xcode UITableView 中的复选标记
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原文地址: http://stackoverflow.com/questions/6058233/
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Checkmarks in a UITableView
提问by miniHsieh
I create a tableview with 20 cells.
And when I select first row, it will show checkmark on it.
我创建了一个包含 20 个单元格的 tableview。
当我选择第一行时，它会在上面显示复选标记。
But when I scroll tableview, then it not only one checkmark on tableview cell.
It also show on another cell.
但是当我滚动 tableview 时，它不仅是 tableview 单元格上的一个复选标记。
它也显示在另一个单元格上。
What's the problem with this?
这有什么问题？
self.dataAry = [NSArray arrayWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16",@"17",@"18",@"19",nil];
marks = [NSMutableArray new];
for (int i = 0 ; i < [self.dataAry count]; i++) {
[marks addObject:@"NO"];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [dataAry objectAtIndex:indexPath.row];
if ([[marks objectAtIndex:indexPath.row] isEqualToString:@"YES"]) {
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}else {
[cell setAccessoryType:UITableViewCellAccessoryNone];
}
// Configure the cell.
return cell;}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *thisCell = [tableView cellForRowAtIndexPath:indexPath];
if ([[tableView cellForRowAtIndexPath:indexPath] accessoryType] == UITableViewCellAccessoryCheckmark){
[[tableView cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryNone];
[selectArray removeObject:[self.dataAry objectAtIndex:indexPath.row]];
[marks replaceObjectAtIndex:indexPath.row withObject:@"NO"];
}
else {
[[tableView cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryCheckmark];
[selectArray addObject:[self.dataAry objectAtIndex:indexPath.row]];
[marks replaceObjectAtIndex:indexPath.row withObject:@"YES"];
}
}
回答by LuisRdF
I think it is due to reusing the checkmarked cell. To correct that, write this:
我认为这是由于重用了选中标记的单元格。要纠正这一点，请写下：
*if ([[marks objectAtIndex:indexPath.row] isEqualToString:@"YES"]) {
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}else {
[cell setAccessoryType:UITableViewCellAccessoryNone];*
Out of cell reusing space. That is After: ... } //Configure the cell.
超出单元重用空间。即 After: ... } //配置单元格。
just before
就在之前
*return cell;*
回答by nambi
Try this. Here selectedRow is an integer .Assign selectedRow = -1 in viewDidLoad.
尝试这个。这里 selectedRow 是一个整数。在 viewDidLoad 中分配 selectedRow = -1。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
int row = [indexPath row];
cell.accessoryType = (row == selectedRow) ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
selectedRow = [indexPath row];
[tableView reloadData];
}
回答by Narayanan Ramamoorthy
check this
检查这个
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *thisCell = [tableView cellForRowAtIndexPath:indexPath];
if (thisCell.accessoryType == UITableViewCellAccessoryNone) {
thisCell.accessoryType = UITableViewCellAccessoryCheckmark;
}else{
thisCell.accessoryType = UITableViewCellAccessoryNone;
}
}
- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath {
//add your own code to set the cell accesory type.
return UITableViewCellAccessoryNone;
}
回答by tmr
i faced same issue. for me, solution was adding a single line of code.
我面临同样的问题。对我来说，解决方案是添加一行代码。
cell.accessoryType = UITableViewCellAccessoryNone;
adding the above code after:
添加上面的代码后：
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
this solution may not be useful for coder who posted the question, but may help new folks like me who face same issue as raised by the original quesiton.
此解决方案对于发布问题的编码人员可能没有用，但可以帮助像我这样面临与原始问题提出的相同问题的新人。
