Question

简单的问题（是的吧！）。我想在我的UISplitViewController的详细页面上为我的iPad项目添加一个“NEXT”按钮。如果单击，它将是进入页面列表中下一页的另一种方式。作为奖励，我想突出显示根视图中与您登陆的新视图相对应的正确行。

任何关于去哪里的一般指导和建议都很棒！

更新：感谢Anna的建议，下面是我用来将所有这些结合在一起的代码。它工作得很好。谢谢安娜。

在详细信息页面上，我将其包括在内：

- (IBAction)goToNext{
    NSLog(@"Going to Next from Welcome");
    [[NSNotificationCenter defaultCenter]
     postNotificationName:@"NextPageRequested" object:nil];

}

在RootViewController页面上我做了：

- (void)viewDidLoad {
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(moveOnToNextPage:)
     name:@"NextPageRequested" object:nil];
}

最后在RootViewController中：

#pragma mark -
#pragma mark The NEXT Button
// This is the Code used for the Big NEXT button.  basically a Notification Center listener is set up in the view did load and when triggered by any of the buttons, this 
// function is called.  Here, I do 3 things:  1.  advance the highlighted cell of the master table view.  2.  call the didSelectRowAtIndexPath function of the table to 
// advance to the next page.  and 3.  Exchange the "dash" icon with the "check" icon.


-(void)moveOnToNextPage:(NSNotification*)notifications {
    NSIndexPath*    selection = [self.tableView indexPathForSelectedRow]; // grab the row path of the currently highlighted item



// Change the icon in the current row:

    NSString *checkImage = [[NSBundle mainBundle] pathForResource:@"checkGreen" ofType:@"png"];
    UIImage *checkMark = [[[UIImage alloc] initWithContentsOfFile:checkImage] autorelease]; // Grab the checkmark image.
    if (selection) {
        NSLog(@"not nil");
        UITableViewCell *cell1 = [self.tableView cellForRowAtIndexPath:[self.tableView indexPathForSelectedRow]];
        // cell1.accessoryType = UITableViewCellAccessoryCheckmark; // this is yet another way to add the checkmar, but for now, I will use Mine.
        cell1.imageView.image = checkMark; // now set the icon
    } else {
        NSLog(@"must be nil");
        NSUInteger indexArrBlank[] = {0,0}; // now throw this back into the integer set
        NSIndexPath *blankSet = [NSIndexPath indexPathWithIndexes:indexArrBlank length:2]; // create a new index path 
        UITableViewCell *cell0 = [self.tableView cellForRowAtIndexPath:blankSet];
        // cell1.accessoryType = UITableViewCellAccessoryCheckmark; // this is yet another way to add the checkmar, but for now, I will use Mine.
        cell0.imageView.image = checkMark; // now set the icon
    }



// Highlight the new Row
    int nextSelection = selection.row +1; // grab the int value of the row (cuz it actually has both the section and the row {section, row}) and add 1
    NSUInteger indexArr[] = {0,nextSelection}; // now throw this back into the integer set
    NSIndexPath *indexSet = [NSIndexPath indexPathWithIndexes:indexArr length:2]; // create a new index path 
    [self.tableView selectRowAtIndexPath:indexSet animated:YES scrollPosition:UITableViewScrollPositionTop]; // tell the table to highlight the new row

// Move to the new View
    UITableView *newTableView = self.tableView; // create a pointer to a new table View
    [self tableView:newTableView didSelectRowAtIndexPath:indexSet]; // call the didSelectRowAtIndexPath function
    //[newTableView autorelease];  //let the new tableView go.  ok.  this crashes it, so no releasing for now.

}

Answer 1

实现此目的的一种方法是使用NSNotificationCenter。

viewDidLoad中的根视图控制器将调用addObserver:selector:name:object:使自己成为名为@“NextPageRequested”的通知的观察者。

详细视图上的按钮在点击时会调用postNotificationName:object:来请求根视图控制器转到下一页。

在根视图控制器中，通知处理程序方法会（假设根视图控制器是UITableView）：

使用UITableView的indexPathForSelectedRow
计算下一个索引路径
致电selectRowAtIndexPath:animated:scrollPosition:以突出显示该行
调用实际更改页面所需的代码（可能直接调用tableView:didSelectRowAtIndexPath:）

Answer 2

为您的detailviewcontroller提供父导航控制器，并通过导航项将下一个按钮添加到导航栏。按Next将触发pushviewcontroller到nav-stack。

或者将顶部工具栏添加到当前视图控制器并将按钮放在那里。

将NEXT按钮添加到iPad UISplitViewController

2 个答案: