TableView卡在iPhone中的滚动，但在模拟器中效果不错

Question

我一直在iPhone中开发一个应用程序，我正在为表视图制作自定义单元格。 以下是cellForRowAtIndexPath的代码。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 


static NSString *CellIdentifier = @"Cell"; 

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
if (cell == nil) { 
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; 
} 

// Configure the cell... 

[cell setSelectionStyle:UITableViewCellSelectionStyleNone]; 


    NSDictionary *CurrentCommentRow = [comments objectAtIndex:indexPath.row]; 
    NSString *Comment = [[CurrentCommentRow objectForKey:@"Comment"] objectForKey:@"text"]; 
    NSString *FirstName = [[CurrentCommentRow objectForKey:@"F_Name"] objectForKey:@"text"]; 
    NSString *LastName = [[CurrentCommentRow objectForKey:@"L_Name"] objectForKey:@"text"]; 
    NSString *Date = [[CurrentCommentRow objectForKey:@"date"] objectForKey:@"text"]; 
    NSString *Time = [[CurrentCommentRow objectForKey:@"Time"] objectForKey:@"text"]; 
    NSString *UserImagePath = [[CurrentCommentRow objectForKey:@"UserImage"] objectForKey:@"text"]; 
    NSString *TotalComments = (NSString*)[[CurrentCommentRow objectForKey:@"TotalComment"] objectForKey:@"text"]; 
    NSString *imageRelativePath = [UserImagePath substringFromIndex:[UserImagePath rangeOfString:@"/" options:NSBackwardsSearch].location]; 


    UIView *CommentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 297, 140)]; 

    NSString* imageURL = [NSString stringWithFormat:@"http://primehangout.com/Images/IPhone%@",imageRelativePath]; 
    NSURL* url = [NSURL URLWithString:imageURL];   
    HJManagedImageV *managedImage = [[HJManagedImageV alloc] initWithFrame:CGRectMake(10, 18, 56, 56)]; 
    managedImage.url = url; 
    [self.objManager manage:managedImage]; 
    [CommentView addSubview:managedImage]; 

    UILabel *lblName = [[UILabel alloc] initWithFrame:CGRectMake(82, 18, 180, 11)]; 
    lblName.font = [UIFont boldSystemFontOfSize:12]; 
    lblName.textColor = [UIColor colorWithRed:(5.0/255.0) green:(102.0/255.0) blue:(202.0/255.0) alpha:255]; 
    lblName.text = [NSString stringWithFormat:@"%@:",FirstName];   
    [CommentView addSubview:lblName]; 
    [lblName release]; 

    UITextView *txtViewComment = [[UITextView alloc] initWithFrame:CGRectMake(73, 34, 180, 40)]; 
    txtViewComment.contentInset = UIEdgeInsetsMake(-10,0,0,0); 
    [txtViewComment setEditable:FALSE]; 
    txtViewComment.font = [UIFont fontWithName:@"Arial" size:11]; 
    txtViewComment.text = Comment; 
    txtViewComment.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    [CommentView addSubview:txtViewComment]; 
    [txtViewComment release]; 


    UILabel *lblDateTime = [[UILabel alloc] initWithFrame:CGRectMake(82, 79, 180, 20)]; 
    lblDateTime.font = [UIFont fontWithName:@"Arial" size:10]; 
    lblDateTime.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    lblDateTime.text = [NSString stringWithFormat:@"%@ %@",Date,Time];  
    [CommentView addSubview:lblDateTime]; 
    [lblDateTime release]; 

