我目前正致力于在UITableViewCell内部实现inline UIDate picker。
当我选择应该插入该单元格的正上方的单元格时,我能够显示和隐藏此选择器单元格,这是我期望的行为。但是,如果我在表格视图中选择任何其他单元格,则应用程序崩溃:
*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UITableView.m:1582
在查看accepted answer to this SO question之后,我添加了一个例外断点,我发现该应用在[tableView endUpdates];
中didSelectRowAtIndexPath
的来电时崩溃了:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
// Check to see if the "Only Alert From" row was selected. The cell with the picker should be below this one.
if (indexPath.section == TimeOfDaySection && indexPath.row == HourTimeZoneRow && self.timePickerIsShowing == NO){
[tableView beginUpdates];
[self showTimePicker];
[tableView endUpdates];
} else{
[tableView beginUpdates];
[self hideTimePicker];
[tableView endUpdates];
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
那就是说,我不知道该怎么办。如果我注释掉[tableView endUpdates];
的调用,则在选择其他单元格时应用程序不会崩溃,但是具有选择器视图的单元格将不会隐藏。有没有人有什么建议?谢谢!
编辑:以下是我的showTimePicker
和hideTimePicker
代码:
- (void)showTimePicker
{
self.timePickerIsShowing = YES;
self.timePicker.hidden = NO;
//Create the index path where we insert the cell with the picker
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection];
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
self.timePicker.alpha = 0.0f;
[UIView animateWithDuration:0.25 animations:^{
self.timePicker.alpha = 1.0f;
//This is the row where the picker cell should be inserted
[self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection]] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView reloadData];
}];
}
- (void)hideTimePicker {
self.timePickerIsShowing = NO;
self.timePicker.hidden = YES;
//Create the index path where we delete the cell with the picker
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:HourTimeZoneRow + 1 inSection:TimeOfDaySection];
[self.tableView beginUpdates];
//Delete the picker row
[self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
[UIView animateWithDuration:0.25
animations:^{
self.timePicker.alpha = 0.0f;
}
completion:^(BOOL finished){
self.timePicker.hidden = YES;
}];
}
编辑2:阅读this SO thread后,我认为问题可能出在我的numberOfRowsInSection
方法上:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
switch (section) {
case NotificationsSection:
return TotalPreferencesRows;
break;
case RedZoneSection:
return TotalRedZoneRows;
break;
case TimeOfDaySection:
if (self.timePickerIsShowing) {
return TotalTimeOfDayRows + 1;
}
// else if (self.timePickerIsShowing == NO){
// return TotalTimeOfDayRows;
// }
else{
return TotalTimeOfDayRows;
}
return TotalTimeOfDayRows;
break;
default:
return 0;
break;
}
}
答案 0 :(得分:2)
不确定这是否是崩溃的来源,但不建议多次调用beginUpdates你正在做什么
[tableView beginUpdates];
[self showTimePicker];
[tableView endUpdates];
因为showTimePicker调用[self.tableView beginUpdates];
答案 1 :(得分:2)
问题出在你的didSelectRowAtIndexPath中,你调用了hide方法,即使它可能没有显示。将else
子句变为else if
,如下所示:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
// Check to see if the "Only Alert From" row was selected. The cell with the picker should be below this one.
if (indexPath.section == TimeOfDaySection && indexPath.row == HourTimeZoneRow && self.timePickerIsShowing == NO){
[tableView beginUpdates];
[self showTimePicker];
[tableView endUpdates];
} else if (indexPath.section == TimeOfDaySection && indexPath.row == HourTimeZoneRow && self.timePickerIsShowing == YES){
[tableView beginUpdates];
[self hideTimePicker];
[tableView endUpdates];
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}