Escaping Closures
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var completionHandlers: [() -> Void] = []
func someFunctionWithEscapingClosure(completionHandler: @escaping () -> Void) {
completionHandlers.append(completionHandler)
}
func someFunctionWithNonescapingClosure(closure: () -> Void) {
closure()
}
class SomeClass {
var x = 10
func doSomething() {
someFunctionWithEscapingClosure { self.x = 100 }
someFunctionWithNonescapingClosure { x = 200 }
}
}
let instance = SomeClass()
instance.doSomething()
print(instance.x)
// Prints "200"
completionHandlers.first?()
print(instance.x)
// Prints "100"
Swift
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