［已解决］swift中UIViewController设置背景色为clear但是却还是显示黑色

代码：

   override func viewDidLoad() {

        super.viewDidLoad()

        gLog.verbose("self.view.frame=\(self.view.frame)")

        self.view.frame = CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, SwitchListHeight)

        gLog.verbose("self.view.frame=\(self.view.frame)")

        self.view.backgroundColor = UIColor.clearColor()

//        self.view.backgroundColor = nil

        gLog.verbose("self.view.backgroundColor=\(self.view.backgroundColor)")

        //self.view.backgroundColor=Optional(UIDeviceWhiteColorSpace 0 0)

    }

结果：

2016-05-27 15:56:12.078 [Verbose] [main] [SwitchListTableViewController.swift:53] viewDidLoad() > self.view.frame=(0.0, 0.0, 320.0, 568.0)

2016-05-27 15:56:12.079 [Verbose] [main] [SwitchListTableViewController.swift:55] viewDidLoad() > self.view.frame=(0.0, 0.0, 320.0, 88.0)

2016-05-27 15:56:12.081 [Verbose] [main] [SwitchListTableViewController.swift:60] viewDidLoad() > self.view.backgroundColor=Optional(UIDeviceWhiteColorSpace 0 0)

显示出黑色，而不是透明色：

swift uiviewcontroller background clear but show black

iphone – Display clearColor UIViewController over UIViewController – Stack Overflow

改为：

        let switchCustomerTypeListVC = SwitchListTableViewController(titleList: ["我的客户", "已交车客户"])

        switchCustomerTypeListVC.view.backgroundColor = UIColor.clearColor()

        gLog.verbose("self.modalPresentationStyle=\(self.modalPresentationStyle)")

        self.modalPresentationStyle = .CurrentContext

        gLog.verbose("self.modalPresentationStyle=\(self.modalPresentationStyle)")

        self.presentViewController(switchCustomerTypeListVC, animated: true, completion: nil)

问题依旧。

改为：

        let switchCustomerTypeListVC = SwitchListTableViewController(titleList: ["我的客户", "已交车客户"])

        switchCustomerTypeListVC.view.backgroundColor = UIColor.clearColor()

        gLog.verbose("switchCustomerTypeListVC.modalPresentationStyle=\(switchCustomerTypeListVC.modalPresentationStyle)")

        switchCustomerTypeListVC.modalPresentationStyle = .CurrentContext

        gLog.verbose("switchCustomerTypeListVC.modalPresentationStyle=\(switchCustomerTypeListVC.modalPresentationStyle)")

        self.presentViewController(switchCustomerTypeListVC, animated: true, completion: nil)

有点效果了：

至少是状态栏和导航栏是，clear显示出来的了

但是还是有问题

并且去点击的话，还是可以点击到的。。。

改为：

        let switchCustomerTypeListVC = SwitchListTableViewController(titleList: ["我的客户", "已交车客户"])

        switchCustomerTypeListVC.view.backgroundColor = UIColor.clearColor()

        gLog.verbose("switchCustomerTypeListVC.modalPresentationStyle=\(switchCustomerTypeListVC.modalPresentationStyle)")

        //switchCustomerTypeListVC.modalPresentationStyle = .CurrentContext

        switchCustomerTypeListVC.modalPresentationStyle = .OverCurrentContext

        gLog.verbose("switchCustomerTypeListVC.modalPresentationStyle=\(switchCustomerTypeListVC.modalPresentationStyle)")

        self.presentViewController(switchCustomerTypeListVC, animated: true, completion: nil)

终于可以完整显示透明的了：

ios – Swift UIView background color opacity – Stack Overflow

http://stackoverflow.com/questions/27439220/swift-uiview-background-color-opacity

uiviewcontroller – ModalViewController transparent background iOS 8 – Stack Overflow

ios – Swift Modal View Controller with transparent background – Stack Overflow

objective c – iOS: Modal ViewController with transparent background – Stack Overflow

iphone – Display clear colored ViewController over another ViewController in iOS 7 – Stack Overflow

［总结］

好像主要就是：

将要显示出来的VC的modalPresentationStyle，设置为UIModalPresentationStyle.OverCurrentContext

就可以了。

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