How to swizzle NSError init without hitting an infinite loop

Multi tool use
Multi tool use












0















How to call the original NSError init method when swizzling?



My current implementation



 extension NSError {

@objc class func errorSwizzle() {
guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
method_exchangeImplementations(instance, swizzleInstance)
}

@objc class func errorUnSwizzle() {
guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
method_exchangeImplementations(swizzleInstance, instance)
}

@objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {

/// infinite loop as it calls the swizzled init again.
self.init(domain: swizzleDomain, code: code, userInfo: info)

/// Do something..
}
}









share|improve this question



























    0















    How to call the original NSError init method when swizzling?



    My current implementation



     extension NSError {

    @objc class func errorSwizzle() {
    guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
    let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
    method_exchangeImplementations(instance, swizzleInstance)
    }

    @objc class func errorUnSwizzle() {
    guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
    let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
    method_exchangeImplementations(swizzleInstance, instance)
    }

    @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {

    /// infinite loop as it calls the swizzled init again.
    self.init(domain: swizzleDomain, code: code, userInfo: info)

    /// Do something..
    }
    }









    share|improve this question

























      0












      0








      0








      How to call the original NSError init method when swizzling?



      My current implementation



       extension NSError {

      @objc class func errorSwizzle() {
      guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
      let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
      method_exchangeImplementations(instance, swizzleInstance)
      }

      @objc class func errorUnSwizzle() {
      guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
      let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
      method_exchangeImplementations(swizzleInstance, instance)
      }

      @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {

      /// infinite loop as it calls the swizzled init again.
      self.init(domain: swizzleDomain, code: code, userInfo: info)

      /// Do something..
      }
      }









      share|improve this question














      How to call the original NSError init method when swizzling?



      My current implementation



       extension NSError {

      @objc class func errorSwizzle() {
      guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
      let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
      method_exchangeImplementations(instance, swizzleInstance)
      }

      @objc class func errorUnSwizzle() {
      guard let instance = class_getInstanceMethod(self, #selector(NSError.init(domain:code:userInfo:))),
      let swizzleInstance = class_getInstanceMethod(self, #selector(NSError.init(swizzleDomain:code:info:))) else { return }
      method_exchangeImplementations(swizzleInstance, instance)
      }

      @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {

      /// infinite loop as it calls the swizzled init again.
      self.init(domain: swizzleDomain, code: code, userInfo: info)

      /// Do something..
      }
      }






      ios swift nserror method-swizzling






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      asked Dec 31 '18 at 12:11









      Tal ZionTal Zion

      3,0662244




      3,0662244
























          1 Answer
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          2














          You have exchanged the implementations, that means you have to call:



          @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {
          self.init(swizzleDomain: swizzleDomain, code: code, info: info)
          }


          Because self.init(swizzleDomain:...) will contain the original initializer.






          share|improve this answer


























          • Thanks, @Sulthan, just found my issue as well and posted that as an answer

            – Tal Zion
            Dec 31 '18 at 12:25











          Your Answer






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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          You have exchanged the implementations, that means you have to call:



          @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {
          self.init(swizzleDomain: swizzleDomain, code: code, info: info)
          }


          Because self.init(swizzleDomain:...) will contain the original initializer.






          share|improve this answer


























          • Thanks, @Sulthan, just found my issue as well and posted that as an answer

            – Tal Zion
            Dec 31 '18 at 12:25
















          2














          You have exchanged the implementations, that means you have to call:



          @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {
          self.init(swizzleDomain: swizzleDomain, code: code, info: info)
          }


          Because self.init(swizzleDomain:...) will contain the original initializer.






          share|improve this answer


























          • Thanks, @Sulthan, just found my issue as well and posted that as an answer

            – Tal Zion
            Dec 31 '18 at 12:25














          2












          2








          2







          You have exchanged the implementations, that means you have to call:



          @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {
          self.init(swizzleDomain: swizzleDomain, code: code, info: info)
          }


          Because self.init(swizzleDomain:...) will contain the original initializer.






          share|improve this answer















          You have exchanged the implementations, that means you have to call:



          @objc convenience init(swizzleDomain: String, code: Int, info: [String : Any]?) {
          self.init(swizzleDomain: swizzleDomain, code: code, info: info)
          }


          Because self.init(swizzleDomain:...) will contain the original initializer.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Dec 31 '18 at 12:24

























          answered Dec 31 '18 at 12:17









          SulthanSulthan

          96.2k16156201




          96.2k16156201













          • Thanks, @Sulthan, just found my issue as well and posted that as an answer

            – Tal Zion
            Dec 31 '18 at 12:25



















          • Thanks, @Sulthan, just found my issue as well and posted that as an answer

            – Tal Zion
            Dec 31 '18 at 12:25

















          Thanks, @Sulthan, just found my issue as well and posted that as an answer

          – Tal Zion
          Dec 31 '18 at 12:25





          Thanks, @Sulthan, just found my issue as well and posted that as an answer

          – Tal Zion
          Dec 31 '18 at 12:25




















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