Tableview无法使用静态数据平滑滚动 [英] Tableview not scrolling smooth with static data
本文介绍了Tableview无法使用静态数据平滑滚动的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用自定义cell和headerView以及静态图像和footerView，但是滚动不像应该滚动的那样平滑，它卡在中间，然后滚动........
标题
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
UIView *headerview = [[UIView alloc]init];
if (section == 2) {
headerview.frame = CGRectMake(0, 30, tableView.frame.size.width, 117);
Button = [[UIButton alloc]initWithFrame:CGRectMake(0, 18, headerview.frame.size.width, 100)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(5, 0, tableView.frame.size.width, 17)];
label.text = @"Siddharth and hiren Like this";
label.font = [UIFont systemFontOfSize:10];
label.textColor = [UIColor blackColor];
[headerview addSubview:label];
}
else
{
headerview.frame = CGRectMake(0, 0, tableView.frame.size.width, 100);
Button = [[UIButton alloc]initWithFrame:headerview.frame];
}
// sheap top left and top right
UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:headerview.bounds
byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight)
cornerRadii:CGSizeMake(7.0, 7.0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
headerview.frame = headerview.bounds;
maskLayer.path = maskPath.CGPath;
headerview.layer.mask = maskLayer;
// shape for button bottom
headerview.backgroundColor = [UIColor whiteColor];
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 0, headerview.frame.size.width, 1);
bottomBorder.backgroundColor = [UIColor colorWithRed:217/255.0f green:217/255.0f blue:217/255.0f alpha:1].CGColor;
bottomBorder.shadowColor = [[UIColor blackColor] CGColor];
bottomBorder.shadowOpacity = 0.9f;
bottomBorder.shadowRadius = 0.3f;
[headerview.layer addSublayer:bottomBorder];
headerview.layer.shouldRasterize = YES;
// Button Imageview
UIImageView *buttonimg = [[UIImageView alloc]initWithFrame:Button.bounds];
buttonimg.image = [UIImage imageNamed:[_SecImgArray objectAtIndex:section]];
buttonimg.layer.shouldRasterize = YES;
[Button addSubview:buttonimg];
// imageview overlay
UIView *overlay = [[UIView alloc]initWithFrame:Button.bounds];
overlay.alpha = 0.3;
overlay.backgroundColor = [UIColor blackColor];
overlay.layer.shouldRasterize = YES;
[buttonimg addSubview:overlay];
[Button addTarget:self action:@selector(Expand: and:) forControlEvents:UIControlEventTouchUpInside];
Button.tag = section;
if ([[AllNewsdic objectForKey:@"posts"] count] == 0) {
[Button setTitle:[[[DownloadData objectForKey:@"posts"]objectAtIndex:section]objectForKey:@"title"] forState:UIControlStateNormal];
}
else
{
[Button setTitle:[[[AllNewsdic objectForKey:@"posts"]objectAtIndex:section]objectForKey:@"title"] forState:UIControlStateNormal];
}
[Button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
Button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
Button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
Button.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
Button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
Button.titleLabel.numberOfLines = 0;
Button.titleLabel.font = [UIFont fontWithName:@"Avenir-Black" size:12];
Button.layer.shadowColor = [UIColor greenColor].CGColor;
Button.layer.shadowOpacity = 0.4;
Button.layer.shadowRadius = 1.0f;
Button.layer.cornerRadius = 7;
Button.layer.masksToBounds = YES;
Button.layer.shouldRasterize = YES;
[headerview addSubview:Button];
return headerview;}
脚
-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
UIView *fotter = [[UIView alloc]initWithFrame:CGRectMake(0, -10, tableView.frame.size.width, 30)];
fotter.backgroundColor = [UIColor whiteColor];
// corner redius
UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:fotter.bounds
byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight)
cornerRadii:CGSizeMake(7.0, 7.0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
fotter.frame = fotter.bounds;
maskLayer.path = maskPath.CGPath;
// maskLayer.backgroundColor = [UIColor colorWithRed:217/255.0f green:217/255.0f blue:217/255.0f alpha:1].CGColor;
fotter.layer.mask = maskLayer;
// Bottom layer
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 32, fotter.frame.size.width, 2);
bottomBorder.backgroundColor = [UIColor blackColor].CGColor;
[fotter.layer addSublayer:bottomBorder];
// top Layer
CALayer *topLayer = [CALayer layer];
topLayer.frame = CGRectMake(13, 0, fotter.frame.size.width - 26, 0.7);
topLayer.backgroundColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1].CGColor;
