Swizzling

Swizzling example

// Swizzling
extension NSObject {

  class func swizzleMethods(origSelector: Selector, withSelector: Selector,
    forClass: AnyClass) {

    let originalMethod = class_getInstanceMethod(forClass, origSelector)
    let swizzledMethod = class_getInstanceMethod(forClass, withSelector)
    method_exchangeImplementations(originalMethod!, swizzledMethod!)
  }

  func swizzleMethods(origSelector: Selector, withSelector: Selector) {
    let aClass: AnyClass! = object_getClass(self)
    NSObject.swizzleMethods(origSelector: origSelector, withSelector: withSelector, forClass: aClass)
  }
}