【发布时间】：2014-11-18 06:29:14
【问题描述】：
我可以使用 tableview 在每一行中显示多个图像并且可以滚动。这次我在 tableview 中使用 cutomcell。所以当上下滚动有点粘的时候，它需要流动而不粘不切。 IOS7 完美运行，但 IOS8 出现问题，所以任何人都建议我以更好的方式进行此滚动。
我的 cellForRowAtIndexPath 代码如下：
CellHomeFeedViewController *cell = (CellHomeFeedViewController*)[tableView dequeueReusableCellWithIdentifier:@"MyCell"];
if (cell==nil) {
cell = [[[CellHomeFeedViewController alloc] init] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.backgroundColor = [UIColor clearColor];
cell.lblUsername.textColor=[UIColor colorWithRed:0.0/255.0 green:176.0/255.0 blue:240.0/255.0 alpha:1.0];
cell.lblTime.textColor=[UIColor colorWithRed:71.0/255.0 green:72.0/255.0 blue:72.0/255.0 alpha:1.0];
cell.lblDetails.textColor=[UIColor colorWithRed:71.0/255.0 green:72.0/255.0 blue:72.0/255.0 alpha:1.0];
// Tap GestureRecognizer for User Image
UITapGestureRecognizer *UserImg = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(UserNameORimageGesture:)];
UserImg.delegate = self;
UserImg.numberOfTapsRequired = 1;
cell.imgUserPic.userInteractionEnabled = YES;
[cell.imgUserPic addGestureRecognizer:UserImg];
// Tap GestureRecognizer for Name Label
UITapGestureRecognizer *NameLabel = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(UserNameORimageGesture:)];
NameLabel.delegate = self;
NameLabel.numberOfTapsRequired = 1;
cell.lblUsername.userInteractionEnabled = YES;
[cell.lblUsername addGestureRecognizer:NameLabel];
// Tap GestureRecognizer for Time Label
UITapGestureRecognizer *TimeLabel = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(UserNameORimageGesture:)];
TimeLabel.delegate = self;
TimeLabel.numberOfTapsRequired = 1;
cell.lblTime.userInteractionEnabled = YES;
[cell.lblTime addGestureRecognizer:TimeLabel];
UITapGestureRecognizer *lbltotalCmt = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(lbltotalCmtPress:)];
lbltotalCmt.delegate = self;
lbltotalCmt.numberOfTapsRequired = 1;
cell.lblTotalComment.userInteractionEnabled = YES;
[cell.lblTotalComment addGestureRecognizer:lbltotalCmt];
cell.lblTotalComment.tag=indexPath.row;
UITapGestureRecognizer *lbltotalFav = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(lbltotalFavPress:)];
lbltotalFav.delegate = self;
lbltotalFav.numberOfTapsRequired = 1;
cell.lblTotalFavourite.userInteractionEnabled = YES;
[cell.lblTotalFavourite addGestureRecognizer:lbltotalFav];
cell.lblTotalFavourite.tag=indexPath.row;
cell.imgUserPic.tag=indexPath.row;
cell.lblUsername.tag=indexPath.row;
cell.lblTime.tag=indexPath.row;
cell.BtnCmnt.tag=indexPath.row;
cell.BtnGraph.tag=indexPath.row;
cell.BtnStar.tag=indexPath.row;
cell.btnMore.tag=indexPath.row;
cell.BtnFollow.tag = indexPath.row;
[cell.BtnFollow addTarget:self action:@selector(btnFollowListPress:) forControlEvents:UIControlEventTouchUpInside];
[cell.BtnCmnt addTarget:self action:@selector(BtnCmnt:) forControlEvents:UIControlEventTouchUpInside];
[cell.BtnGraph addTarget:self action:@selector(BtnGraph:) forControlEvents:UIControlEventTouchUpInside];
[cell.BtnStar addTarget:self action:@selector(BtnStar:) forControlEvents:UIControlEventTouchUpInside];
[cell.btnMore addTarget:self action:@selector(BtnMore:) forControlEvents:UIControlEventTouchUpInside];
}
NSData *newdata = [[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"album_title"] dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSString *mystring=[[NSString alloc] initWithData:newdata encoding:NSNonLossyASCIIStringEncoding];
if (mystring.length > 200) {
NSRange range = NSMakeRange(0, 200);
mystring = [mystring substringWithRange:range];
}
if (mystring.length > 0) {
cell.lblDetails.text = mystring;
}
cell.lblDetails.delegate = self;
cell.lblTotalFavourite.text = [NSString stringWithFormat:@"(%@)",[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"favourite_count"]];
cell.lblTotalComment.text = [NSString stringWithFormat:@"(%@)",[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"comments_count"]];
cell.lblTime.text = [[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"album_created"];
cell.lblUsername.text = [[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"user_name"];
[cell.imgUserPic sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",mainImageURL,[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"thum_image"]]] placeholderImage:[UIImage imageNamed:@"400_loading_img.png"]];
if ([[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"favourite_status"] isEqualToString:@"0"]) {
[cell.BtnStar setImage:[UIImage imageNamed:@"home_fvrte_icon.png"] forState:UIControlStateNormal];
} else {
[cell.BtnStar setImage:[UIImage imageNamed:@"home_fvrte_icon_on.png"] forState:UIControlStateNormal];
}
if ([[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"contact_allowed"] isEqualToString:@"1"]) {
if ([[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"is_following"] isEqualToString:@"1"]) {
cell.boolCheck = NO;
cell.BtnFollow.hidden = YES;
[cell.BtnFollow setImage:[UIImage imageNamed:@"following_icon.png"] forState:UIControlStateNormal];
} else {
cell.boolCheck = YES;
cell.BtnFollow.hidden = NO;
[cell.BtnFollow setImage:[UIImage imageNamed:@"hp_add_frnd_icon.png"] forState:UIControlStateNormal];
}
} else {
cell.boolCheck = NO;
cell.BtnFollow.hidden = YES;
}
if ([[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"has_commented"] isEqualToString:@"1"]) {
[cell.BtnCmnt setImage:[UIImage imageNamed:@"home_comment_on.png"] forState:UIControlStateNormal];
} else {
[cell.BtnCmnt setImage:[UIImage imageNamed:@"home_comment.png"] forState:UIControlStateNormal];
}
if ([[[arrAllPost objectAtIndex:indexPath.row] objectForKey:@"album_photo"] count]>0) {
cell.boolPostType = YES;
cell.tblSlider.hidden = NO;
cell.tblSlider.tag = indexPath.row;
cell.tblSlider.delegate = self;
cell.tblSlider.dataSource = self;
[cell.tblSlider reloadData];
} else {
cell.boolPostType = NO;
cell.tblSlider.hidden = YES;
}
return cell;
下面的cutomcell代码：
> @implementation CellHomeFeedViewController @synthesize
> imgUserPic,tblSlider; @synthesize
> lblUsername,lblTime,lblDetails,lblTotalFavourite; @synthesize
> BtnCmnt,BtnGraph,BtnStar,btnMore,imgClock,ViewBottom,BtnFollow,btnReadMore;
> @synthesize lblTotalComment,boolCheck,boolPostType;
>
> - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
> self = [super initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:reuseIdentifier];
> if (self)
> {
> appdelegate = (UBUBBLAppDelegate*)[UIApplication sharedApplication].delegate;
>
> imgUserPic = [[UIImageView alloc] init];
> [self.contentView addSubview:imgUserPic];
>
> lblUsername=[[UILabel alloc]init];
> lblUsername.textColor=[UIColor colorWithRed:0.0/255.0 green:176.0/255.0 blue:240.0/255.0 alpha:1.0];
> lblUsername.font= [UIFont fontWithName:@"calibri" size:14.0f];
> [lblUsername setBackgroundColor:[UIColor clearColor]];
> lblUsername.textAlignment = NSTextAlignmentLeft;
> [self.contentView addSubview:lblUsername];
>
> lblTime=[[UILabel alloc]init];
> [lblTime setBackgroundColor:[UIColor clearColor]];
> lblTime.font= [UIFont fontWithName:@"calibri" size:10.0f];
> lblTime.textAlignment = NSTextAlignmentLeft;
> [self.contentView addSubview:lblTime];
>
> appdelegate.lblLinkColor = [UIColor colorWithRed:0.0/255.0 green:176.0/255.0 blue:240.0/255.0 alpha:1.0];
> appdelegate.lblTxtColor = [UIColor darkGrayColor];
>
> lblDetails=[[KILabel alloc]init];
> lblDetails.font= [UIFont fontWithName:@"calibri" size:14.0f];
> [lblDetails setBackgroundColor:[UIColor clearColor]];
> lblDetails.textAlignment = NSTextAlignmentLeft;
> lblDetails.numberOfLines = 50;
> lblDetails.textColor = [UIColor blackColor];
> lblDetails.userInteractionEnabled = YES;
> [self.contentView addSubview:lblDetails];
>
> tblSlider=[[UITableView alloc] init];
> tblSlider.showsHorizontalScrollIndicator = NO;
> tblSlider.showsVerticalScrollIndicator = NO;
> tblSlider.separatorStyle = UITableViewCellSeparatorStyleNone;
> tblSlider.transform = CGAffineTransformMakeRotation(-M_PI_2);
> [self.contentView addSubview:tblSlider];
>
> imgClock = [[UIImageView alloc] init];
> imgClock.image = [UIImage imageNamed:@"home_clock_icon.png"];
> [self.contentView addSubview:imgClock];
>
> ViewBottom = [[UIView alloc] init];
> ViewBottom.backgroundColor = [UIColor clearColor];
> [self.contentView addSubview:ViewBottom];
>
> btnMore = [UIButton buttonWithType:UIButtonTypeCustom];
> [btnMore setImage:[UIImage imageNamed:@"home_more_icon.png"] forState:UIControlStateNormal];
> [ViewBottom addSubview:btnMore];
>
> BtnCmnt = [UIButton buttonWithType:UIButtonTypeCustom];
> [BtnCmnt setImage:[UIImage imageNamed:@"home_comment.png"] forState:UIControlStateNormal];
> [ViewBottom addSubview:BtnCmnt];
>
> BtnStar = [UIButton buttonWithType:UIButtonTypeCustom];
> [BtnStar setImage:[UIImage imageNamed:@"home_fvrte_icon_on.png"] forState:UIControlStateNormal];
> [ViewBottom addSubview:BtnStar];
>
> BtnFollow = [UIButton buttonWithType:UIButtonTypeCustom];
> [BtnFollow setImage:[UIImage imageNamed:@"following_icon.png"] forState:UIControlStateNormal];
> [ViewBottom addSubview:BtnFollow];
>
> BtnGraph = [UIButton buttonWithType:UIButtonTypeCustom];
> [BtnGraph setImage:[UIImage imageNamed:@"home_status_icon.png"] forState:UIControlStateNormal];
> [ViewBottom addSubview:BtnGraph];
>
> lblTotalComment=[[UILabel alloc]init];
> lblTotalComment.font= [UIFont fontWithName:@"calibri" size:12.0f];
> [lblTotalComment setBackgroundColor:[UIColor clearColor]];
> [lblTotalComment setTextColor:[UIColor darkGrayColor]];
> [ViewBottom addSubview:lblTotalComment];
>
> lblTotalFavourite=[[UILabel alloc]init];
> lblTotalFavourite.font= [UIFont fontWithName:@"calibri" size:12.0f];
> [lblTotalFavourite setBackgroundColor:[UIColor clearColor]];
> [lblTotalFavourite setTextColor:[UIColor darkGrayColor]];
> [ViewBottom addSubview:lblTotalFavourite];
>
> }
> return self; }
>
> -(void)layoutSubviews {
> [super layoutSubviews];
>
> imgUserPic.frame = CGRectMake(5, 5, 36, 36);
> imgClock.frame = CGRectMake(47, 27, 11, 12);
> lblTime.frame = CGRectMake(61, 27, 260, 12);
>
> NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
> paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
> paragraphStyle.alignment = NSTextAlignmentLeft;
