如何删除最后一行并在表格视图中添加更多行？

Question

tableview的最后一行有一个按钮，当按下它时，我希望该行中的按钮消失，同时添加更多行，然后按钮再次出现在最后一行。 但我不知道怎么做！ 这是我的代码：

- (void)morePicture:(id)sender{
NSMutableArray *indexpath = [[NSMutableArray alloc] init];
[photos removeObjectAtIndex:[photos count]-1];
[indexpath addObject:[NSIndexPath indexPathForRow:[photos count]+1 inSection:0]];
[table beginUpdates];
[table deleteRowsAtIndexPaths:indexpath withRowAnimation:UITableViewRowAnimationNone];

NSMutableArray *indexPathss = [[NSMutableArray alloc] init];
for(int i=0; i<3; i++){
    NSString *s = [[NSString alloc] initWithFormat:@"%d",i];
    [photos addObject:s];
    NSIndexPath *indexpath = [NSIndexPath indexPathForRow:i inSection:0];
    [indexPathss addObject:indexpath];
}

Answer 1

您不需要调用deleteRowsAtIndexPaths 方法。请改用insertRowsAtIndexPaths。只需在最后一行按钮上方添加行，不要删除它！

NSArray *newPhotos = ....;
NSMutableArray *photos = ...;

// insert new photos first (before table update)
[photos insertObjects:newPhotos atIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange([photos count] - 1, [newPhotos count])];

NSMutableArray *newIndices = [NSMutableArray array];
for (NSInteger row = [photos count] - [newPhotos count] - 1; row < [photos count] - 1; row++) {
    [newIndices addObject:[NSIndexPath indexPathWithIndex:row];
}
[self.tableView insertRowsAtIndexPaths:newIndices withRowAnimation:UITableViewRowAnimationFade];

Answer 2

UIButton *moreButton = [[UIButton alloc] initWithFrame:frame];

[moreButton setImage:[UIImage imageNamed:@"button_signin.png"] forState:UIControlStateNormal];

[moreButton addTarget:self action:@selector(showMoreRows) forControlEvents:UIControlEventTouchUpInside];

// 将按钮添加到表格页脚视图

self.tableView.tableFooterView = moreButton;

在方法中

-(IBAction) showMoreRows {

//在数组中添加对象，该对象负责创建表视图，然后调用

[self.tableView reloadData];

}