在UITableViewCell中使用UIImage的UIButton - 重叠等
我的UITableViewCell存在问题。我正在开发一个应用程序,其中某个Feed中的某些帖子可能包含一个图片,并且点击的按钮还需要包含一个“标签”号码,具体取决于表格的哪一行,因为我已下载一组图片。在UITableViewCell中使用UIImage的UIButton - 重叠等
问题在于当我滚动(如你已经猜到的)表格时。图像加载正常,但是当我向上/向下滚动时,图像将会在其他单元格上方移动,并且当单元格显示回屏幕上时,图像将快速将其位置改变到正确的位置等。
这里是我的UITableView的代码:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [feed count];
}
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier
{
CGRect rect = [self.tableView bounds];
CGRect CellFrame = CGRectMake(0.0f, 0.0f, rect.size.width, 10.0f);
CGRect TitleFrame = CGRectMake(55.0f, 10.0f, 240.0f, 15.0f);
CGRect TextFrame = CGRectMake(55.0f, 25.0f, 250.0f, 15.0f);
CGRect PinFrame = CGRectMake(21.0f, 10.0f, 30.0f, 30.0f);
CGRect ViewFrame = CGRectMake(50.0f, 35.0f, 260.0f, 0.0f);
CGRect CommentsFrame = CGRectMake(300.0f, 10.0f, 20.0f, 15.0f);
UILabel * lblTemp;
UITableViewCell * cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
[cell setFrame:CellFrame];
lblTemp = [[UILabel alloc] initWithFrame:TitleFrame];
lblTemp.tag = 1;
lblTemp.numberOfLines = 0;
lblTemp.opaque = NO;
lblTemp.font = [UIFont systemFontOfSize:13.0f];
lblTemp.backgroundColor = [UIColor clearColor];
lblTemp.textColor = [UIColor blackColor];
lblTemp.textAlignment = UITextAlignmentLeft;
lblTemp.shadowColor = [UIColor whiteColor];
lblTemp.shadowOffset = CGSizeMake(0, 1);
[cell.contentView addSubview:lblTemp];
lblTemp = [[UILabel alloc] initWithFrame:TextFrame];
lblTemp.tag = 2;
lblTemp.numberOfLines = 0;
lblTemp.lineBreakMode = UILineBreakModeWordWrap;
lblTemp.adjustsFontSizeToFitWidth = NO;
lblTemp.font = [UIFont systemFontOfSize:13.0f];
lblTemp.textColor = [UIColor lightGrayColor];
lblTemp.backgroundColor = [UIColor clearColor];
lblTemp.shadowColor = [UIColor whiteColor];
lblTemp.shadowOffset = CGSizeMake(0, 1);
[cell.contentView addSubview:lblTemp];
lblTemp = [[UILabel alloc] initWithFrame:CommentsFrame];
lblTemp.tag = 5;
lblTemp.numberOfLines = 1;
lblTemp.font = [UIFont systemFontOfSize:13.0f];
lblTemp.textColor = [UIColor lightGrayColor];
lblTemp.backgroundColor = [UIColor whiteColor];
lblTemp.shadowColor = [UIColor whiteColor];
lblTemp.shadowOffset = CGSizeMake(0, 1);
[cell.contentView addSubview:lblTemp];
UIImageView * imgTemp = [[UIImageView alloc] initWithFrame:PinFrame];
imgTemp.tag = 3;
[cell.contentView addSubview:imgTemp];
UIView * viewTemp = [[UIView alloc] initWithFrame:ViewFrame];
viewTemp.tag = 4;
[viewTemp setBackgroundColor:[UIColor whiteColor]];
[cell.contentView addSubview:viewTemp];
return cell;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * CellIdentifier = @"Cell";
UITableViewCell * cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//UITableViewCell * cell = [self getCellContentView:CellIdentifier];
if (cell == nil) {
cell = [self getCellContentView:CellIdentifier];
} else {
[cell.contentView viewWithTag:999];
}
cell.backgroundColor = [UIColor clearColor];
UILabel * title = (UILabel *)[cell viewWithTag:1];
UILabel * journey = (UILabel *)[cell viewWithTag:2];
UIImageView * pin = (UIImageView *) [cell viewWithTag:3];
UILabel * comments = (UILabel *)[cell viewWithTag:5];
title.text = [NSString stringWithFormat:@"%@", [[feed objectAtIndex:indexPath.row] objectForKey:@"comment"]];
[title sizeToFit];
title.frame = CGRectMake(title.frame.origin.x, title.frame.origin.y, 240, title.frame.size.height);
if ([[feed objectAtIndex:indexPath.row] objectForKey:@"weather_desc"] != [NSNull null] ||
[[feed objectAtIndex:indexPath.row] objectForKey:@"weather_temp"] != [NSNull null]) {
journey.text = [NSString stringWithFormat:@"It's %@ and %@°C.", [[feed objectAtIndex:indexPath.row] objectForKey:@"weather_desc"], [[feed objectAtIndex:indexPath.row] objectForKey:@"weather_temp"]];
} else {
journey.text = [NSString stringWithFormat:@"%@", [[[feed objectAtIndex:indexPath.row] objectForKey:@"journey"] objectForKey:@"name"]];
}
journey.frame = CGRectMake(journey.frame.origin.x, 10 + title.frame.size.height, 240, 15);
if ([[feed objectAtIndex:indexPath.row] objectForKey:@"latitude"] != [NSNull null]) {
pin.image = [UIImage imageNamed:@"LocationPin.png"];
} else {
pin.image = [UIImage imageNamed:@"Pin.png"];
}
