表格视图单元格在单击细胞时更改高度
我有一个带有3个自定义单元格的 TableView 。
当点击其中一个单元格并转到WebView时，表格视图单元格会因某种原因而改变高度。然后，当我从WebView返回到TableView时，我可以看到表格视图单元格更改高度。
我认为这与细胞的高度错误有关，但我不确定。以下是我尝试过的内容：
1
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[D self]]) {
return 490; // As of 11/13/14
} else { // 2 other custom cells
return tableView.rowHeight; // return the default height
}
}
2
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
ListTableViewCell *cellOne = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
CGFloat heightOne = [cellOne.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightOne + 2;
} else if ([model isKindOfClass:[D self]]) {
ListTableViewCellTwo *cellTwo = [tableView dequeueReusableCellWithIdentifier:@"2Cell"];
CGFloat heightTwo = [cellTwo.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightTwo + 400;
} else if ([model isKindOfClass:[YR self]]) {
ListTableViewCellThree *cellThree = [tableView dequeueReusableCellWithIdentifier:@"3Cell"];
CGFloat heightThree = [cellThree.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightThree + 2;
} else {
return 175;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
FR *fD = (FR *)model;
ListTableViewCell *1Cell = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
NSString *link = [NSString stringWithFormat:@"%@", fD.link];
1Cell.labelHeadline.text = title;
1Cell.labelDescription.text = description;
1Cell.labelPublished.text = dateString;
return 1Cell;
} else if ([model isKindOfClass:[YR self]]) {
YR *fD = (YR *)model;
ListTableViewCell *3Cell = [tableView dequeueReusableCellWithIdentifier:@"3Cell"];
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
NSString *link = [NSString stringWithFormat:@"%@", fD.link];
3Cell.labelHeadline.text = title;
3Cell.labelDescription.text = description;
3Cell.labelPublished.text = dateString;
return 3Cell;
} else {
D *dD = (D *)model;
ListTableViewCellTwo *2Cell = [tableView dequeueReusableCellWithIdentifier:@"2Cell"];
NSString *dateString = [self timeSincePublished:dD.created_time];
NSString *cap = [NSString stringWithFormat:@"%@", dD.cap.text];
NSString *us = [NSString stringWithFormat:@"%@", dD.us.use];
2Cell.labelHeadline.text = us;
2Cell.labelDescription.text = cap;
2Cell.labelPublished.text = dateString;
return 2Cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Remove grey background from Highlighted State
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
根据Matt Tang更新：
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
ListTableViewCell *1Cell = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
if (!1Cell) {
1Cell = [[ListTableViewCell alloc] init];
FR *fD = (FR *)model;
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
1Cell.labelHeadline.text = title;
1Cell.labelDescription.text = [description stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
1Cell.labelPublished.text = dateString;
}
CGFloat heightOne = [1Cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightOne + 2;
} else if ([model isKindOfClass:[YR self]]) {
ListTableViewCellThree *3Cell = [tableView dequeueReusableCellWithIdentifier:@"3Cell"];
if (!3Cell) {
3Cell = [[ListTableViewCellThree alloc] init];
YR *fD = (YR *)model;
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
3Cell.labelHeadline.text = title;
3Cell.labelDescription.text = description;
3Cell.labelPublished.text = dateString;
}
CGFloat heightThree = [3Cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightThree + 2;
} else if ([model isKindOfClass:[D self]]) {
ListTableViewCellTwo *2Cell = [tableView dequeueReusableCellWithIdentifier:@"2Cell"];
if (!2Cell) {
2Cell = [[ListTableViewCellTwo alloc] init];
D *dD = (D *)model;
NSString *dateStringI = [self timeSincePublished:dD.created_time];
NSString *TI = [NSString stringWithFormat:@"%@", dD.caption.text];
NSString *us = [NSString stringWithFormat:@"%@", dD.us.use];
2Cell.labelHeadline.text = us;
2Cell.labelDescription.text = cap;
2Cell.labelPublished.text = dateStringI;
}
CGFloat heightTwo = [2Cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightTwo + 450;
} else {
return 490;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
FR *fD = (FR *)model;
ListTableViewCell *1Cell = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
if (!1Cell) {
1Cell = [[ListTableViewCell alloc] init];
FR *fD = (FR *)model;
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
1Cell.labelHeadline.text = title;
1Cell.labelDescription.text = description;
1Cell.labelPublished.text = dateString;
}
return 1Cell;
}
// more code
FR *fD = (FR *)model;
ListTableViewCell *1Cell = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
NSString *link = [NSString stringWithFormat:@"%@", fD.link];
1Cell.labelHeadline.text = title;
1Cell.labelDescription.text = description;
1Cell.labelPublished.text = dateString;
return 1Cell;
}
CustomCell2.h（CustomCell2.m现在没有任何内容）：
@property (strong, nonatomic) IBOutlet UILabel *labelHeadline;
@property (strong, nonatomic) IBOutlet UILabel *labelPublished;
@property (strong, nonatomic) IBOutlet UILabel *labelDescription;
@property (strong, nonatomic) IBOutlet UIImageView *imageViewPic;
尝试设置断点。
1 个答案:
答案 0 :(得分：1)
你将不得不改变你实现tableView的方式：heightForRowAtIndexPath：
您调用dequeueReusableCellWithIdentifier：将您的自定义单元格对象返回以查找其高度。该方法仅跟踪屏幕上可见的单元格。当您离开该表视图时，它将自行清空。
您需要做的是检查dequeueReusableCellWithIdentifier后是否返回nil： * edit 你应该使用dequeueReusableCellWithIdentifier：forIndexPath：
如果它为零，则必须创建一个临时单元格，对其进行配置并返回其高度。
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
ListTableViewCell *cellOne = [tableView dequeueReusableCellWithIdentifier:@"1Cell" forIndexPath:indexPath];
if (!cellOne) {
cellOne = [[ListTableViewCell alloc] init];
FR *fD = (FR *)model;
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
NSString *link = [NSString stringWithFormat:@"%@", fD.link];
cellOne.labelHeadline.text = title;
cellOne.labelDescription.text = description;
cellOne.labelPublished.text = dateString;
}
// Make sure the cell's frame is updated
[cellOne setNeedsLayout];
[cellOne layoutIfNeeded];
CGFloat heightOne = [cellOne.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
return heightOne + 2;
} else if ([model isKindOfClass:[D self]]) {
// more code
}
如果您想遵循DRY原则，请创建一个名为
的方法- (ListTableViewCell *)configureCellForModel:(id)model;
并根据模型类中的所有自定义单元格配置代码。让它返回单元格并在tableView：cellForRowAtIndexPath：和tableView：heightForRowAtIndexPath：
中调用它更新示例
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id model = self.Model[indexPath.row];
if ([model isKindOfClass:[FR self]]) {
FR *fD = (FR *)model;
ListTableViewCell *1Cell = [tableView dequeueReusableCellWithIdentifier:@"1Cell"];
if (!1Cell) {
1Cell = [[ListTableViewCell alloc] init];
FR *fD = (FR *)model;
NSString *title = [NSString stringWithFormat:@"%@", fD.title];
NSString *dateString = [self timeSincePublished:fD.pubDate];
NSString *description = [self removeHTMLTags:fD.description];
1Cell.labelHeadline.text = title;
1Cell.labelDescription.text = description;
1Cell.labelPublished.text = dateString;
}
return 1Cell;
}
// more code
}
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