{"id":3205,"date":"2021-06-11T23:22:18","date_gmt":"2021-06-11T17:22:18","guid":{"rendered":"https:\/\/touhidapps.com\/learn\/?p=3205"},"modified":"2024-04-07T11:07:45","modified_gmt":"2024-04-07T05:07:45","slug":"swift-weak-self","status":"publish","type":"post","link":"https:\/\/touhidapps.com\/learn\/swift-weak-self\/","title":{"rendered":"Swift [weak self], weak – \u09b8\u09c1\u0987\u09ab\u099f \u09b2\u09cd\u09af\u09be\u0999\u09cd\u0997\u09c1\u09df\u09c7\u099c\u09c7 weak self \u098f\u09ac\u0982 weak variable \u098f\u09b0 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0"},"content":{"rendered":"\n

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import UIKit\n\nclass ViewController: UIViewController {\n    \n    override func viewDidLoad() {\n        super.viewDidLoad()\n        \n        let alert = UIAlertController(title: \"My Title\",\n                                      message: \"Hello this is a message\",\n                                      preferredStyle: .alert)\n        alert.addAction(UIAlertAction(title: \"Done\",\n                                      style: .cancel,\n                                      handler: { [weak self]<\/span> _ in\n\/\/ Null check as self can be null here as we use weak self\n                                        guard let mSelf = self else { return }\n\/\/ as myFunction() calls from ViewController object which is self, if not use [weak self] it will\n\/\/ keep a strong reference with ViewController and will not destroy after dismiss UIAlertController\n                                        mSelf.myFunction()\n                                        \n                                      }))\n\n        \n    } \/\/ viewDidLoad\n    \n    private func myFunction() {\n        \n    }\n\n}<\/code><\/pre>\n\n\n\n
\u0989\u09aa\u09b0\u09c7\u09b0 \u0995\u09cb\u09a1\u09c7 \u09a6\u09c7\u0996\u09a4\u09c7 \u09aa\u09be\u099a\u09cd\u099b\u09bf \u098f\u0995\u099f\u09bf \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997 viewDidLoad() \u098f\u09b0 \u09ad\u09bf\u09a4\u09b0 \u09b0\u09df\u09c7\u099b\u09c7\u0964 \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997 \u09af\u0996\u09a8 \u09a1\u09bf\u09b8\u09ae\u09bf\u09b8 \u09b9\u09ac\u09c7 \u09a4\u0996\u09a8 myFunction() \u0995\u09b2 \u09b9\u09ac\u09c7\u0964 myFunction() \u09b0\u09df\u09c7\u099b\u09c7 ViewController \u098f\u09b0 \u09ad\u09bf\u09a4\u09b0 \u09af\u09be \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997\u09c7\u09b0 \u09ad\u09bf\u09a4\u09b0\u09c7 self \u09a6\u09bf\u09df\u09c7 \u0995\u09b2 \u0995\u09b0\u09be \u09b9\u09df\u0964 <\/p>\n\n\n\n
