我正在寻找一种从多个视图控制器调用自定义警报视图的方法.到目前为止,我做了几次不同的尝试但没有成功.

>我创建了一个带有界面构建器的警报视图,它可以在一个视图控制器上正常工作
>然后我尝试以编程方式创建警报视图,认为它可能与未在其他视图控制器上连接的插座有关.这个也适用于一个视图控制器而不是另一个.
>我创建了一个单独的swift文件,并创建了一个公共函数和相同的结果.使用这最后一种方法,我能够在多个视图控制器上成功重用常规UIAlertController,但这并不是我想要的.

使用前两种方法,我没有得到任何编译错误.应用程序运行正常,然后当我从另一个视图控制器调用警报时崩溃.

提前感谢任何输入！

编辑：

当我输入另一个swift文件时,此示例有效.

public func showSimpleAlert(title: String, message: String?, presentingController: UIViewController) {

if IS_OS_8_OR_LATER() {
    let controller = UIAlertController(title: title, message: message, preferredStyle: .Alert)

    controller.addAction(UIAlertAction(title: "OK", style: .Cancel, handler: { (action) -> Void in

    }))

    presentingController.presentViewController(controller, animated: true, completion: nil)
} else {
    let alert = UIAlertView(title: title, message: message, delegate: nil, cancelButtonTitle: "OK")
    alert.show()
}

}

这是我想要工作的人.

public func showAlert(oMsg: String, oTitle:String) {
    alertView.backgroundColor = UIColor.whiteColor()
    alertView.layer.cornerRadius = 25

    alertTitleLabel.text = oTitle as String
    alertTitleLabel.font = UIFont(name: "Open-Sans-Bold", size: 20)
    alertTitleLabel.textColor = UIColor.blackColor()
    alertTitleLabel.textAlignment = .Center
    alertTitleLabel.numberOfLines = 1
    alertTitleLabel.frame = CGRectMake(25, 60, 264, 112)

    alertLabel.text = oMsg as String
    alertLabel.font = UIFont(name: "Open-Sans", size: 20)
    alertLabel.textColor = UIColor.blackColor()
    alertLabel.textAlignment = .Center
    alertLabel.numberOfLines = 4
    alertLabel.frame = CGRectMake(25, 130, 264, 112)

    okButton.setTitle("OK", forState: .Normal)
    okButton.setTitleColor(UIColor.blueColor(), forState: .Normal)
    okButton.frame = CGRectMake(60, 230, 197, 75)
    okButton.addTarget(UIViewController.self, action:#selector(LoginViewController.buttonAction(_:)), forControlEvents: .TouchUpInside)

}

最佳答案 我将给出一个简单的自定义alertview的答案,它基本上是一个修改过的uiviewcontroller.您可以使用uiviewcontroller作为uialertviewcontroller,如下所示.

简单的AlertView ::

AlertVC：

import UIKit

class ErrorAlert: UIViewController {
    var titlenote:String = ""
    var message:String = ""

    @IBOutlet weak var cancelBtn: UIButton!
    @IBOutlet weak var messageHolder: UILabel!

    @IBOutlet weak var imageHolder: UIImageView!
    @IBOutlet weak var titleHolder: UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor =  UIColor.black.withAlphaComponent(0.7)
        // Do any additional setup after loading the view.
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.messageHolder.text = self.message
        self.titleHolder.text = self.titlenote

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func dismiss(_ sender: Any) {
        self.dismiss(animated: true, completion: nil)
    }


}

这个viewcontroller可以在任何vc中重复使用多次.

用法示例::

let alertController = self.storyboard?.instantiateViewController(withIdentifier: "erroralert") as! ErrorAlert
                alertController.titlenote = "Invalid login"
                alertController.message = "Invalid facebook account."
                alertController.providesPresentationContextTransitionStyle = true
                alertController.definesPresentationContext = true
                alertController.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
                alertController.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
                self.present(alertController, animated: true, completion: nil)

我通过设置alpha值来制作alertviewvc半透明的背景.

实际显示::

您可以通过此方法制作更复杂的警报视图,但为了可重用性,您已应用一些逻辑,因为不同的viewcontroller按钮操作将不同.示例 – 有时您可以使用alertview进行注销警报或某些时候提交表单.因此,在这两种情况下,操作都会有所不同,因此为了可重用性,您必须编写额外的逻辑.

另一个alertView ::

我希望我的回答能帮助你.:)