#坑1# iOS8以后presendViewController透明效果无效

来源：互联网发布：sql注入单引号原理编辑：程序博客网时间：2024/06/05 11:59

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

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