我正在尝试更改桌面 View 中的图片。我在另一种方法(正在启动)中使用 [myTableView reloadData]; 来刷新我的 TableView ，我可以看到 tableview 中的其他元素正在刷新，但图像保持不变。我错过了什么？
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UILabel *lblName;
UIImageView *checkMark = [[UIImageView alloc] initWithFrame:CGRectMake(230, 0, 30, 50)];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(10, 1, 260, 70)];
backgroundView.backgroundColor = UIColorFromRGB(0x000000, 0.3);
backgroundView.userInteractionEnabled = YES;
checkMark.image = [UIImage imageNamed:@"V.png"];
checkMark.contentMode = UIViewContentModeCenter;
checkMark.backgroundColor = [UIColor clearColor];
[backgroundView addSubview:checkMark];
[checkMark release];
[cell.contentView addSubview:backgroundView];
[backgroundView release];
}
if (something)
{
checkMark.image = [UIImage imageNamed:@"halfleft.png"];
NSLog(@"something was done");
}
return cell;
}
最佳答案
reloadData 正确调用此方法。
您的问题很简单，在单元格被“重用”的情况下，“checkMark”上的指针不好。做这样的事情:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UIView *backgroundView;
UIImageView *checkMark;
if (cell == nil) {
checkMark = [[UIImageView alloc] initWithFrame:CGRectMake(230, 0, 30, 50)];
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
backgroundView = [[UIView alloc] initWithFrame:CGRectMake(10, 1, 260, 70)];
backgroundView.backgroundColor = UIColorFromRGB(0x000000, 0.3);
backgroundView.userInteractionEnabled = YES;
backgroundView.tag = 555;
checkMark.image = [UIImage imageNamed:@"V.png"];
checkMark.contentMode = UIViewContentModeCenter;
checkMark.backgroundColor = [UIColor clearColor];
checkMark.tag = 666;
[backgroundView addSubview:checkMark];
[checkMark release];
[cell.contentView addSubview:backgroundView];
[backgroundView release];
} else {
backgroundView = (UIImageView *)[cell.contentView viewWithTag:555];
checkMark = (UIImageView *)[backgroundView viewWithTag:666];
}
if (something)
{
checkMark.image = [UIImage imageNamed:@"halfleft.png"];
NSLog(@"something was done");
}
return cell;
}
但是，您应该做一些更简单的事情(如果可能的话，减少 subview 。或者子类 UITableViewCell 以在复选标记上有一个指针;-)
关于ios - 无法刷新 UITableView 内的图片，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14919759/