topLayer.shadowOpacity = 0.6f;
topLayer.shadowRadius = 0.5f;
[fotter.layer addSublayer:topLayer];
// Like bUtton
likebutton = [[UIButton alloc]initWithFrame:CGRectMake(0, -3, fotter.frame.size.width/2, fotter.frame.size.height + 3)];
likebutton.titleLabel.font = [UIFont systemFontOfSize:10];
likebutton.titleLabel.tintColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1];
[likebutton addTarget:self action:@selector(like:) forControlEvents:UIControlEventTouchUpInside];
[likebutton setTitle:@"1 likes" forState:UIControlStateNormal];
likebutton.tag = section;
like = [[UIImageView alloc]initWithFrame:CGRectMake(40 ,8, 15, 15)];
like.image = [UIImage imageNamed:@"SimpleLike.png"];
[likebutton addSubview:like];
[likebutton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[fotter addSubview:likebutton];
// Follow Button
NSLog(@"%f",fotter.frame.size.width/2 + 1);
follow = [[UIButton alloc]initWithFrame:CGRectMake(fotter.frame.size.width/2 , -3, fotter.frame.size.width/2, fotter.frame.size.height + 3)];
follow.titleLabel.font = [UIFont systemFontOfSize:10];
follow.titleLabel.tintColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1];
[follow setTitle:@"Follow" forState:UIControlStateNormal];
followimage = [[UIImageView alloc]initWithFrame:CGRectMake(35 ,8, 17, 17)];
followimage.image = [UIImage imageNamed:@"Follow.png"];
[follow addSubview:followimage];
[follow setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
follow.tag = section;
[follow addTarget:self action:@selector(Follow:) forControlEvents:UIControlEventTouchUpInside];
[fotter addSubview:follow];
return fotter;}
单元格
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
AllNewsTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"AllNews"];
cell.one.text = [one objectAtIndex:indexPath.section];
cell.two.text = [two objectAtIndex:indexPath.section];
cell.three.text = [three objectAtIndex:indexPath.section];
[cell.three sizeToFit];
return cell;}
如何设置表格视图滚动的平滑和有效 如何设置界面属性 tableview数据是静态的
解决方案
在函数 viewForHeaderInSection 和 viewForFooterInSection 内部使用可重用的 UITableViewCell 不要为每个函数调用创建新的UIView和按钮.
I am using custom cell and headerView with static images and footerView but not scrolling as smoothly as it should scroll, it is getting stuck in middle and then scrolls........
Header
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
UIView *headerview = [[UIView alloc]init];
if (section == 2) {
headerview.frame = CGRectMake(0, 30, tableView.frame.size.width, 117);
Button = [[UIButton alloc]initWithFrame:CGRectMake(0, 18, headerview.frame.size.width, 100)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(5, 0, tableView.frame.size.width, 17)];
label.text = @"Siddharth and hiren Like this";
label.font = [UIFont systemFontOfSize:10];
label.textColor = [UIColor blackColor];
[headerview addSubview:label];
}
else
{
headerview.frame = CGRectMake(0, 0, tableView.frame.size.width, 100);
Button = [[UIButton alloc]initWithFrame:headerview.frame];
}
// sheap top left and top right
UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:headerview.bounds
byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight)
cornerRadii:CGSizeMake(7.0, 7.0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
headerview.frame = headerview.bounds;
maskLayer.path = maskPath.CGPath;
headerview.layer.mask = maskLayer;
// shape for button bottom
headerview.backgroundColor = [UIColor whiteColor];
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 0, headerview.frame.size.width, 1);
bottomBorder.backgroundColor = [UIColor colorWithRed:217/255.0f green:217/255.0f blue:217/255.0f alpha:1].CGColor;
bottomBorder.shadowColor = [[UIColor blackColor] CGColor];
bottomBorder.shadowOpacity = 0.9f;
bottomBorder.shadowRadius = 0.3f;
[headerview.layer addSublayer:bottomBorder];
headerview.layer.shouldRasterize = YES;
// Button Imageview
UIImageView *buttonimg = [[UIImageView alloc]initWithFrame:Button.bounds];
buttonimg.image = [UIImage imageNamed:[_SecImgArray objectAtIndex:section]];
buttonimg.layer.shouldRasterize = YES;
[Button addSubview:buttonimg];
// imageview overlay
UIView *overlay = [[UIView alloc]initWithFrame:Button.bounds];
overlay.alpha = 0.3;
overlay.backgroundColor = [UIColor blackColor];
overlay.layer.shouldRasterize = YES;
[buttonimg addSubview:overlay];
[Button addTarget:self action:@selector(Expand: and:) forControlEvents:UIControlEventTouchUpInside];
Button.tag = section;
