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updateSwitchAtIndexPath崩溃

uiswitch uitableview objective-c

user1256477 · 技术社区 · 13 年前

我在一些单元格中有一个UITableView和UISwitch。

我想捕捉事件,但当我尝试添加indexPath时,它会崩溃。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

 //Create cell with all data

    UISwitch *switchview = [[UISwitch alloc] initWithFrame:CGRectZero];
    cell.accessoryView = switchview;
    [switchview addTarget:self action:@selector(updateSwitchAtIndexPath) forControlEvents:UIControlEventTouchUpInside];
}


- (void)updateSwitchAtIndexPath:(NSIndexPath *)indexPath {

   UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
   UISwitch *switchView = (UISwitch *)cell.accessoryView;

   if ([switchView isOn]) {
       NSLog(@"ON");
   } else {
       NSLog(@"OFF");
   }

}

它崩溃了,我想是因为我没有添加indexPath参数,但我不知道如何设置它。

 -[ParkingData updateSwitchAtIndexPath]: unrecognized selector sent to instance 0x7b88eb0

谢谢

3 回复 | 直到 13 年前

Mil0R3 13 年前

更新

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

 //Create cell with all data

    UISwitch *switchview = [[UISwitch alloc] initWithFrame:CGRectZero];
    cell.accessoryView = switchview;
    [switchview addTarget:self action:@selector(updateSwitchAtIndexPath:) forControlEvents:UIControlEventTouchUpInside];
}


- (void)updateSwitchAtIndexPath:(UISwitch *)switchview {
   if ([switchView isOn]) {
       NSLog(@"ON");
   } else {
       NSLog(@"OFF");
   }

}

janusfidel 13 年前

[switchview addTarget:self action:@selector(updateSwitchAtIndexPath) forControlEvents:UIControlEventTouchUpInside];

应该是

[switchview addTarget:self action:@selector(updateSwitchAtIndexPath:) forControlEvents:UIControlEventTouchUpInside];

你只缺了一个冒号。因为你的方法有参数。

- (void)updateSwitchAtIndexPath:(NSIndexPath *)indexPath

quetzalcoatl 13 年前

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UISwitch *switchview = [[UISwitch alloc] initWithFrame:CGRectZero];
    cell.accessoryView = switchview;
    [switchview addTarget:self action:@selector(updateSwitchAtIndexPath:) forControlEvents:UIControlEventTouchUpInside];
}

- (void)updateSwitchAtIndexPath:(id)sender
{
   // see the line BELOW
   NSIndexPath *indexPath = [[(UITableView*)[sender superview] superview]indexPathForCell: (UITableViewCell*)[sender superview]];

    if ([sender isOn])
        NSLog(@"ON");
    else
        NSLog(@"OFF");
}

在上面的代码发送器意味着UISwitch,如果你想要单元格的indexPath,那么标记的行对你有帮助。