如何在swift ios中创建自定义UIAlertController？

问题描述

我正在努力使UIAlertController看起来像这样：

I am trying to make UIAlertController that looks like this:

我们如何定制UIAlertController以获得与此图片相同的结果？

How can we customize the UIAlertController to get the result something same as this picture ?

推荐答案

你想要的是什么do是一个popover，对于当前版本的iOS，你可以为iPad和iPhone实现相同的效果。

What you are trying to do is a popover, for current versions of iOS you can achieve the same effect for both iPad and iPhone.

1.-首先在Storyboard或xib上构建你的设计。然后引用它。

1.- Start by building your design on Storyboard or a xib. and then reference it.

2.-然后将其作为弹出窗口显示。

2.- then present it as a popover.

3.-也许你想要实现popoverdelegates旋转设备时避免错误的位置。

3.- maybe you will want to implement popoverdelegates to avoid wrong positions when rotating the device.

例如：

  private static func presentCustomDialog(parent: UIViewController) -> Bool {
        /// Loads your custom from its xib or from Storyboard
        if let rateDialog = loadNibForRate() {
            rateDialog.modalPresentationStyle = UIModalPresentationStyle.Popover
            rateDialog.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve
            let x = parent.view.center

            let sourceRectX : CGFloat

            let maximumDim = max(UIScreen.mainScreen().bounds.height, UIScreen.mainScreen().bounds.width)
            if maximumDim == 1024 { //iPad
                sourceRectX = x.x
            }else {
                sourceRectX = 0
            }

            rateDialog.popoverPresentationController?.sourceView = parent.view
            rateDialog.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.allZeros
            rateDialog.popoverPresentationController?.sourceRect = CGRectMake(sourceRectX, x.y, 0, 0)
            rateDialog.popoverPresentationController?.popoverLayoutMargins = UIEdgeInsetsMake(0, 0, 0, 0)
            rateDialog.popoverPresentationController?.delegate = parent

            rateDialogParent = parent

            dispatch_async(dispatch_get_main_queue(), {
                parent.presentViewController(rateDialog, animated: true, completion: nil)
            })
            return true
        }
        return false
    }

public class MyParentViewController: UIViewController, UIPopoverPresentationControllerDelegate {
    /**
    This function guarantees that the CustomDialog is always centered at parent, it locates the Dialog view
     */
    public func popoverPresentationController(popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverToRect rect: UnsafeMutablePointer<CGRect>, inView view: AutoreleasingUnsafeMutablePointer<UIView?>) {
        let x = popoverPresentationController.presentingViewController.view.center
        let newRect = CGRectMake(x.x, x.y, 0, 0)
        rect.initialize(newRect)
    }

}

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