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class_copyPropertyList not working in Swift 5. Whats the reason?

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0

class_copyPropertyList is giving empty properties in Swift 5 and it was working correct in Swift 3

 extension NSObject 

 func toDictionary(from classType: NSObject.Type) -> [String: Any] 

 var propertiesCount : CUnsignedInt = 0
 let propertiesInAClass = class_copyPropertyList(classType, &propertiesCount)
 let propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

 for i in 0 ..< Int(propertiesCount) 
 let property = propertiesInAClass?[i]
 let strKey = NSString(utf8String: property_getName(property)) as String?
 if let key = strKey 
 propertiesDictionary.setValue(self.value(forKey: key), forKey: key)
 
 
 return propertiesDictionary as! [String : Any]
 
 

// call this for NSObject subclass

 let product = Product()
 let dict = product.toDictionary(from: Product.self)
 print(dict)

ios objective-c swift iphone mirror

share|improve this question

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Probably due to NSObject @objc inference deprecation. You'll want to mark the stored properties as @objc, or if you want all members (including methods) exposed to Obj-C, mark the class as @objcMembers. See for example stackoverflow.com/q/44390378/2976878
  
  – Hamish
  Mar 26 at 18:55
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unrelated, but there's no need to pass in the classType parameter, you can use type(of: self) instead. Also note that you need to call free(propertiesInAClass) before the end of the method to prevent a memory leak.
  
  – Hamish
  Mar 26 at 19:01
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how can we get property list by using type of
  
  – Aditya Sharma
  Mar 26 at 19:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  class_copyPropertyList(type(of: self), &propertiesCount)
  
  – Hamish
  Mar 26 at 19:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  po class_copyPropertyList(type(of: User.self), &count) error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0). The process has been returned to the state before expression evaluation.
  
  – Aditya Sharma
  Mar 26 at 19:05
  

  
  
  
  

 | 
show 2 more comments

0

class_copyPropertyList is giving empty properties in Swift 5 and it was working correct in Swift 3

 extension NSObject 

 func toDictionary(from classType: NSObject.Type) -> [String: Any] 

 var propertiesCount : CUnsignedInt = 0
 let propertiesInAClass = class_copyPropertyList(classType, &propertiesCount)
 let propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

 for i in 0 ..< Int(propertiesCount) 
 let property = propertiesInAClass?[i]
 let strKey = NSString(utf8String: property_getName(property)) as String?
 if let key = strKey 
 propertiesDictionary.setValue(self.value(forKey: key), forKey: key)
 
 
 return propertiesDictionary as! [String : Any]
 
 

// call this for NSObject subclass

 let product = Product()
 let dict = product.toDictionary(from: Product.self)
 print(dict)

ios objective-c swift iphone mirror

share|improve this question

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Probably due to NSObject @objc inference deprecation. You'll want to mark the stored properties as @objc, or if you want all members (including methods) exposed to Obj-C, mark the class as @objcMembers. See for example stackoverflow.com/q/44390378/2976878
  
  – Hamish
  Mar 26 at 18:55
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unrelated, but there's no need to pass in the classType parameter, you can use type(of: self) instead. Also note that you need to call free(propertiesInAClass) before the end of the method to prevent a memory leak.
  
  – Hamish
  Mar 26 at 19:01
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how can we get property list by using type of
  
  – Aditya Sharma
  Mar 26 at 19:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  class_copyPropertyList(type(of: self), &propertiesCount)
  
  – Hamish
  Mar 26 at 19:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  po class_copyPropertyList(type(of: User.self), &count) error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0). The process has been returned to the state before expression evaluation.
  
  – Aditya Sharma
  Mar 26 at 19:05
  

  
  
  
  

 | 
show 2 more comments

class_copyPropertyList is giving empty properties in Swift 5 and it was working correct in Swift 3

 extension NSObject 

 func toDictionary(from classType: NSObject.Type) -> [String: Any] 

 var propertiesCount : CUnsignedInt = 0
 let propertiesInAClass = class_copyPropertyList(classType, &propertiesCount)
 let propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

 for i in 0 ..< Int(propertiesCount) 
 let property = propertiesInAClass?[i]
 let strKey = NSString(utf8String: property_getName(property)) as String?
 if let key = strKey 
 propertiesDictionary.setValue(self.value(forKey: key), forKey: key)
 
 
 return propertiesDictionary as! [String : Any]
 
 

// call this for NSObject subclass

 let product = Product()
 let dict = product.toDictionary(from: Product.self)
 print(dict)

ios objective-c swift iphone mirror

share|improve this question

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

 extension NSObject 

 func toDictionary(from classType: NSObject.Type) -> [String: Any] 

 var propertiesCount : CUnsignedInt = 0
 let propertiesInAClass = class_copyPropertyList(classType, &propertiesCount)
 let propertiesDictionary : NSMutableDictionary = NSMutableDictionary()

 for i in 0 ..< Int(propertiesCount) 
 let property = propertiesInAClass?[i]
 let strKey = NSString(utf8String: property_getName(property)) as String?
 if let key = strKey 
 propertiesDictionary.setValue(self.value(forKey: key), forKey: key)
 
 
 return propertiesDictionary as! [String : Any]
 
 

 let product = Product()
 let dict = product.toDictionary(from: Product.self)
 print(dict)

share|improve this question

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

share|improve this question

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges

asked Mar 26 at 18:50

Aditya SharmaAditya Sharma

30122 silver badges1515 bronze badges