if ([[AllNewsdic objectForKey:@"posts"] count] == 0) {
[Button setTitle:[[[DownloadData objectForKey:@"posts"]objectAtIndex:section]objectForKey:@"title"] forState:UIControlStateNormal];
}
else
{
[Button setTitle:[[[AllNewsdic objectForKey:@"posts"]objectAtIndex:section]objectForKey:@"title"] forState:UIControlStateNormal];
}
[Button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
Button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
Button.contentVerticalAlignment = UIControlContentVerticalAlignmentBottom;
Button.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
Button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
Button.titleLabel.numberOfLines = 0;
Button.titleLabel.font = [UIFont fontWithName:@"Avenir-Black" size:12];
Button.layer.shadowColor = [UIColor greenColor].CGColor;
Button.layer.shadowOpacity = 0.4;
Button.layer.shadowRadius = 1.0f;
Button.layer.cornerRadius = 7;
Button.layer.masksToBounds = YES;
Button.layer.shouldRasterize = YES;
[headerview addSubview:Button];
return headerview;}
Footer
-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
UIView *fotter = [[UIView alloc]initWithFrame:CGRectMake(0, -10, tableView.frame.size.width, 30)];
fotter.backgroundColor = [UIColor whiteColor];
// corner redius
UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:fotter.bounds
byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight)
cornerRadii:CGSizeMake(7.0, 7.0)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
fotter.frame = fotter.bounds;
maskLayer.path = maskPath.CGPath;
// maskLayer.backgroundColor = [UIColor colorWithRed:217/255.0f green:217/255.0f blue:217/255.0f alpha:1].CGColor;
fotter.layer.mask = maskLayer;
// Bottom layer
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 32, fotter.frame.size.width, 2);
bottomBorder.backgroundColor = [UIColor blackColor].CGColor;
[fotter.layer addSublayer:bottomBorder];
// top Layer
CALayer *topLayer = [CALayer layer];
topLayer.frame = CGRectMake(13, 0, fotter.frame.size.width - 26, 0.7);
topLayer.backgroundColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1].CGColor;
topLayer.shadowOpacity = 0.6f;
topLayer.shadowRadius = 0.5f;
[fotter.layer addSublayer:topLayer];
// Like bUtton
likebutton = [[UIButton alloc]initWithFrame:CGRectMake(0, -3, fotter.frame.size.width/2, fotter.frame.size.height + 3)];
likebutton.titleLabel.font = [UIFont systemFontOfSize:10];
likebutton.titleLabel.tintColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1];
[likebutton addTarget:self action:@selector(like:) forControlEvents:UIControlEventTouchUpInside];
[likebutton setTitle:@"1 likes" forState:UIControlStateNormal];
likebutton.tag = section;
like = [[UIImageView alloc]initWithFrame:CGRectMake(40 ,8, 15, 15)];
like.image = [UIImage imageNamed:@"SimpleLike.png"];
[likebutton addSubview:like];
[likebutton setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[fotter addSubview:likebutton];
// Follow Button
NSLog(@"%f",fotter.frame.size.width/2 + 1);
follow = [[UIButton alloc]initWithFrame:CGRectMake(fotter.frame.size.width/2 , -3, fotter.frame.size.width/2, fotter.frame.size.height + 3)];
follow.titleLabel.font = [UIFont systemFontOfSize:10];
follow.titleLabel.tintColor = [UIColor colorWithRed:197/255.0f green:187/255.0f blue:188/255.0f alpha:1];
[follow setTitle:@"Follow" forState:UIControlStateNormal];
followimage = [[UIImageView alloc]initWithFrame:CGRectMake(35 ,8, 17, 17)];
followimage.image = [UIImage imageNamed:@"Follow.png"];
[follow addSubview:followimage];
[follow setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
follow.tag = section;
[follow addTarget:self action:@selector(Follow:) forControlEvents:UIControlEventTouchUpInside];
[fotter addSubview:follow];
return fotter;}
Cell
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
AllNewsTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"AllNews"];
cell.one.text = [one objectAtIndex:indexPath.section];
cell.two.text = [two objectAtIndex:indexPath.section];
cell.three.text = [three objectAtIndex:indexPath.section];
[cell.three sizeToFit];
return cell;}
how to set tableview scroll smooth and effective how to set interface properties tableview data is static
解决方案
Use reusable UITableViewCell inside function viewForHeaderInSection and inside viewForFooterInSection Do not create the new UIView and buttons for each function call.
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