addTarget:action:forControlEvents - TableView中的UISwitch - 发送者ok,事件总是0x0

Question

使用此论坛中的精彩帖子,我在tableView中创建了一个switchView作为accessoryView.当触摸开关时,我的动作(switchChanged)被调用.只有发送方具有有效值,事件为0x0.

将目标添加到switchView:

        [switchView addTarget:self action:@selector(switchChanged:forEvent:) forControlEvents:(UIControlEventValueChanged | UIControlEventTouchDragInside)];

那个行动:

- (void) switchChanged:(id)sender forEvent:(UIEvent *)event {
  if(event) {
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:[[[event touchesForView:sender] anyObject] locationInView:self.tableView]];
    IFDFlightlogFormQuestions *question = [self.resultsController objectAtIndexPath:indexPath];
    NSLog(@"IFDNewFlightlogViewController_Pad:switchChanged Switch is %@ xmlAttrib %@",[sender isOn],question.XmlAttrib);
    [self.xmlResults setValue:([sender isOn])?@"true":@"false" forKey:question.XmlAttrib];
  }
}

使用action:@selector(switchChanged: forEvent:)- 增加空间 - 没有变化.

使用action:@selector(switchChanged::)- 删除forEvent- 无法识别的选择器.

我的目标是将indexPath放到tableView中,这样我就可以更改字典中的值.

我目前的解决方法是仅使用发件人信息,但我想要事件信息:

- (void) switchChanged:(id)sender forEvent:(UIEvent *)event {
    UISwitch *switchView = (UISwitch *)sender;
    UITableViewCell *cell = (UITableViewCell *)switchView.superview;
    UITableView *tableView = (UITableView *)cell.superview;
    NSIndexPath *indexPath = [tableView indexPathForCell:cell];
    IFDFlightlogFormQuestions *question = [self.resultsController objectAtIndexPath:indexPath];
    NSLog(@"IFDNewFlightlogViewController_Pad:switchChanged Switch is %@ xmlAttrib %@",([sender isOn])?@"On":@"Off",question.XmlAttrib);
    [self.xmlResults setValue:([sender isOn])?@"true":@"false" forKey:question.XmlAttrib];        
}

有关获取此事件信息的任何指示？

Answer 1

可以@selector通过向目标添加目标来触发UISwitch.

[switchCtl addTarget:self action:@selector(action:) forControlEvents:UIControlEventValueChanged];