如何跳转到detailview中的下一行

Question

我有一个TableView,它在didSelectRow中加载了一个detailview.我对数据没有任何问题.我正在使用coreData并填充TableView我正在使用NSFetchedResultsController.

现在,我想在detailView中创建next和previous函数以跳转到下一个或上一个Table(row)元素.像Mail-App中的Next Previous.
我知道我必须使用带有IBAction的按钮.

但是我怎么能做到这个功能呢？

谢谢,
brush51

编辑1: 我做到了这样:

- (IBAction) previousCard:(id) sender {  
    NSLog(@"previousBtn");

DashboardViewController *parent = (DashboardViewController *)self.parentViewController;

NSIndexPath *actualIndexPath = selectedRow2;
NSIndexPath * newIndexPath = [NSIndexPath  indexPathForRow:actualIndexPath.row-1 inSection:actualIndexPath.section];
NSLog(@"newIndexPath: %@", newIndexPath);
[parent.tableViews selectRowAtIndexPath:newIndexPath animated:YES scrollPosition:UITableViewScrollPositionMiddle]; //HERE I GET SIGABRT

}

但我得到一个错误:

-[UIViewController tableViews]: unrecognized selector sent to instance 0xd758ae0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController tableViews]: unrecognized selector sent to instance 0xd758ae0'  

怎么解决这个？

Answer 1

使用UITableView,您可以通过以下方式获取所选行:

- (NSIndexPath *)indexPathForSelectedRow

并通过递增indexPath.row来设置选择:

- (void)selectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UITableViewScrollPosition)scrollPosition

然后你的行动可能是:

-(IBAction)nextCell:(id)sender {
  NSIndexPath * actualIndexPath = myTableView.indexPathForSelectedRow;
  NSIndexPath * newIndexPath = [NSIndexPath  indexPathForRow:actualIndexPath.row+1 inSection:actualIndexPath.section];
  [myTableView selectRowAtIndexPath:newIndexPath animated:YES scrollPosition:UITableViewScrollPositionMiddle];
}