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我还是 iOS 新手,在我正在开发的应用程序中,当用户从外部源导入文件时,会显示此视图。我希望仅在用户确认在操作表中执行导入后,层次结构如下:

  • 用户从他的电子邮件中选择在应用程序中打开文件。

  • 然后,他切换到progressView(在导入过程中以编程方式成为根视图)。

  • 该过程完成并且默认的根视图被设置回来。

我想要的是询问用户是否真的想在progressView显示后立即导入,如果不是他必须取消它(我不知道该怎么做)

谢谢,

这是功能:

- (void)handleImportURL:(NSURL *)url
{



    __block JASidePanelController * controller = (JASidePanelController *)self.window.rootViewController;

    // Show progress window
    UIStoryboard * storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

    __block PVProgressViewController * progressController = [storyboard instantiateViewControllerWithIdentifier:@"kProgressViewController"];


    self.window.rootViewController = progressController;
     // I think here somethings needs to be done with UIActionsheet       
    // Perform import operation
    dispatch_async(dispatch_get_global_queue(0, 0), ^{

        NSError *outError;
        NSString * csvString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&outError];
        NSArray * array = [csvString csvRows];
        [[PVDatabaseController sharedController] importArray:array progressHandler:^(float progress) {
            progressController.progressBar.progress = progress;
        }];

        dispatch_async(dispatch_get_main_queue(), ^{
            self.window.rootViewController = controller;
        });
    });
}

更新:所以这是我尝试对操作表执行的操作:

//First the function that calls the handleImport
    -(BOOL) application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
    {
        // Handle CSV Import
        if (url != nil && [url isFileURL]) {
            [self handleImportURL:url];
            [self confirmImportAlert];

        }
        return YES;
    }

//显示动作表

- (void)confirmImportAlert {
    UIActionSheet *myActionSheet = [[UIActionSheet alloc] initWithTitle:@"Proceed through Import?" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Yes", @"Maybe", nil];
    [myActionSheet showInView: self.window];
}

// what to do 
    -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
        if(buttonIndex == 0){
            // Avoid Import
        }
        else{
            [self handleImportURL:_importURL];

            //initiate import
        }
    }

更新2:所以我添加并更改了两种方法(我似乎无法在应用程序委托中调用 ActionSheetWilldismiss 函数):

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

    NSString *choice = [ actionSheet buttonTitleAtIndex:buttonIndex];
    if(buttonIndex == 0){
        //initiate import
        [self handleImportURL:_importURL];
    }
    else{
        //don't initiate import
    }
}

//This methods creats the action sheet
    - (void)confirmImportAlert {
        // importActionSheet is a property in the appdelegate.h

        if (!self.importActionSheet){
            UIActionSheet *myActionSheet = [[UIActionSheet alloc] initWithTitle:@"Proceed through Import?" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Yes", nil];
            [myActionSheet showInView: self.window];
            myActionSheet.delegate = self;

            self.importActionSheet = myActionSheet;
        }


    }

并将调用导入的函数更改为:

-(BOOL) application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
    // Handle CSV Import
    if (url != nil && [url isFileURL]) {

        [self confirmImportAlert];
        //[self handleImportURL:url];



    }
    return YES;
}
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2 回答 2

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您应该UIActionsheet在您的方法中创建和显示,但不要执行您拥有的任何当前代码。您当前拥有的所有代码都应移至另一个方法,如果用户在委托方法中点击了正确的按钮,则应调用该方法actionSheet:willDismissWithButtonIndex:

于 2013-08-16T09:30:27.357 回答
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无论什么动作触发了调用,-handleImportURL:都应该创建 aUIActionSheet并显示它。

例如,如果它是一个按钮:

-(void)buttonTapped:(UIButton *)sender
{
    // [self handleImportURL:someURL];
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil
                                                             delegate:self
                                                    cancelButtonTitle:@"Cancel"
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:@"Confirm",nil];
    [actionSheet showInView:self.view];
}

然后你需要实现委托方法:

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (actionSheet.cancelButtonIndex != buttonIndex) {
        [self handleImportURL:someURL];
    }
}
于 2013-08-16T09:33:24.577 回答