ios - 设置 ?没有名为 Generator 的成员

Question

我发现很难修复这个错误请谁能帮助我xcode 7 测试版 2

Set UITouch ? does not have a member named Generator

      override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
        for obj in touches {
            if let touch = obj as? UITouch {
                let view = self.touchToView[touch]

                self.handleControl(view, controlEvent: .TouchCancel)

                self.touchToView[touch] = nil
            }
        }

    }
}

enter image description here

Answer 1

你需要打开可选的 - 尝试

for obj in touches! {
   // code here
}