>
> CGSize labelSize;
>
> NSDictionary * attributes = @{NSFontAttributeName : self.lblUsername.font,
> NSParagraphStyleAttributeName : paragraphStyle};
> labelSize = [lblUsername.text boundingRectWithSize:(CGSize){250, 17000}
> options:NSStringDrawingUsesFontLeading |
> NSStringDrawingUsesLineFragmentOrigin
> attributes:attributes context:nil].size;
> [lblUsername setFrame:CGRectMake(47, 7, 250, 18)];
>
> CGFloat yOffset = 45.0;
> NSDictionary * attributes1 = @{NSFontAttributeName : self.lblDetails.font,
> NSParagraphStyleAttributeName : paragraphStyle};
> labelSize = [lblDetails.text boundingRectWithSize:(CGSize){305, 17000}
> options:NSStringDrawingUsesFontLeading |
> NSStringDrawingUsesLineFragmentOrigin
> attributes:attributes1 context:nil].size;
> [lblDetails setFrame:CGRectMake(15, yOffset, 305, labelSize.height+30)];
>
> //btnReadMore.frame = CGRectMake(240, yOffset+labelSize.height-5, 80, 20);
>
> if (boolPostType) {
> yOffset+=labelSize.height+20;
> tblSlider.frame = CGRectMake(0, yOffset+10, 320, 182);
> yOffset+=185;
> BtnGraph.hidden = NO;
> if (boolCheck) {
> BtnCmnt.frame = CGRectMake(1, 0, 40, 40);
> BtnGraph.frame = CGRectMake(75, 0, 50, 40);
> BtnStar.frame = CGRectMake(141, 0, 40, 40);
> lblTotalComment.frame = CGRectMake(35, 5, 40, 30);
> lblTotalFavourite.frame = CGRectMake(174, 5, 40, 30);
> btnMore.frame = CGRectMake(270, 0, 50, 40);
> BtnFollow.frame = CGRectMake(213, 0, 50, 40);
> } else {
> BtnCmnt.frame = CGRectMake(1, 0, 40, 40);
> BtnGraph.frame = CGRectMake(95, 0, 50, 40);
> BtnStar.frame = CGRectMake(186, 0, 40, 40);
> lblTotalComment.frame = CGRectMake(35, 5, 40, 30);
> lblTotalFavourite.frame = CGRectMake(219, 5, 40, 30);
> btnMore.frame = CGRectMake(270, 0, 50, 40);
> }
> } else {
> yOffset+=labelSize.height+10;
> BtnGraph.hidden = YES;
> if (boolCheck) {
> BtnCmnt.frame = CGRectMake(1, 0, 40, 40);
> BtnStar.frame = CGRectMake(97, 0, 40, 40);
> lblTotalComment.frame = CGRectMake(35, 5, 40, 30);
> lblTotalFavourite.frame = CGRectMake(130, 5, 40, 30);
> btnMore.frame = CGRectMake(270, 0, 50, 40);
> BtnFollow.frame = CGRectMake(195, 0, 50, 40);
> } else {
> BtnCmnt.frame = CGRectMake(1, 0, 40, 40);
> BtnStar.frame = CGRectMake(136, 3, 30, 30);
> lblTotalComment.frame = CGRectMake(35, 5, 40, 30);
> lblTotalFavourite.frame = CGRectMake(165, 10, 35, 15);
> btnMore.frame = CGRectMake(270, 0, 50, 40);
> }
> }
>
> ViewBottom.frame = CGRectMake(0, yOffset+15, 320, 40); }
>
> -(CGFloat)requiredHieghtForCellInTableView:(UITableView *)tableView {
> NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
> paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
> paragraphStyle.alignment = NSTextAlignmentJustified;
>
> CGSize labelSize;
>
> CGFloat yOffset = 45.0;
> NSDictionary * attributes = @{NSFontAttributeName : self.lblDetails.font,
> NSParagraphStyleAttributeName :paragraphStyle};
> labelSize = [lblDetails.text boundingRectWithSize:(CGSize){305, 17000}
> options:NSStringDrawingUsesFontLeading |
> NSStringDrawingUsesLineFragmentOrigin
> attributes:attributes context:nil].size;
>
> yOffset+=labelSize.height;
>
> if (boolPostType)
> yOffset+=205;
> else
> yOffset+=10;
>
> yOffset+=60;
>
> return yOffset; }
>
> @end
【问题讨论】：
-
TL，没读过（很多）。但是，我在单元格中看到了
NSData到NSString的转换。我不知道这个数据（字符串）到底有多大大，但它肯定会影响性能。也许只是你问题的一部分，但它会影响。为什么不将NSData转换一次，然后将字符串本身存储在您的数组中？
标签： uitableview ios8 smooth-scrolling