我想使用UITableviewCell重用，我有自定义UITableViewCell并使用ARC，我的UITableViewCell是不同的。我的代码是：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
PostCount *post=[listArr objectAtIndex:indexPath.row];
static NSString *CellIdentifier = @"TimeLineViewCell";
TimeLineViewCell *cell = (TimeLineViewCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell==nil){
cell = [[TimeLineViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellIdentifier11"];
}
cell.tag=indexPath.row+1000;
cell.lab_time.text=[ModelClass intervalSinceNow:post.when btime:0];
cell.delegate=self;
[cell setViewStyle:post];
post=nil;
return cell;
}
你知道我是否使用
cell = [[TimeLineViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]
而不是
cell = [[TimeLineViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellIdentifier11"];
我的手机总是在错误的位置。为什么我无法使用相同的reuseIdentifier。如果我使用不同的reuseIdentifier，如果我的单元格没有重用。
对于其他Viewcontroller视图，当单元格的高度相同并且我使用相同的reuseIdentifier时，一切正常。有人可以帮我解决这个问题吗？
修改：我的自定义单元代码：
#import "TimeLineViewCell.h"
@implementation TimeLineViewCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
imageView_t=[[UIImageView alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
imageView_t.hidden=YES;
imageIcon=[[UIImageView alloc]initWithFrame:CGRectMake(295, 5, 16, 16)];
self.lab_time = [[UILabel alloc] initWithFrame:CGRectMake(210, 5, 80, 20)];
self.lab_time.textColor=[UIColor grayColor];
self.lab_time.font=[UIFont systemFontOfSize:12];
self.lab_time.textAlignment=UITextAlignmentRight;
self.lab_time.backgroundColor=[UIColor clearColor];
whoscreenName = [[UILabel alloc] initWithFrame:CGRectMake(60, 5, 145, 20)];
whoscreenName.textColor=[UIColor blackColor];
whoscreenName.font=[UIFont systemFontOfSize:18];
whoscreenName.lineBreakMode = UILineBreakModeTailTruncation;
whoscreenName.numberOfLines = 0;
whoscreenName.backgroundColor=[UIColor clearColor];
myWhat = [[UITextView alloc] init];
myWhat.textColor=[UIColor blackColor];
myWhat.backgroundColor=[UIColor clearColor];
[myWhat setScrollEnabled:NO];
[myWhat setEditable:NO];
myWhat.dataDetectorTypes=UIDataDetectorTypeLink;
[myWhat setCanCancelContentTouches:NO];
self.myWhaticon=[[UIView alloc]init];
myImageView=[[UIImageView alloc]init];
myImageView.hidden=YES;
myIndicatorView=[[UIActivityIndicatorView alloc ]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
myIndicatorView.hidden=YES;
whoBgView=[[UIImageView alloc]init];
whoBgView.image = [[UIImage imageNamed:@"timeline_rt_border_t.png"] stretchableImageWithLeftCapWidth:130 topCapHeight:7];
whoWhat = [[UITextView alloc] init];
whoWhat.textColor=[UIColor blackColor];
whoWhat.backgroundColor=[UIColor clearColor];
[whoWhat setScrollEnabled:NO];
[whoWhat setEditable:NO];
whoWhat.dataDetectorTypes=UIDataDetectorTypeLink;//url
[whoWhat setCanCancelContentTouches:NO];
whoImageView=[[UIImageView alloc]init];
whoImageView.hidden=YES;
activityIndicatorView=[[UIActivityIndicatorView alloc ]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityIndicatorView.hidden=YES;
myWhat.font=[UIFont systemFontOfSize:15];
whoWhat.font=[UIFont systemFontOfSize:14];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
- (void)layoutSubviews
{
[super layoutSubviews];
[self addSubview:imageView_t];
[self addSubview:imageIcon];
[self addSubview: self.lab_time];
[self addSubview:whoscreenName];
[self addSubview:myWhat];
[self addSubview:self.myWhaticon];
[self addSubview:myImageView];
[self addSubview:myIndicatorView];
[self addSubview:whoBgView];
[whoBgView addSubview:whoWhat];
[whoBgView addSubview:whoImageView];
[whoBgView addSubview: activityIndicatorView];
whoImageView=nil;
whoWhat=nil;
}
-(void)my_imag_btnClick:(UIButton *)btn{
[self.delegate my_imag_btnClick:btn.tag];
}
-(void)who_imag_btnClick:(UIButton *)btn{
NSLog(@"who_imag_btnClick");