    UILabel *lblTotalComments = [[UILabel alloc] initWithFrame:CGRectMake(82, 95, 80, 20)]; 
    lblTotalComments.font = [UIFont fontWithName:@"Arial" size:11]; 
    lblTotalComments.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    lblTotalComments.text = [NSString stringWithFormat:@"%@ Comments",TotalComments];  
    [CommentView addSubview:lblTotalComments]; 
    [lblTotalComments release]; 



    if ([TotalComments integerValue]>0) 
    { 
     UIButton *btnViewAll = [UIButton buttonWithType:UIButtonTypeCustom]; 
     [btnViewAll setFrame:CGRectMake(140, 82, 70, 45)]; 
     [btnViewAll setImage:[UIImage imageNamed:@"view_all_button_bg.png"] forState:UIControlStateNormal]; 
     //[lblViewAll setTitle:@"view all" forState:UIControlStateNormal]; 
     [btnViewAll addTarget:self action:@selector(ViewAllBtnPressed:) forControlEvents:UIControlEventTouchUpInside]; 
     [btnViewAll setTag:(150 + indexPath.row)]; 
     [CommentView addSubview:btnViewAll];      
    } 
    else { 
     [lblTotalComments setFrame:CGRectMake(82, 95, 150, 20)]; 
    } 


    UIButton *btnAddComment = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [btnAddComment setFrame:CGRectMake(200, 82, 70, 45)]; 
    [btnAddComment setImage:[UIImage imageNamed:@"add_comment.png"] forState:UIControlStateNormal]; 
    [btnAddComment addTarget:self action:@selector(ViewAllBtnPressed:) forControlEvents:UIControlEventTouchUpInside]; 
    [btnAddComment setTag:(1050 + indexPath.row)]; 
    [CommentView addSubview:btnAddComment]; 

    [cell.contentView addSubview: CommentView]; 

return cell; 

}

代码工作以及在iPhone模拟器，但在真正的iPhone scrolloing的实现代码如下stucks。

据我知道，重用能解决这个问题，我已经尝试了下面的代码太：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 


static NSString *CellIdentifier = @"Cell"; 
[cell setSelectionStyle:UITableViewCellSelectionStyleNone]; 
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
if (cell == nil) { 
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; 


    // Configure the cell... 




    NSDictionary *CurrentCommentRow = [comments objectAtIndex:indexPath.row]; 
    NSString *Comment = [[CurrentCommentRow objectForKey:@"Comment"] objectForKey:@"text"]; 
    NSString *FirstName = [[CurrentCommentRow objectForKey:@"F_Name"] objectForKey:@"text"]; 
    NSString *LastName = [[CurrentCommentRow objectForKey:@"L_Name"] objectForKey:@"text"]; 
    NSString *Date = [[CurrentCommentRow objectForKey:@"date"] objectForKey:@"text"]; 
    NSString *Time = [[CurrentCommentRow objectForKey:@"Time"] objectForKey:@"text"]; 
    NSString *UserImagePath = [[CurrentCommentRow objectForKey:@"UserImage"] objectForKey:@"text"]; 
    NSString *TotalComments = (NSString*)[[CurrentCommentRow objectForKey:@"TotalComment"] objectForKey:@"text"]; 
    NSString *imageRelativePath = [UserImagePath substringFromIndex:[UserImagePath rangeOfString:@"/" options:NSBackwardsSearch].location]; 


    UIView *CommentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 297, 140)]; 

    NSString* imageURL = [NSString stringWithFormat:@"http://primehangout.com/Images/IPhone%@",imageRelativePath]; 
    NSURL* url = [NSURL URLWithString:imageURL];   
    HJManagedImageV *managedImage = [[HJManagedImageV alloc] initWithFrame:CGRectMake(10, 18, 56, 56)]; 
    managedImage.url = url; 
    [self.objManager manage:managedImage]; 
    [CommentView addSubview:managedImage]; 

    UILabel *lblName = [[UILabel alloc] initWithFrame:CGRectMake(82, 18, 180, 11)]; 
    lblName.font = [UIFont boldSystemFontOfSize:12]; 
    lblName.textColor = [UIColor colorWithRed:(5.0/255.0) green:(102.0/255.0) blue:(202.0/255.0) alpha:255]; 
    lblName.text = [NSString stringWithFormat:@"%@:",FirstName];   
    [CommentView addSubview:lblName]; 
    [lblName release]; 

