本文出自
http://mokai.github.io/2015/10/ios-bug-viewcontroller_translucent/
iOS弹出的视图背景默认是黑色,如果想去掉,以往我们使用 self.modalPresentationStyle = .CurrentContext
就可以实现效果,如以下半透明的代码
let vc = UIViewController()
vc.view.backgroundColor = UIColor(red:0.000 , green:0.000 , blue:0.000, alpha:0.5)
self.modalPresentationStyle = .CurrentContext
self.presentViewController(vc, animated: true, completion: nil)
但是你会发现这段代码在iOS8、iOS9上面运行依旧一片黑,因此iOS8以后得这么干
let vc = UIViewController()
vc.view.backgroundColor = UIColor(red:0.000 , green:0.000 , blue:0.000, alpha:0.5)
if let version = Float(UIDevice.currentDevice().systemVersion) where version >= 8{
vc.modalPresentationStyle = .OverCurrentContext //注意此处是弹出VC对象,不是self
}else{
self.modalPresentationStyle = .CurrentContext
}
self.presentViewController(vc, animated: true, completion: nil)
iOS8后增加了OverCurrentContext
取代CurrentContext
,并且设置的对象是弹出的VC