\u09af\u0996\u09a8 \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997 \u09a1\u09bf\u09b8\u09ae\u09bf\u09b8 \u0995\u09b0\u09be \u09b9\u09ac\u09c7 \u09a4\u0996\u09a8 self \u098f\u09b0 \u099c\u09a8\u09cd\u09af \u09af\u09be\u09a4\u09c7 \u09ae\u09c7\u09ae\u09cb\u09b0\u09bf \u09a5\u09c7\u0995\u09c7 \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09ae\u09c1\u099b\u09c7 \u09ac\u09be \u09a1\u09bf\u098f\u09b2\u09cb\u0995\u09c7\u099f \u09b9\u09df\u09c7 \u09af\u09c7\u09a4\u09c7 \u09ac\u09be\u09a7\u09be\u0997\u09cd\u09b0\u09b8\u09cd\u09a5 \u09a8\u09be \u09b9\u09df \u09b8\u09c7 \u099c\u09a8\u09cd\u09af weak self \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u09b9\u09df\u09c7\u099b\u09c7\u0964 \u098f\u0996\u09a8 \u098f\u09b2\u09be\u09b0\u09cd\u099f \u09a1\u09be\u09df\u09b2\u0997 \u09a1\u09bf\u09b8\u09ae\u09bf\u09b8 \u09b9\u09b2\u09c7 \u098f\u09b2\u09be\u09b0\u09cd\u099f \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09ae\u09c7\u09ae\u09cb\u09b0\u09bf \u09a5\u09c7\u0995\u09c7 \u09ae\u09c1\u099b\u09c7 \u09af\u09be\u09ac\u09c7\u0964<\/p>\n\n\n\n
\u098f\u09ac\u09be\u09b0 \u09a8\u09bf\u099c\u09c7\u09b0 \u09a4\u09c8\u09b0\u09bf \u0995\u09cd\u09b2\u09cb\u099c\u09be\u09b0\u09c7 weak self \u098f\u09b0 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u09a6\u09c7\u0996\u09bf:<\/strong><\/p>\n\n\n\n
import UIKit\n\nclass ViewController: UIViewController {\n    \n    private var data: Data?\n    \n    override func viewDidLoad() {\n        super.viewDidLoad()\n        \n        getData(string: \"\") { [weak self]<\/span> (data) in\n            self?.data = data\n        }\n        \n    } \/\/ viewDidLoad\n    \n    private func getData(string: String, completion: ((Data?) -> Void)) {\n        \n        completion(nil)\n        \n    }\n\n}<\/code><\/pre>\n\n\n\n
\u09b9\u09df\u09a4\u09cb \u0987\u09a8\u09cd\u099f\u09be\u09b0\u09a8\u09c7\u099f \u098f\u09aa\u09bf\u0986\u0987 \u0995\u09b2 \u0995\u09bf\u0982\u09ac\u09be \u09ac\u09a1\u09bc \u0985\u09aa\u09be\u09b0\u09c7\u09b6\u09a8 \u099a\u09be\u09b2\u09bf\u09df\u09c7 \u0995\u09cd\u09b2\u09cb\u099c\u09be\u09b0 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7 \u09a4\u09be\u09b0 \u09b0\u09c7\u099c\u09be\u09b2\u09cd\u099f \u09aa\u09c7\u09a4\u09c7 \u099a\u09be\u099a\u09cd\u099b\u09c7\u09a8\u0964 \u09a4\u0996\u09a8 \u09af\u09a6\u09bf \u098f\u09b0\u0995\u09ae \u0995\u09cd\u09b2\u09cb\u099c\u09be\u09b0\u09c7 self \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09c7\u09b0 \u09aa\u09cd\u09b0\u09df\u09cb\u099c\u09a8 \u09b9\u09df \u09a4\u09ac\u09c7 weak self \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09b2\u09c7 \u0995\u09cd\u09b2\u09cb\u099c\u09be\u09b0\u09c7\u09b0 \u0995\u09be\u099c \u09b6\u09c7\u09b7 \u09b9\u09b2\u09c7 \u09ae\u09c7\u09ae\u09cb\u09b0\u09bf \u09a5\u09c7\u0995\u09c7 \u09ae\u09c1\u099b\u09c7 \u09af\u09be\u09ac\u09c7 \u098f\u09a4\u09c7 \u09ae\u09c7\u09ae\u09cb\u09b0\u09bf \u0996\u09be\u09b2\u09bf \u09b9\u09df\u09c7 \u098f\u09cd\u09af\u09be\u09aa\u09c7\u09b0 \u09aa\u09be\u09b0\u09ab\u09b0\u09ae\u09c7\u09a8\u09cd\u09b8 \u0995\u09ae\u09bf\u09df\u09c7 \u09a6\u09bf\u09ac\u09c7 \u09a8\u09be\u0964<\/p>\n\n\n\n
\u09a1\u09c7\u09b2\u09bf\u0997\u09c7\u099f\u09c7\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 weak \u098f\u09b0 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u09a6\u09c7\u0996\u09bf:<\/strong><\/p>\n\n\n\n
