[swift-users] Initializer accessing self

[Brandon Knope]

I am at a loss:

Why does this not work:
class Test {
    let timer: Timer!
    
    init() {
        timer = Timer.scheduledTimer(timeInterval: 20, target: self, selector: #selector(test(_:)), userInfo: nil, repeats: true)
    }
    
    @objc func test(_ timer: Timer) {
        
    }
}

error: constant 'self.timer' used before being initialized
        timer = Timer.scheduledTimer(timeInterval: 20, target: self, selector: #selector(test(_:)), userInfo: nil, repeats: true)

But this does:

class TestTwo {
    var timer: Timer!
    
    init() {
        timer = Timer.scheduledTimer(timeInterval: 20, target: self, selector: #selector(test(_:)), userInfo: nil, repeats: true)
    }
    
    @objc func test(_ timer: Timer) {
        
    }
}
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