将模态视图放在视图上并使背景变为灰色 [英] Putting a modal view over a view and making the background grey

问题描述

最近3个小时我一直在尝试完成此操作，但我不知道如何执行此操作.谁能帮忙吗?

I have been trying to accomplish this for the last 3 hours and I could not figure out how to do this. Could anyone PLEASE help?

这就是我想要做的.当我按下一个按钮(例如Sign In按钮)时，我希望弹出一个模式视图，使其后面的视图变为灰色且无法应用.在此模式视图中，我需要几个按钮和静态标签.

So this is what I am trying to do. When I press a button, say, a Sign In button, I want a modal view to pop up that make the view behind it grey and untappable. And on this modal view, I want several button and static labels.

我已经阅读并试图理解一些资源，例如: http://makeapppie.com/2014/08/30/the-swift-swift-tutorials-adding-modal-views-and-popovers/，<一个href ="https://stackoverflow.com/questions/25223607/how-to-use-modal-views-in-swift">如何快速使用模式视图?，还有其他几个.但是，我很难理解代码.

I've read and tried to understand several resources already such as: Present modal view controller in half size parent controller, http://makeapppie.com/2014/08/30/the-swift-swift-tutorials-adding-modal-views-and-popovers/, How to use modal views in swift?, and several others. However, I have such a hard time understanding the code.

到目前为止，我已经有了这段代码，该代码应该使模态视图位于其后面的视图之上:

So far I have this code which is supposed to make the modal view be on top of the view behind it:

@IBAction func signIn(sender: AnyObject) {
    self.modalTransitionStyle = UIModalTransitionStyle.CoverVertical
    // Cover Vertical is necessary for CurrentContext
    self.modalPresentationStyle = .CurrentContext
    // Display on top of    current UIView
    self.presentViewController(SignInViewController(), animated: true, completion: nil)
}

但是，这并没有产生我想要的效果.有人帮忙吗?

But this isn't producing the effect that I want. Anybody please help?

推荐答案

首先，创建灰色的空视图

First, create your gray empty view

func makeGrayView() -> UIView {
    var view = UIView(frame:UIScreen.mainScreen().applicationFrame)
    self.view.backgroundColor = UIColor.greyColor()
    return view
}

第二，将刚刚创建的视图设置为叠加层的背景

Second, set the view you just created as a background of your overlay

var backView = self.makeGrayView()
self.view.addSubview(backView)

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