import UIKit\n\nprotocol MyViewControllerDelegate: AnyObject {\n    func myAction()\n}\n\nclass ViewController: UIViewController {\n\n    weak<\/span> var delegate: MyViewControllerDelegate?\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n\n        \n    } \/\/ viewDidLoad\n    \n\n} \/\/ ViewController\n\n\/\/ Another ViewController or class\nclass AnotherVC: UIViewController, MyViewControllerDelegate {\n    \n    private let vc = ViewController()\n    \n    override func viewDidLoad() {\n        super.viewDidLoad()\n\n        \/\/ If this class destroy then MyViewControllerDelegate will destroy too if use weak\n        vc.delegate = self<\/span>\n        \n    } \/\/ viewDidLoad\n    \n    func myAction() {\n        \/\/\n    }\n    \n}<\/code><\/pre>\n\n\n\n
\u098f\u0996\u09be\u09a8\u09c7 \u09a1\u09c7\u09b2\u09bf\u0997\u09c7\u099f\u09c7\u09b0 \u09b0\u09c7\u09ab\u09be\u09b0\u09c7\u09a8\u09cd\u09b8\u09c7 \u098f\u09cd\u09af\u09be\u09b8\u09be\u0987\u09a8 \u0995\u09b0\u09be \u09b9\u09df\u09c7\u099b\u09c7 self \u098f\u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 weak \u09ad\u09c7\u09b0\u09bf\u09df\u09c7\u09ac\u09b2 \u09b9\u09bf\u09b8\u09c7\u09ac\u09c7 \u09a1\u09c7\u09b2\u09bf\u0997\u09c7\u099f \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f \u09a8\u09c7\u09df\u09be \u09b9\u09df\u09c7\u099b\u09c7\u0964<\/p>\n\n\n\n
\u09af\u0996\u09a8 \u0986\u09ae\u09b0\u09be \u09ac\u09a1\u09bc \u0995\u09cb\u09a8 \u09aa\u09cd\u09b0\u099c\u09c7\u0995\u09cd\u099f \u0995\u09b0\u09ac\u09cb \u09a4\u0996\u09a8 \u098f\u0987\u09b0\u0995\u09ae \u09ad\u09be\u09ac\u09c7 \u09ae\u09c7\u09ae\u09cb\u09b0\u09bf \u09ae\u09cd\u09af\u09be\u09a8\u09c7\u099c\u09ae\u09c7\u09a8\u09cd\u099f \u0995\u09b0\u09be \u0989\u099a\u09bf\u09a4 \u098f\u09a4\u09c7 \u098f\u09cd\u09af\u09be\u09aa\u09c7\u09b0 \u09aa\u09be\u09b0\u09ab\u09b0\u09ae\u09c7\u09a8\u09cd\u09b8 \u09a0\u09bf\u0995 \u09a5\u09be\u0995\u09ac\u09c7\u0964 \u099b\u09cb\u099f \u09aa\u09cd\u09b0\u099c\u09c7\u0995\u09cd\u099f\u09c7\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7 \u09a4\u09c7\u09ae\u09a8 \u0995\u09cb\u09a8 \u09b8\u09ae\u09b8\u09cd\u09af\u09be \u09a8\u09c7\u0987 \u09a4\u09ac\u09c7 \u09ac\u09bf\u09b7\u09df\u099f\u09be\u09a4\u09c7 \u0985\u09ad\u09cd\u09af\u09b8\u09cd\u09a4 \u09a5\u09be\u0995\u09be\u09b0 \u099c\u09a8\u09cd\u09af \u09b9\u09b2\u09c7\u0993 \u098f\u0987\u09a7\u09b0\u09a3\u09c7\u09b0 \u09ac\u09bf\u09b7\u09df\u0997\u09c1\u09b2\u09cb \u0985\u09a8\u09c1\u09b8\u09b0\u09a8 \u0995\u09b0\u09be \u0989\u099a\u09bf\u09a4 \u09af\u09be\u09a4\u09c7 \u09ac\u09a1\u09bc \u09aa\u09cd\u09b0\u099c\u09c7\u0995\u09cd\u099f \u0995\u09b0\u09be\u09b0 \u09b8\u09ae\u09df \u09ad\u09c1\u09b2\u09c7 \u09a8\u09be \u09af\u09be\u0987\u0964<\/p>\n","protected":false},"excerpt":{"rendered":"
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