即使在单独的线程上，Swift 也无法与页面交互

Question

我刚开始使用单独的线程。我想我做错了。我试图让这个动画发生，但允许用户在其发生时与页面交互。

这是我的代码

let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
    dispatch_async(dispatch_get_global_queue(priority, 0)) {
        UIView.animateWithDuration(3.0, animations: {
            self.backgroundView.layer.backgroundColor = UIColor(red: 25.0/255.0, green: 25.0/255.0, blue: 25.0/255.0, alpha: 1.0).CGColor
        })

        dispatch_async(dispatch_get_main_queue()) {
            self.backgroundView.layer.backgroundColor = UIColor(red: 25.0/255.0, green: 25.0/255.0, blue: 25.0/255.0, alpha: 1.0).CGColor
        }
    }

Answer 1

感谢@Rob 的回答。

Animations must take place on the main thread. If you want to allow user interaction, use the .AllowUserInteraction option in animationWithDuration:delay:options:animations:completions