UILabel在Cell中包含NSLocalizedString;取决于语言,从几个字符到一个段落。有时候UILabel的框架会这样做,并且有时不会绘制以适应字符串长度。我相信这是一个重用问题,但我对如何解决这个问题不知所措。从Nib加载的UITableViewCell中的UILabel大小调整
我在viewDidLoad
一系列从笔尖(项目要求)装载五种不同的UITableViewCell子类:
UINib *Cell1Nib = [UINib nibWithNibName:@"customCell1" bundle:nil];
[[self tableView] registerNib:Cell1Nib forCellReuseIdentifier:@"custCell1"];
UINib *Cell2Nib = [UINib nibWithNibName:@"customCell2" bundle:nil];
[[self tableView] registerNib:Cell2Nib forCellReuseIdentifier:@"custCell2"];
//etc.
我有个帮手开始习惯依赖于文本的UILabel的高度:
- (CGFloat)getTextHeight:(NSString *)locStr forLabelWidth:(CGFloat)w {
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, w, 110)];
label.numberOfLines=0;
label.lineBreakMode=NSLineBreakByCharWrapping;
label.text = locStr; // highly variable & already localized
label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
CGSize maxSize = CGSizeMake(w, CGFLOAT_MAX);
CGSize requiredSize = [label sizeThatFits:maxSize];
label = nil; // ARC paranoia
return requiredSize.height;
}
在heightForRowAtIndexPath
我打电话getTextHeight:forLabelWidth:
,用它来确定单元格高度并将结果存储到一个名为labelHeightforRow.
的NSMutableArray中。到目前为止,一切都很好。
我创建该表为这样:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = nil;
DLX_CellDescriptor *desc = [[DLX_CellDescriptor alloc] initWithRow:indexPath.row];
//DLX_CellDescriptor describes attributes for cell at index , essentially a list of strings
CGFloat helpTextHeight = [[labelHeightforRow objectAtIndex:indexPath.row] floatValue];
if ([desc.nibToUse caseInsensitiveCompare:@"custCell1"] == NSOrderedSame) {
DLX_CustCell1 *currCell = (DLX_CustCell1 *)[self.tableView dequeueReusableCellWithIdentifier:@"custCell1"];
CGPoint origin = currCell.theLabel.frame.origin;
CGFloat w = currCell.theLabel.frame.size.width;
currCell.theLabel.frame = CGRectMake(origin.x, origin.y, w, helpTextHeight);
currCell.theLabel.text = desc.localizedText;
currCell.theLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
currCell.tag = indexPath.row;
cell = currCell;
} else if ([desc.nibToUse caseInsensitiveCompare:@"custCell2"] == NSOrderedSame) {
DLX_CustCell2 *currCell = (DLX_CustCell2 *)[self.tableView dequeueReusableCellWithIdentifier:@"custCell2"];
CGPoint origin = currCell.theLabel.frame.origin;
CGFloat w = currCell.theLabel.frame.size.width;
currCell.theLabel.frame = CGRectMake(origin.x, origin.y, w, helpTextHeight);
currCell.theLabel.text = desc.localizedText;
currCell.theLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
currCell.tag = indexPath.row;
cell = currCell;
} // for about 26 rows of 5 different non-identical sytles
// simplified in this example
return cell;
}
这个问题是创建初始的TableView时,该的UILabel是笔尖指定的高度:截断超长文字和下面给出一个大的白色空间(来自正确的细胞高度调整)。当表格被重新绘制时,UILabel变成代码中指定的正确高度;显示整个字符串。然后,如果该单元格被重新创建;例如,在它从屏幕上滚动并且绘制了另一个单元格类型之后,长文本标签再次使用来自Nib的截断高度。
我试图把layoutSubviews
进入自定义的UITableViewCell(customCell1.m,例如)这样:
- (void)layoutSubviews {
NSInteger currCell = self.tag;
DLX_CellDescriptor *desc = [[DLX_CellDescriptor alloc] initWithRow:currCell];
CGPoint origin = theLabel.frame.origin;
CGSize size = theLabel.frame.size;
CGFloat textHeight = [self getTextHeight:desc.localizedText forLabelWidth:size.width];
theLabel.frame = CGRectMake(origin.x, origin.y, size.width, textHeight);
[super layoutSubviews];
}
但是,这具有不可改变确保用于从笔尖的高度的影响;即使经过检查,textheight
是正确的(并且对于某些语言来说,远大于笔尖的高度)。
我彻底简化了问题中提供的示例代码,以避免混淆问题。实际的单元具有UIControls,图像,背景,手风琴功能等。但是,我不熟悉关闭重用。你能否详细说明一下? – NSConfusedCoder
@NSConfusedCoder答案已更新。 – sunkehappy
建议的代码(如果以键入方式实现的话)会导致获得相同错误的不同方法。但是,它确实指出了我走向正确的道路。我相信修复重用问题是确保reuseIdentifier是唯一的,像'NSString * reuseIdentifier = [NSString stringWithFormat:@“CellReuseIdentifier%d”,indexPath.row];' – NSConfusedCoder