The video shows the manager had already darted out the front door, along with the third employee. 'He said, 'I'm going to let you have it unless you tell me,'' the employee said. They held the one employee at gunpoint, demanding to see the manager, who was the only person who could open the store's safe. Surveillance video given to Channel 2 Action News by the store manager shows the men taking over the Family Dollar. After I seen that, I'm hitting the floor,' she said. 'I was straightening up the shelves when a dude with a shotgun came towards me. One employee, who didn't want to be identified, told Channel 2's Tony Thomas she was one of three employees in the store at the time of the crime. Fairburn police said two gunmen burst into the store just before closing time Monday night. The latest holdup occurred in Fairburn, where employees said they knew they were going to get hit because of the recent rash of crimes. Employees at some of the stores said they've been told of even more holdups. Police tell Channel Two Action News there have been at least seven robberies at the retail chain since late November. In the below example self is captured as unowned instead of weakĪs the self-captured as unowned, the self is not an option and hence? (Question mark) can’t be used.FAIRBURN, Ga.,None - A string of armed robberies at metro Atlanta Family Dollar stores has employees worried, and the chain is insisting it is taking all the precautions it can. If accessing an object captured as unowned and the object is nil, a run time error will generate.

Just like weak, unowned does not increase the retain cycle, but the object can’t be nil.Unowned should only be used where one is sure the object won’t be nil. Unowned behaves similarly to weak, but both are not the same. Hence it can be nil and treated as on Optional. As the reference count might be zero when nothing holds a strong reference to this object, it might be de-allocated. You must be wondering about the ? (question mark) after self. This square bracket is called a capture list. Just after the opening of curly braces at the declaration of m圜losure, inside the square bracket, weak self () is written, which means self is captured as weak, followed by in keyword. In the below example, the self-captured as weak. As the retain count is not increased using weak, the object can be de-allocated by ARC. It doesn’t increase the retain count or reference count. Hence it’s reference count is increased by 1 and won’t get de-allocated causing a memory leak.Ī weak reference is just a pointer that points to an object. In the above example, callFunction() referred strongly. As long as an object whose reference count or retain count is greater than 0, that object won’t get de-allocated by ARC.

Capturing variable means that the referred object will not be non-allocated from memory because the count of the reference or the count of an object can be increased by 1. Let’s discuss the strong reference first. To avoid reference cycle, we need to be captured variables as weak or unowned. In this example Test class has a strong reference to m圜losure and m圜losure closure captures self strongly by calling callFunction(). The below example shows how a strong retain cycle is created using a closure. Since closures in Swift are a reference type, a retain cycle can create, especially when self-captured within it. Swift handles all of the memory management of capturing for you. It is known as closing over those constants and variables. Closures in Swift are similar to blocks in C and Objective-C and lambdas in other programming languages.Ī closure can capture and store references to any constants and variables from the context in which they defined. ClosuresĬlosures are self-contained blocks of functionality that can be passed around and used in your code. In most cases, Swift memory management works automatically. It uses the concept called Automatic Reference Counting (or simply ARC) which allows it to manage the memory. Swift is a modern, high-level programming language which automatically manages much of the memory of the iOS applications, which means it allocates and de-allocates memory on its own.

Swiftcapture