在新部分的表视图中插入一行

问题描述

我从一个只有一个部分的表视图开始，第一部分总是有三行.下载了一些内容之后，我想在第二部分中显示一个新的单元格，所以我可以这样做:

I start with a tableview with one section, the first section always has three rows. After some content has downloaded, I want show a new cell, in a second section, so I do :

[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationNone];

但是我得到一个NSInternalConsistencyException:

But I get an NSInternalConsistencyException:

为什么不自动插入新节，如果我确实插入了节，那么在插入不在新节中的行时会遇到问题.

Why isn't it inserted the new section automatically, If I do insert a section, then I get problems when inserting rows that are not in new sections.

为什么不能仅自动添加新部分?当然，InsertRowAtIndexpath:必要时还包括插入一个节，因为NSIndexPath也包括一个节.

Why can't it just add the new section automatically? surely InsertRowAtIndexpath: also include inserting a section if necessary as an NSIndexPath also includes a section.

推荐答案

[self.tableView insertSections:nsIndexSetToInsert withRowAnimation:UITableViewRowAnimationAutomatic];

并且不要忘记相应地设置numberOfSectionsInTavleView和numberOfRowsInSection.

and don't forget to set numberOfSectionsInTavleView and numberOfRowsInSection accordingly.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    NSInteger numberOfSections;
    if (condition1) {
        numberOfSections = 2;
    } else if (condition2) {
        numberOfSections = 3;
    } else {
        numberOfSections = 4;
    }

    return numberOfSections;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section
    if(section == 1) return 3;
    else return numberOfRows;
}

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