Created
April 12, 2019 16:57
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Swift way to create an autoweak closure (No more retain cycle/memory leak)
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// From this | |
didFinishLoading = { [weak self] in | |
guard let self = self else { return } | |
self.tableView.reloadData() | |
} | |
// To this | |
didFinishLoading = weaker(self) { s in | |
// No more boilerplate code :) | |
s.tableView.reloadData() | |
} |
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/// Create an autoweak closure (No param) | |
/// | |
/// - Parameters: | |
/// - object: Any object we want to break the retain cycle (Autoweak) | |
/// - closure: New callback to execute | |
func weaker<Object: AnyObject>(_ object: Object?, closure: @escaping (Object) -> Void) -> () -> Void { | |
return { [weak object] in | |
guard let safeObject = object else { return } | |
closure(safeObject) | |
} | |
} | |
/// Create an autoweak closure (1 param) | |
/// | |
/// - Parameters: | |
/// - object: Any object we want to break the retain cycle (Autoweak) | |
/// - closure: New callback to execute | |
func weaker<Object: AnyObject, Param1>(_ object: Object?, closure: @escaping (Object, Param1) -> Void) -> (Param1) -> Void { | |
return { [weak object] param1 in | |
guard let safeObject = object else { return } | |
closure(safeObject, param1) | |
} | |
} | |
/// Create an autoweak closure (2 params) | |
/// | |
/// - Parameters: | |
/// - object: Any object we want to break the retain cycle (Autoweak) | |
/// - closure: New callback to execute | |
func weaker<Object: AnyObject, Param1, Param2>(_ object: Object?, closure: @escaping (Object, Param1, Param2) -> Void) -> (Param1, Param2) -> Void { | |
return { [weak object] param1, param2 in | |
guard let safeObject = object else { return } | |
closure(safeObject, param1, param2) | |
} | |
} | |
/// Create an autoweak closure (3 params) | |
/// | |
/// - Parameters: | |
/// - object: Any object we want to break the retain cycle (Autoweak) | |
/// - closure: New callback to execute | |
func weaker<Object: AnyObject, Param1, Param2, Param3>(_ object: Object?, closure: @escaping (Object, Param1, Param2, Param3) -> Void) -> (Param1, Param2, Param3) -> Void { | |
return { [weak object] param1, param2, param3 in | |
guard let safeObject = object else { return } | |
closure(safeObject, param1, param2, param3) | |
} | |
} |
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