选择行后设置变量的值并添加复选标记（xcode）
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Set value of variable after selecting row and add checkmark (xcode)
提问by TomasJ
I'd like to do following: After clicking a row in a tableview, I want to set value of some variable and in the same time change the cell accessory type to checkmark. Here is my implementation file:
我想执行以下操作：单击 tableview 中的一行后，我想设置某个变量的值，同时将单元格附件类型更改为复选标记。这是我的实现文件：
- (void)viewDidLoad
{
[super viewDidLoad];
tabledata = [[NSArray alloc] initWithObjects:@"row1", @"row2", @"row3", nil];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - TableView Data Source methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tabledata count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:@"Row"];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Row"];
}
cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
return cell;
}
#pragma mark TableVoew Delegate methods
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//if row1 is selected change 'value' to 1 and change cell accessory to checkmark (other cells accessory to none)
//if row2 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
//if row3 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
}
采纳答案by Pulkit Goyal
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.value = indexPath.row;
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:nowIndex];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
EDITSet only the accessory for selected row in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
编辑仅设置所选行的附件- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
cell.accessoryType = UITableViewAccessoryNone;
if (indexPath.row == self.value) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
See thisto remove checkmarks from currently visible cells in tableview.
请参阅此内容以从 tableview 中当前可见的单元格中删除复选标记。
EDIT 2To unselect the previous row, do this in didSelectRowAtIndexPath
编辑 2要取消选择上一行，请在didSelectRowAtIndexPath
NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:index inSection:1];
NSLog(@"Oldindexpath is: %@", oldIndexPath);
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
if (newCell.accessoryType == UITableViewCellAccessoryNone) {
newCell.accessoryType = UITableViewCellAccessoryCheckmark;
}
UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:oldIndexPath];
if (oldCell != newCell){
if (oldCell.accessoryType == UITableViewCellAccessoryCheckmark) {
oldCell.accessoryType = UITableViewCellAccessoryNone;
}
}
回答by TomasJ
This solved my problem with removing old checkmarks:
这解决了我删除旧复选标记的问题：
for (UITableViewCell *cell in [tableView visibleCells]) {
cell.accessoryType = UITableViewCellAccessoryNone;
}
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
and problem with setting value of current row was solved in previous answer.
设置当前行值的问题在之前的答案中已解决。
