* CollectionHeaderView.swift in Sources */,
 				09B3462B1C4ED6C400BA041F /* MySimpleColorCell.swift in Sources */,
+				CD1A4B0A1C5A1BAF00F28455 /* NibLoadable.swift in Sources */,
 				09B346371C4EF13300BA041F /* Reusable.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

Sources/NibLoadable.swift

@@ -0,0 +1,29 @@
+import UIKit
+
+/// Make your UIView subclasses
+/// conform to this protocol when they *are* NIB-based
+/// to be able to instantiate them from NIB in a type-safe manner
+public protocol NibLoadable: class {
+  static var nib: UINib { get }
+}
+
+// MARK: - Default implementation form NibLoadable
+
+public extension NibLoadable {
+  static var nib: UINib {
+    return UINib(nibName: String(Self), bundle: nil)
+  }
+}
+
+// MARK: - Support for instantiation from nib
+
+public extension NibLoadable where Self: UIView {
+  /**
+   Returns a `UIView` object instantiated from nib
+
+   - returns: A `NibLoadable`, `UIView` instance
+   */
+  static func loadFromNib() -> Self {
+    return nib.instantiateWithOwner(nil, options: nil).first as! Self
+  }
+}

Sources/Reusable.swift

@@ -10,29 +10,24 @@ public protocol Reusable: class {
 /// Make your UITableViewCell and UICollectionViewCell subclasses
 /// conform to this protocol when they *are* NIB-based
 /// to be able to dequeue them in a type-safe manner
-public protocol NibReusable: Reusable {
-  static var nib: UINib { get }
-}
+public protocol NibReusable: Reusable, NibLoadable {}
+
+// MARK: - Default implementation for Reusable
 
 public extension Reusable {
   static var reuseIdentifier: String {
     return String(Self)
   }
 }
-public extension NibReusable {
-  static var nib: UINib {
-    return UINib(nibName: String(Self), bundle: nil)
-  }
-}
 
 // MARK: - UITableView support for Reusable & NibReusable
 
 public extension UITableView {
   /**
    Register a NIB-Based `UITableViewCell` subclass (conforming to `NibReusable`)
-   
+
    - parameter cellType: the `UITableViewCell` (`NibReusable`-conforming) subclass to register
-   
+
    - seealso: `registerNib(_:,forCellReuseIdentifier:)`
    */
   func registerReusableCell<T: UITableViewCell where T: NibReusable>(cellType: T.Type) {
@@ -41,9 +36,9 @@ public extension UITableView {
 
   /**
    Register a Class-Based `UITableViewCell` subclass (conforming to `Reusable`)
-   
+
    - parameter cellType: the `UITableViewCell` (`Reusable`-conforming) subclass to register
-   
+
    - seealso: `registerClass(_:,forCellReuseIdentifier:)`
    */
   func registerReusableCell<T: UITableViewCell where T: Reusable>(cellType: T.Type) {
@@ -52,11 +47,11 @@ public extension UITableView {
 
   /**
    Returns a reusable `UITableViewCell` object for the class infered by the return-type
-   
+
    - parameter indexPath: The index path specifying the location of the cell.
-   
+
    - returns: A `Reusable`, `UITableViewCell` instance
-   
+
    - seealso: `dequeueReusableCellWithIdentifier(_:,forIndexPath:)`
    */
   func dequeueReusableCell<T: UITableViewCell where T: Reusable>(indexPath indexPath: NSIndexPath) -> T {
@@ -65,9 +60,9 @@ public extension UITableView {
 
   /**
    Register a NIB-Based `UITableViewHeaderFooterView` subclass (conforming to `NibReusable`)
-   
+
    - parameter viewType: the `UITableViewHeaderFooterView` (`NibReusable`-conforming) subclass to register
-   
+
    - seealso: `registerNib(_:,forHeaderFooterViewReuseIdentifier:)`
    */
   func registerReusableHeaderFooterView<T: UITableViewHeaderFooterView where T: NibReusable>(viewType: T.Type) {
@@ -76,9 +71,9 @@ public extension UITableView {
 
   /**
    Register a Class-Based `UITableViewHeaderFooterView` subclass (conforming to `Reusable`)
-   
+
    - parameter viewType: the `UITableViewHeaderFooterView` (`Reusable`-confirming) subclass to register
-   
+
    - seealso: `registerClass(_:,forHeaderFooterViewReuseIdentifier:)`
    */
   func registerReusableHeaderFooterView<T: UITableViewHeaderFooterView where T: Reusable>(viewType: T.Type) {
@@ -87,9 +82,9 @@ public extension UITableView {
 