    UITextView *txtViewComment = [[UITextView alloc] initWithFrame:CGRectMake(73, 34, 180, 40)]; 
    txtViewComment.contentInset = UIEdgeInsetsMake(-10,0,0,0); 
    [txtViewComment setEditable:FALSE]; 
    txtViewComment.font = [UIFont fontWithName:@"Arial" size:11]; 
    txtViewComment.text = Comment; 
    txtViewComment.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    [CommentView addSubview:txtViewComment]; 
    [txtViewComment release]; 


    UILabel *lblDateTime = [[UILabel alloc] initWithFrame:CGRectMake(82, 79, 180, 20)]; 
    lblDateTime.font = [UIFont fontWithName:@"Arial" size:10]; 
    lblDateTime.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    lblDateTime.text = [NSString stringWithFormat:@"%@ %@",Date,Time];  
    [CommentView addSubview:lblDateTime]; 
    [lblDateTime release]; 

    UILabel *lblTotalComments = [[UILabel alloc] initWithFrame:CGRectMake(82, 95, 80, 20)]; 
    lblTotalComments.font = [UIFont fontWithName:@"Arial" size:11]; 
    lblTotalComments.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    lblTotalComments.text = [NSString stringWithFormat:@"%@ Comments",TotalComments];  
    [CommentView addSubview:lblTotalComments]; 
    [lblTotalComments release]; 



    if ([TotalComments integerValue]>0) 
    { 
     UIButton *btnViewAll = [UIButton buttonWithType:UIButtonTypeCustom]; 
     [btnViewAll setFrame:CGRectMake(140, 82, 70, 45)]; 
     [btnViewAll setImage:[UIImage imageNamed:@"view_all_button_bg.png"] forState:UIControlStateNormal]; 
     //[lblViewAll setTitle:@"view all" forState:UIControlStateNormal]; 
     [btnViewAll addTarget:self action:@selector(ViewAllBtnPressed:) forControlEvents:UIControlEventTouchUpInside]; 
     [btnViewAll setTag:(150 + indexPath.row)]; 
     [CommentView addSubview:btnViewAll];      
    } 
    else { 
     [lblTotalComments setFrame:CGRectMake(82, 95, 150, 20)]; 
    } 


    UIButton *btnAddComment = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [btnAddComment setFrame:CGRectMake(200, 82, 70, 45)]; 
    [btnAddComment setImage:[UIImage imageNamed:@"add_comment.png"] forState:UIControlStateNormal]; 
    [btnAddComment addTarget:self action:@selector(ViewAllBtnPressed:) forControlEvents:UIControlEventTouchUpInside]; 
    [btnAddComment setTag:(1050 + indexPath.row)]; 
    [CommentView addSubview:btnAddComment]; 

    [cell.contentView addSubview: CommentView]; 

} 



return cell; 

}

使用上面的代码后，滚动变得光滑，问题得到了解决，但一个新的问题提出的是，重复的内容是随机显示的，所有数据都会被误导。第一个单元格显示3-4次，依此类推...

如果有什么不清楚的地方，请随时问问朋友。 :)

Answer 1

重用是要走的路，但你做错了。
当然，您必须在重用单元格后设置新值。

if (cell == nil) { 
    // create new cell 
    cell = ... 
    UILabel *lblTotalComments = [[UILabel alloc] initWithFrame:CGRectMake(82, 95, 80, 20)]; 
    lblTotalComments.tag = 192; 
    lblTotalComments.font = [UIFont fontWithName:@"Arial" size:11]; 
    lblTotalComments.textColor = [UIColor colorWithRed:(75.0/255.0) green:(75.0/255.0) blue:(75.0/255.0) alpha:255]; 
    [CommentView addSubview:lblTotalComments]; 
    [lblTotalComments release]; 

} 
// configure cell 
UILabel *lblTotalComments = (UILabel *)[cell viewWithTag:192]; 
lblTotalComments.text = [NSString stringWithFormat:@"%@ Comments",TotalComments];  

你应该明白如何实现这个。

Answer 2

您是否每次都从互联网获取图像？你为什么不把它存储在一个imagecollection中？