[self.delegate who_imag_btnClick:btn.tag];
}
- (void)dealloc
{
imageView_t.image=nil;
imageView_t=nil;
imageIcon.image=nil;
imageIcon=nil;
whoscreenName=nil;
self.lab_time=nil;
whoscreenName=nil;
myWhat=nil;
self.myWhaticon=nil;
myImageView.image=nil;
myImageView=nil;
whoBgView.image=nil;
whoBgView=nil;
whoImageView.image=nil;
whoImageView=nil;
}
-(void)setViewStyle:(PostCount *)post{
//时间
if (self.btime==1) {
self.lab_time.text=[ModelClass intervalSinceNow:post.when btime:1 ];
}else{
self.lab_time.text=[ModelClass intervalSinceNow:post.when btime:0];
}
imageView_t.hidden=NO;
// imageView_t.isRoundIcon=YES;
imageView_t.layer.cornerRadius = 5;
imageView_t.layer.masksToBounds = YES;
//给图层添加一个有色边框
imageView_t.layer.borderWidth = 0.8;
imageView_t.layer.borderColor = [[UIColor colorWithRed:230.0/255 green:230.0/255 blue:230.0/255 alpha:1.0] CGColor];
if(![GlobalVariable isBlankString:post.who.avatarbig])
{
[imageView_t setImageWithURL:[NSURL URLWithString:post.who.avatarbig]
placeholderImage:[UIImage imageNamed:@"default_user.png"]];
}
else{
imageView_t.image=[UIImage imageNamed:@"default_user.png"];
}
//icon
imageIcon.image=[UIImage imageNamed:[ModelClass returnimage_source:post.source]];
whoscreenName.text=post.who.screenName;
CGSize size_myWhat =[ModelClass heightForTextView:[UIFont systemFontOfSize:15] WithText:post.what weith:250];
myWhat.frame=CGRectMake(50, 25, 250, size_myWhat.height);
myWhat.text=[NSString stringWithFormat:@"%@",post.what];
self.myWhaticon.frame=myWhat.frame;
if(![GlobalVariable isBlankString:post.img_small])
{
CGSize size_myImageView=CGSizeMake(80, 80);
myImageView.frame=CGRectMake(50, 30+size_myWhat.height, size_myImageView.width, 80);
myImageView.hidden=NO;
myIndicatorView.center=myImageView.center;
myIndicatorView.hidden=NO;
[myIndicatorView startAnimating];
__block UIActivityIndicatorView *indicatorView=myIndicatorView;
__block UIImageView *myImage = myImageView;
[myImageView setImageWithURL:[NSURL URLWithString:post.img_small]
placeholderImage:nil
success:^(UIImage *image){
CGRect sFrame=myImage.frame;
//缩放
CGSize newSize=image.size;
if (newSize.height>80) {
newSize.height=80;
newSize.width=newSize.width*80.0/image.size.height;
}else{
if (newSize.width>80) {
newSize.height=newSize.height *80.0/image.size.width;
newSize.width=80;
}else{//2个都小于80
newSize.height=newSize.height;
newSize.width=newSize.width;
}
}
sFrame.size=newSize;
myImage.frame=sFrame;
indicatorView.hidden=YES;
[indicatorView stopAnimating];
[indicatorView removeFromSuperview];
}
failure:^(NSError *error){
indicatorView.hidden=YES;
[indicatorView stopAnimating];
[indicatorView removeFromSuperview];
}];
UIButton * myImageBtn=[[UIButton alloc]init];
myImageBtn.frame= CGRectMake(50, 30+size_myWhat.height, size_myImageView.width, 80);
[myImageBtn addTarget:self action:@selector(my_imag_btnClick:) forControlEvents:UIControlEventTouchUpInside];
myImageBtn.tag=self.tag-1000;
// myImageBtn.backgroundColor=[UIColor blueColor];
[self addSubview:myImageBtn ];
}
if ([post.sourceTweet.what length]>0) {
whoWhat.text=[NSString stringWithFormat:@"@%@: %@",post.sourceTweet.who.screenName,post.sourceTweet.what];
}
CGSize size_whoWhat =[ModelClass heightForTextView:[UIFont systemFontOfSize:14] WithText:whoWhat.text weith:250];
whoWhat.frame=CGRectMake(10, 10, 250, size_whoWhat.height);
if(![GlobalVariable isBlankString:post.sourceTweet.img_small])
{
CGSize size_whoImageView=CGSizeMake(80, 80);
whoImageView.frame=CGRectMake(30, 15+size_whoWhat.height, size_whoImageView.width, 80);
whoImageView.hidden=NO;
activityIndicatorView.center=whoImageView.center;
activityIndicatorView.hidden=NO;
[activityIndicatorView startAnimating];