   /**
    Returns a reusable `UITableViewHeaderFooterView` object for the class infered by the return-type
-   
+
    - returns: A `Reusable`, `UITableViewHeaderFooterView` instance
-   
+
    - seealso: `dequeueReusableHeaderFooterViewWithIdentifier(_:)`
    */
   func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView where T: Reusable>() -> T? {
@@ -102,20 +97,20 @@ public extension UITableView {
 public extension UICollectionView {
   /**
    Register a NIB-Based `UICollectionViewCell` subclass (conforming to `NibReusable`)
-   
+
    - parameter cellType: the `UICollectionViewCell` (`NibReusable`-conforming) subclass to register
-   
+
    - seealso: `registerNib(_:,forCellWithReuseIdentifier:)`
    */
   func registerReusableCell<T: UICollectionViewCell where T: NibReusable>(cellType: T.Type) {
     self.registerNib(T.nib, forCellWithReuseIdentifier: T.reuseIdentifier)
   }
-  
+
   /**
    Register a Class-Based `UICollectionViewCell` subclass (conforming to `Reusable`)
-   
+
    - parameter cellType: the `UICollectionViewCell` (`Reusable`-conforming) subclass to register
-   
+
    - seealso: `registerClass(_:,forCellWithReuseIdentifier:)`
    */
   func registerReusableCell<T: UICollectionViewCell where T: Reusable>(cellType: T.Type) {
@@ -124,11 +119,11 @@ public extension UICollectionView {
 
   /**
    Returns a reusable `UICollectionViewCell` object for the class infered by the return-type
-   
+
    - parameter indexPath: The index path specifying the location of the cell.
-   
+
    - returns: A `Reusable`, `UICollectionViewCell` instance
-   
+
    - seealso: `dequeueReusableCellWithReuseIdentifier(_:,forIndexPath:)`
    */
   func dequeueReusableCell<T: UICollectionViewCell where T: Reusable>(indexPath indexPath: NSIndexPath) -> T {
@@ -137,36 +132,36 @@ public extension UICollectionView {
 
   /**
    Register a NIB-Based `UICollectionReusableView` subclass (conforming to `NibReusable`) as a Supplementary View
-   
+
    - parameter elementKind: The kind of supplementary view to create.
    - parameter viewType: the `UIView` (`NibReusable`-conforming) subclass to register as Supplementary View
-   
+
    - seealso: `registerNib(_:,forSupplementaryViewOfKind:,withReuseIdentifier:)`
    */
   func registerReusableSupplementaryView<T: UICollectionReusableView where T: NibReusable>(elementKind: String, viewType: T.Type) {
-      self.registerNib(T.nib, forSupplementaryViewOfKind: elementKind, withReuseIdentifier: T.reuseIdentifier)
+    self.registerNib(T.nib, forSupplementaryViewOfKind: elementKind, withReuseIdentifier: T.reuseIdentifier)
   }
-  
+
   /**
    Register a Class-Based `UICollectionReusableView` subclass (conforming to `Reusable`) as a Supplementary View
-   
+
    - parameter elementKind: The kind of supplementary view to create.
    - parameter viewType: the `UIView` (`Reusable`-conforming) subclass to register as Supplementary View
-   
+
    - seealso: `registerClass(_:,forSupplementaryViewOfKind:,withReuseIdentifier:)`
    */
   func registerReusableSupplementaryView<T: UICollectionReusableView where T: Reusable>(elementKind: String, viewType: T.Type) {
-      self.registerClass(T.self, forSupplementaryViewOfKind: elementKind, withReuseIdentifier: T.reuseIdentifier)
+    self.registerClass(T.self, forSupplementaryViewOfKind: elementKind, withReuseIdentifier: T.reuseIdentifier)
   }
 
   /**
    Returns a reusable `UICollectionReusableView` object for the class infered by the return-type
-   
+
    - parameter elementKind: The kind of supplementary view to retrieve.
    - parameter indexPath:   The index path specifying the location of the cell.
-   
+
    - returns: A `Reusable`, `UICollectionReusableView` instance
-   
+
    - seealso: `dequeueReusableSupplementaryViewOfKind(_:,withReuseIdentifier:,forIndexPath:)`
    */
   func dequeueReusableSupplementaryView<T: UICollectionReusableView where T: Reusable>(elementKind: String, indexPath: NSIndexPath) -> T {