Merge pull request #1 from alexsun/master

增加能自动推断类型的 loadFromNib 方法

Author: csc-EricWu

CRBoostSwift/Classes/UIKit+CRBoost.swift

@@ -178,6 +178,13 @@ extension UIView {
         let view = nib![0]
         return view as! T
     }
+    
+    @discardableResult
+    public class func loadFromNib(nibName: String) -> Self {
+        let nib = Bundle.main.loadNibNamed(nibName, owner: self, options: [:])
+        let view = nib![0]
+        return view as! Self
+    }
 
     @discardableResult
     public func topLayerSubview(_ tag: Int) -> UIView? {