我在自定义UIButton内以编程方式创建了UITableViewCell，单元格内UIButtons的编号是动态的，起初它看起来很完美，但是当我打开所有折叠的单元格时并滚动表格视图UIButton相互重叠，如果我滚动更多，屏幕外的UIButton隐藏，当你回到屏幕区域时，图像看起来像是什么。
我不在这里发布代码，因为它很大，我不知道我应该在这里包含哪一部分。如果被问到，我会在这里发布该特定代码。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
InterestTableViewCell *cell = (InterestTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSString *category= (NSString *)[self.itemsInTable objectAtIndex:indexPath.row];
NSMutableArray *subcat =[[NSMutableArray alloc] init];
NSArray *keys = [cat allKeys];
id aKey = [keys objectAtIndex:indexPath.row];
subcat = [cat objectForKey:aKey];
cell.btnGroupTap.tag = indexPath.row+10000;
NSArray *count=(NSArray *)subcat;
int xoffset;
int yoffset = 0;
for(int i=0; i<count.count;i++)
{
if(i==0)
{
xoffset=0;
}
else
{
if(i%2 == 0)
{
xoffset = 0;
}
else
{
xoffset = 150;
}
}
if(i==0)
{
yoffset = 0;
}
else
{
if(i%2==0)
{
yoffset = yoffset+45;
}
}
NSString *sel = subcat[i][@"selected"];
NSString *key =subcat[i][@"key"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image;
if(![sel boolValue])
{
image = [UIImage imageNamed: @"unchecked.png"];
}
else
{
image = [UIImage imageNamed: @"checked.png"];
}
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(29,18,20,20)];
[imageView setImage:image];
UILabel *lbl1 = [[UILabel alloc] init];
[lbl1 setFrame:CGRectMake(0,5,100,20)];
lbl1.backgroundColor=[UIColor clearColor];
lbl1.textColor=[UIColor blackColor];
lbl1.frame = CGRectMake(40,0,100,40);
lbl1.numberOfLines =0;
[lbl1 setFont:[UIFont fontWithName:@"Roboto-Light" size:12]];
lbl1.text= subcat[i][@"value"];
button.tag= [key integerValue];
[button setTitle:@"" forState:UIControlStateNormal];
button.imageView.contentMode = UIViewContentModeScaleAspectFit;
[button setBackgroundImage:image forState:normal];
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
button.frame = CGRectMake(xoffset,20+yoffset,(screenWidth/2)-40,40);
[button addTarget:self action:@selector(CheckAction:) forControlEvents:UIControlEventTouchUpInside];
[button addSubview:lbl1];
[cell.ContainerView addSubview:button];
[cell.ContainerView bringSubviewToFront:button];
}
cell.ContainerView.hidden=YES;
cell.lblCategory.text = category;
return cell;
}
注意：我在[tableView beginUpdates];[tableView endUpdates];中使用了didSelectRowAtIndexPath。
答案 0 :(得分：2)
问题是您正在使用可重复使用的单元格。可以把它想象成市场上的购物车。你永远不会知道它是否是新的，也许你会得到一个已经在其中的产品。您应该始终在cellForRowAtIndexPath中清理您的单元格，然后继续执行您的代码。
<强> #edit 好像清理容器View应该有所帮助。像：
InterestTableViewCell *cell = (InterestTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
[[cell.ContainerView subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)];
答案 1 :(得分：0)
当您通过reusable cells使用dequeueReusableCellWithIdentifier时：因此，如果重复使用该单元格，那么它将具有之前添加的CategoryView（基本上为subviews）。你需要先删除它们而不是新的它们，你需要将其作为
for (UIView *subview in cell.ContainerView.subViews) {
if ([subview isKindOfClass:[UIButton class]]) {
[((UIButton *) subview) removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
[subview removeFromSuperview];
}
}
在cellForRowAtIndexPath：method as -
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
InterestTableViewCell *cell = (InterestTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
for (UIView *subview in cell.ContainerView.subViews) {
if ([subview isKindOfClass:[UIButton class]]) {
[((UIButton *) subview) removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
[subview removeFromSuperview];
}
}
NSString *category= (NSString *)[self.itemsInTable objectAtIndex:indexPath.row];
NSMutableArray *subcat =[[NSMutableArray alloc] init];
NSArray *keys = [cat allKeys];
id aKey = [keys objectAtIndex:indexPath.row];
subcat = [cat objectForKey:aKey];
cell.btnGroupTap.tag = indexPath.row+10000;
NSArray *count=(NSArray *)subcat;
int xoffset;
int yoffset = 0;
for(int i=0; i<count.count;i++)
{
if(i==0)
{
xoffset=0;
}
else
{
if(i%2 == 0)
{
xoffset = 0;
}
else
{
xoffset = 150;
}
}
if(i==0)
{
yoffset = 0;
}
else
{
if(i%2==0)
{
yoffset = yoffset+45;
}
}
NSString *sel = subcat[i][@"selected"];
NSString *key =subcat[i][@"key"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image;
if(![sel boolValue])
{
image = [UIImage imageNamed: @"unchecked.png"];
}
else
{
image = [UIImage imageNamed: @"checked.png"];
}
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(29,18,20,20)];
[imageView setImage:image];
UILabel *lbl1 = [[UILabel alloc] init];
[lbl1 setFrame:CGRectMake(0,5,100,20)];
lbl1.backgroundColor=[UIColor clearColor];
lbl1.textColor=[UIColor blackColor];
lbl1.frame = CGRectMake(40,0,100,40);
lbl1.numberOfLines =0;
[lbl1 setFont:[UIFont fontWithName:@"Roboto-Light" size:12]];
lbl1.text= subcat[i][@"value"];
button.tag= [key integerValue];
[button setTitle:@"" forState:UIControlStateNormal];
button.imageView.contentMode = UIViewContentModeScaleAspectFit;
[button setBackgroundImage:image forState:normal];
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
button.frame = CGRectMake(xoffset,20+yoffset,(screenWidth/2)-40,40);
[button addTarget:self action:@selector(CheckAction:) forControlEvents:UIControlEventTouchUpInside];
[button addSubview:lbl1];
[cell.ContainerView addSubview:button];
[cell.ContainerView bringSubviewToFront:button];
}
cell.ContainerView.hidden=YES;
cell.lblCategory.text = category;
return cell;
}
注意：此外，如果您使用手动内存管理方案进行内存管理，则需要正确平衡对象的保留计数，例如在创建任何subview并添加后在那里发出release消息。如果不再需要，最后将其从superview中删除。我已在您的removeFromSuperView：方法中添加了这些release / cellForRowAtIndexPath条款。
但是，当您使用ARC时，系统将管理对象的保留/释放调用以管理内存