Question

我还是iOS新手，在我正在开发的应用中，当用户从外部源导入文件时，会显示此视图。我希望只有在用户在操作表中确认后才执行导入，分层结构如下：

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rootview被设置回来。

我想要的是询问用户是否真的想在progressView显示时立即导入，如果不是，则必须取消它（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：以下是我尝试使用操作表的内容：

//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;
    }

//显示操作表

- (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个方法（我似乎无法调用app委托中的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import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;
}

Answer 1

您应该在方法中创建并显示UIActionsheet，但不要执行任何当前代码。您应该将所有当前代码移动到另一个方法，如果用户在委托方法actionSheet:willDismissWithButtonIndex:中点击了正确的按钮，则应该调用该方法。

Answer 2

无论采取什么操作触发，-handleImportURL:的来电都应该创建一个UIActionSheet并显示它。

如果是按钮，例如：

-(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];
    }
}

iOS：要求用户在启动调度队列请求之前通过ActionSheet进行确认

2 个答案: