Created
September 25, 2020 11:18
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import UIKit | |
final class Increment { | |
// MARK: - Properties | |
private var number: Int = 0 | |
// MARK: - This will cause memory leak | |
// lazy var incrementNumber: (Int) -> Void = { value in | |
// self.number += value | |
// print(self.number) | |
// } | |
// MARK: - If I instantiate increment(), then I immediately call increment with a three, the program will crash, because when the stored property has returned, the object (increment instance) can be deallocated, nothing else is referring to it. | |
// lazy var incrementNumber: (Int) -> Void = { [unowned self] value in | |
// self.number += value | |
// print(self.number) | |
// } | |
// MARK: - This will not cause memory leak | |
lazy var incrementNumber: (Int) -> Void = { [weak self] value in | |
guard let self = self else { print("Sorry I am did disappear") ; return } | |
self.number += value | |
print(self.number) | |
} | |
deinit { | |
print(#function) | |
} | |
} | |
// MARK: - Test | |
do { | |
let increment = Increment().incrementNumber(3) | |
} | |
/* | |
deinit | |
Sorry I am did disappear | |
*/ | |
do { | |
let increment = Increment() | |
increment.incrementNumber(3) | |
} | |
/* | |
3 | |
deinit | |
*/ |
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