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[英]iOS application crashes when trying to insert new row in UITableView
[英]Trying to add a new row dynamically to a UITableView in iOS
我在我的應用程序中有一個UITableView,我試圖通過單擊按鈕動態添加行。 當用戶單擊我的按鈕時,將調用以下方法:
- (IBAction)addChoice:(id)sender {
//addRow is a boolean variable that is set so that we can use it to check later and add a new row
if (!self.addRow) {
self.addRow = YES;
}
[self setEditing:YES animated:YES];
}
然后調用:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.choiceTable setEditing:editing animated:animated];
}
問題是,盡管我已經實現了UITableViewDelegate和UITableViewDataSource,但我已經調用了以下任何一個委托方法:
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
if (self.addRow) {
return UITableViewCellEditingStyleInsert;
} else {
return UITableViewCellEditingStyleDelete;
}
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
NSArray *indexPathArray = [NSArray arrayWithObject:indexPath];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[self.tableData removeObjectAtIndex:indexPath.row];
NSArray *indexPathArray = [NSArray arrayWithObject:indexPath];
[tableView deleteRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
NSString *theObjectToInsert = @"New Row";
[self.tableData addObject:theObjectToInsert];
[tableView reloadData];
[tableView insertRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
任何人都可以看到它我做錯了什么?
您需要在表數據數組中插入一行,然后在tableview上調用insertRowsAtIndexPaths
,讓表視圖知道新行。 新行將位於數組的末尾,因此行count-1。
[self.tableData addObject:newObject];
NSIndexPath *newPath=[NSIndexPath indexPathForRow:self.tableData.count-1 inSection:0];
[self.tableView insertRowsAtIndexPaths:@[newPath] withRowAnimation:UITableViewRowAnimationAutomatic];
您應該在UITableView
上執行插入或刪除,如下所示:
[tableView beginUpdates];
// Add object to the array
[self.tableData addObject:theObjectToInsert];
// perform tableView insertion/delete here
[tableView insertRowsAtIndexPaths:indexPathArray withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView endUpdates];
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