__block UIActivityIndicatorView *indicatorView = activityIndicatorView;
__block UIImageView *whoImage = whoImageView;
[whoImageView setImageWithURL:[NSURL URLWithString:post.sourceTweet.img_small]
placeholderImage:nil
success:^(UIImage *image){
CGRect sFrame=whoImage.frame;
//缩放
CGSize newSize=image.size;
if (newSize.height>80) {
newSize.height=80;
newSize.width=newSize.width*80.0/image.size.height;
}else{
if (newSize.width>80) {
newSize.height=newSize.height *80.0/image.size.width;
newSize.width=80;
}else{//2个都小于80
newSize.height=newSize.height;
newSize.width=newSize.width;
}
}
sFrame.size=newSize;
whoImage.frame=sFrame;
indicatorView.hidden=YES;
[indicatorView stopAnimating];
[indicatorView removeFromSuperview];
}
failure:^(NSError *error){
indicatorView.hidden=YES;
[indicatorView stopAnimating];
[indicatorView removeFromSuperview];
}];
UIButton * whoImageBtn=[[UIButton alloc]init];
int myimageHeight=0;
if (myImageView.frame.size.height>0) {
myimageHeight=5+80;
}
whoImageBtn.frame=CGRectMake(30+42, 40+size_myWhat.height+size_whoWhat.height+myimageHeight, 80, 80);
whoImageBtn.backgroundColor=[UIColor clearColor];
[whoImageBtn addTarget:self action:@selector(who_imag_btnClick:) forControlEvents:UIControlEventTouchUpInside];
whoImageBtn.tag=self.tag-1000;
[self addSubview:whoImageBtn ];
}
if (size_whoWhat.height<20) {
whoBgView.hidden=YES;
}else{
int myimageHeight=0;
if (myImageView.frame.size.height>0) {
myimageHeight=5+80;
}
whoBgView.frame=CGRectMake(42, 25+size_myWhat.height+myimageHeight, 270, 20+size_whoWhat.height+whoImageView.frame.size.height);
}
}
@end
答案 0 :(得分：2)
要么不重复使用单元格，要么为每个单元格提供自定义标识符。
对于自定义标识符，请替换为：
static NSString *CellIdentifier = @"TimeLineViewCell";
TimeLineViewCell *cell = (TimeLineViewCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell==nil){
cell = [[TimeLineViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellIdentifier11"];
}
用这个：
TimeLineViewCell *cell = (TimeLineViewCell*)[tableView dequeueReusableCellWithIdentifier:[NSString stringWithFormat:@"%i", indexPath.row]];
if(cell==nil){
cell = [[TimeLineViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:[NSString stringWithFormat:@"%i", indexPath.row]];
}
否则，只是不要出列，每次都创建一个新单元格。
注意：基于单元格的indexPath.row的自定义标识符仅在用户没有进行表格编辑时才有效。如果他们将编辑表格，请不要重复使用单元格。
答案 1 :(得分：1)
在提到@Sean时实施- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath。
应该是这样的：
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [self calculateRowHeighForIndexPath:indexPath];
}
- (CGFloat)calculateRowHeighForIndexPath:(NSIndexPath *)indexPath
{
//return height of corresponding image here
}
答案 2 :(得分：1)
@Praveen提供的博客有正确的答案。您必须实现以下方法，如@Sean D.所述：
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
这是设置TableViewCells高度的正确方法。您必须根据单元格的内容确定行的高度。如您所知indexPath，您可以通过indexPath.row
确定每行的高度答案 3 :(得分：0)
我按照以下方式重复使用UITableViewCell标识符
- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell;
UILabel *label = nil;
cell = [tv dequeueReusableCellWithIdentifier:@"Cell"];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"Cell"] autorelease];
label = [[UILabel alloc] initWithFrame:CGRectZero];
[label setLineBreakMode:UILineBreakModeWordWrap];
[label setMinimumFontSize:FONT_SIZE];
[label setNumberOfLines:0];
[label setFont:[UIFont systemFontOfSize:FONT_SIZE]];
[label setTag:1];
[[label layer] setBorderWidth:2.0f];
[[cell contentView] addSubview:label];
}
NSString *text = [items objectAtIndex:[indexPath row]];
CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];
if (!label)
label = (UILabel*)[cell viewWithTag:1];
[label setText:text];
[label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 44.0f))];
return cell;
}
从this博客中提取的代码。它可能会帮助你！
答案 4 :(得分：0)
我认为错误就在这里：
cell.tag = indexPath.row + 1000;
当您重复使用单元格时，您将使用新值来标记它的标记。 最好用
检查单元格编号[tableView indexPathForCell：cell];
请注意，它将仅为可见单元格返回正确的indexPath。