标签: uialertcontroller

我一直在努力在Swift中创建一个UIAlertView,但由于某些原因我无法正确获取该声明,因为我收到此错误:

找不到接受提供的参数的'init'的重载

这是我写的方式:

let button2Alert: UIAlertView = UIAlertView(title: "Title", message: "message",
                     delegate: self, cancelButtonTitle: "OK", otherButtonTitles: nil)

然后打电话给我我正在使用:

button2Alert.show()

截至目前它正在崩溃,我似乎无法使语法正确.

场景:用户点击视图控制器上的按钮.视图控制器是导航堆栈中最顶层的(显然).tap会调用另一个类上调用的实用程序类方法.在那里发生了一件坏事,我希望在控制返回到视图控制器之前在那里显示警报.

+ (void)myUtilityMethod {
    // do stuff
    // something bad happened, display an alert.
}

这是可能的UIAlertView(但可能不太合适).

在这种情况下,你如何呈现一个UIAlertController,就在那里myUtilityMethod？

在iOS 8.0中,Apple引入了UIAlertController来取代UIActionSheet.不幸的是,Apple没有添加任何有关如何呈现它的信息.我在hayaGeek的博客上找到了一个关于它的条目,然而,它似乎不适用于iPad.视图完全错位:

放错了地方:

正确:

我使用以下代码在界面上显示它:

    let alert = UIAlertController()
    // setting buttons
    self.presentModalViewController(alert, animated: true)

还有其他方法可以将它添加到iPad吗？或者苹果只是忘了iPad,还是没有实现？

我正在使用新的UIAlertController来显示警报.我有这个代码:

// nil titles break alert interface on iOS 8.0, so we'll be using empty strings
UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @"": title message: message preferredStyle: UIAlertControllerStyleAlert];


UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle style: UIAlertActionStyleCancel handler: nil];

[alert addAction: defaultAction];

UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
[rootViewController presentViewController:alert animated:YES completion:nil];

现在我想更改标题和消息字体,颜色,大小等.什么是最好的方法呢？

编辑: 我应该插入整个代码.我为UIView创建了一个类别,我可以为iOS版本显示正确的警报.

@implementation UIView (AlertCompatibility)

+( void )showSimpleAlertWithTitle:( NSString * )title
                          message:( NSString * )message
                cancelButtonTitle:( NSString * )cancelButtonTitle
{
    float iOSVersion = [[UIDevice currentDevice].systemVersion floatValue]; …

我尝试了几种方法来使用UIAlertController而不是UIAlertView.我尝试了几种方法,但我无法使警报行动起作用.这是我的代码在IOS 8和IOS 9中正常工作,但是出现了弃用的标志.我尝试了下面的优雅建议,但我无法在此背景下使其发挥作用.我需要提交我的应用程序,这是最后要解决的问题.感谢您的任何进一步建议.我是新手.

#pragma mark - BUTTONS ================================
- (IBAction)showModesAction:(id)sender {
NSLog(@"iapMade: %d", iapMade3);

// IAP MADE ! ===========================================
if (!iapMade3) {

    //start game here
    gamePlaysCount++;
    [[NSUserDefaults standardUserDefaults]setInteger:gamePlaysCount forKey:@"gamePlaysCount"];
    NSLog(@"playsCount: %ld", (long)gamePlaysCount);

    if (gamePlaysCount >= 4) {
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Basic"
                                                     message: THREE_PLAYS_LIMIT_MESSAGE
                                                    delegate:self
                                           cancelButtonTitle:@"Yes, please"
                                           otherButtonTitles:@"No, thanks", nil];
       [alert show];

        NSString *path = [[NSBundle mainBundle] pathForResource:@"cow" ofType:@"wav"];
        _pop =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
        [_pop play];
        [self dismissViewControllerAnimated:true completion:nil];

    } else {
        if (gamePlaysCount == 1)  {
            // Create …

我有一个tableview,当加载时,每个单元格可能会返回一个NSError,我已经选择在UIAlertController中显示它.问题是如果返回多个错误,我会在控制台中收到此错误.

警告:尝试在MessagesMasterVC上呈现UIAlertController:0x14e64cb00:0x14e53d800已经呈现(null)

理想情况下,我希望在我的UIAlertController扩展方法中处理这个问题.

class func simpleAlertWithMessage(message: String!) -> UIAlertController {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    let cancel = UIAlertAction(title: "Ok", style: .Cancel, handler: nil)

    alertController.addAction(cancel)
    return alertController
}

基于matt的答案,我将扩展名更改为UIViewController扩展,更加清晰,并节省了大量的presentViewController代码.

    func showSimpleAlertWithMessage(message: String!) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    let cancel = UIAlertAction(title: "Ok", style: .Cancel, handler: nil)

    alertController.addAction(cancel)

    if self.presentedViewController == nil {
        self.presentViewController(alertController, animated: true, completion: nil)
    }
}

我正在尝试使用输入发出警报消息,然后从输入中获取值.我发现了很多很好的教程如何制作输入文本字段.但我无法从警报中获得价值.

我正在向UIAlertView用户展示一个,我无法弄清楚如何编写处理程序.这是我的尝试:

let alert = UIAlertController(title: "Title",
                            message: "Message",
                     preferredStyle: UIAlertControllerStyle.Alert)

alert.addAction(UIAlertAction(title: "Okay",
                              style: UIAlertActionStyle.Default,
                            handler: {self in println("Foo")})

我在Xcode中遇到了很多问题.

文件说 convenience init(title title: String!, style style: UIAlertActionStyle, handler handler: ((UIAlertAction!) -> Void)!)

目前整个街区/封闭都有点过头了.任何建议都非常感谢.

我试图UIAlertController用a表示UITextView.当我添加行:

    //Add text field
    alertController.addTextFieldWithConfigurationHandler { (textField) -> Void in
    }        

我收到一个Runtime错误:

致命错误:在展开Optional值时意外发现nil

    let alertController: UIAlertController = UIAlertController(title: "Find image", message: "Search for image", preferredStyle: .Alert)

    //cancel button
    let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { action -> Void in
        //cancel code
    }
    alertController.addAction(cancelAction)

    //Create an optional action
    let nextAction: UIAlertAction = UIAlertAction(title: "Search", style: .Default) { action -> Void in
        let text = (alertController.textFields?.first as! UITextField).text
        println("You entered \(text)")
    }
    alertController.addAction(nextAction)

    //Add …

在iOS 12.2上。使用UIAlertController的actionSheet Xcode时，遇到此问题的人都会遇到约束错误

相同的代码在iOS 12.1上运行，没有错误

我已经在Xcode 10.2和10.1上测试了此代码

class ViewController: UIViewController {

    let Click : UIButton = {
        let button = UIButton(type: UIButton.ButtonType.system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("OK", for: .normal)
        button.tintColor = UIColor.blue
        button.addTarget(self, action: #selector(click(_:)), for: UIControl.Event.touchUpInside)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(Click)
        Click.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        Click.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    }


    @objc func click(_ sender: UIButton) {
        let optionMenu = UIAlertController(title: nil, message: "Choose Option", preferredStyle: .actionSheet)

        let deleteAction = UIAlertAction(title: "Delete", style: .default)
        let saveAction = …