if ([[feed objectAtIndex:indexPath.row] objectForKey:@"image_file_size"] != [NSNull null]) {
NSString * text = [NSString stringWithFormat:@"%@", [[feed objectAtIndex:indexPath.row] objectForKey:@"comment"]];
CGFloat height = [text sizeWithFont:[UIFont systemFontOfSize:13] constrainedToSize:CGSizeMake(250, 1500) lineBreakMode:UILineBreakModeWordWrap].height;
UIImage * myImage = [images objectForKey:[NSString stringWithFormat:@"%i", indexPath.row]];
UIButton * button = [[UIButton alloc] initWithFrame:CGRectZero];
[button setBackgroundImage:myImage forState:UIControlStateNormal];
[button setFrame:CGRectMake(title.frame.origin.x + 55.0f, 40.0f + height, 250.0f, myImage.size.height)];
[button setTag:10 + indexPath.row];
[button addTarget:self action:@selector(imagePressed:) forControlEvents:UIControlEventTouchUpInside];
[cell addSubview:button];
UIView * backView = (UIView *) [cell viewWithTag:4];
[backView setFrame:CGRectMake(title.frame.origin.x + 50.0f, 35.0f + height, 260.0f, myImage.size.height + 10.0f)];
} else {
UIView * backView = (UIView *) [cell viewWithTag:4];
[backView setFrame:CGRectZero];
[backView setBackgroundColor:[UIColor clearColor]];
}
comments.text = [NSString stringWithFormat:@"%i", [[[feed objectAtIndex:indexPath.row] objectForKey:@"comments"] count]];
UIImage * background = [UIImage imageNamed:@"CellBackground.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:background];
imageView.contentMode = UIViewContentModeScaleToFill;
[cell setBackgroundView:imageView];
return cell;
}
- (void)tableView:(UITableView *)tv didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableView deselectRowAtIndexPath:indexPath animated:NO];
MilestoneView * milestoneView = [[MilestoneView alloc] initWithNibName:@"MilestoneView" bundle:nil];
[milestoneView setMilestone:[feed objectAtIndex:indexPath.row]];
[self.navigationController pushViewController:milestoneView animated:YES];
}
- (CGFloat)tableView:(UITableView *)tv heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString * text = [NSString stringWithFormat:@"%@", [[feed objectAtIndex:indexPath.row] objectForKey:@"comment"]];
CGFloat height = [text sizeWithFont:[UIFont systemFontOfSize:13] constrainedToSize:CGSizeMake(240, 1500) lineBreakMode:UILineBreakModeWordWrap].height;
if ([[feed objectAtIndex:indexPath.row] objectForKey:@"image_file_size"] != [NSNull null]) {
UIImage * myImage = [images objectForKey:[NSString stringWithFormat:@"%i", indexPath.row]];
height += myImage.size.height + 15.0f;
}
return height + 37;
}
我也在iOS 5.0中使用Apple的内置'ARC'。
亲切的问候,
多米尼克
端固定起来通过执行以下操作简单的代码的解决方案:
NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[sender superview]superview]];
我用UIButton的发送者获取,这是内部的细胞。我还抽出了.tag的所有修改,并将它们保留在相同的编号。
在这段代码中你的cellForRowAtIndexPath添加按钮,因此这是发生....
所以,你添加代码按钮,backView在getCellContentView并获取图像来自getCellContentView中的数组。
UIImage *myImage = [images objectForKey:[NSString stringWithFormat:@"%i", indexPath.row]];
然后,
UIButton *button = [[UIButton alloc] initWithFrame:CGRectZero];
[button setBackgroundImage:myImage forState:UIControlStateNormal];
[button setFrame:CGRectMake(55.0f, 40.0f, 250.0f, myImage.size.height)];
变化高度,宽度&的x,y坐标或。你想要什么和 设置单元格索引到按钮。
[button setTag:indexPath.row];
[button addTarget:self action:@selector(imagePressed:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button];
让我知道如果你有任何问题....
替换下面的函数头
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier {
.
.
}
使用此功能
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier indexPathForButtonTag:(NSIndexPath*)indexPath {
.
.
}
在cellForRowAtIndex
替换以下行cell = [self getCellContentView:CellIdentifier];
随着
cell = [self getCellContentView:CellIdentifier indexPathForButtonTag:indexPath];
唯一的问题是按钮标签的改变取决于它所在的行。 – Domness 2012-01-18 23:47:50
你不需要每个按钮有不同的标签。您不应该在cellForRowAtIndexPath中的单元格中添加任何子视图,因为您不可避免地最终会在子视图顶部添加子视图。我注意到你也在这个方法中添加了一个图像视图作为单元格的背景 - 当你创建一个新的单元格时,你只应该这样做。
我会假设你没有为这个单元格布局使用xib文件,所以只需在contentView方法中添加按钮并给它一个已知标签。
在您的按钮的操作方法,你可以找出表的按钮是通过使用locationInView:
和indexPathForRowAtPoint:
方法哪一行:
CGPoint hit = [sender locationInView:self.tableView];
NSIndexPath *hitRow = [self.tableView indexPathForRowAtPoint:hit];
另外请注意,视图的.hidden
属性设置为YES可能将其框架设置为CGRectZero的更少的努力。
说实话,你应该只使用一个NIB并做好它。这是太多的代码来有效地管理和维护。 – 2012-01-17 23:34:12