Cell细解

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参考:http://blog.csdn.net/u011449777/article/details/25384405感谢该网友的帮助!


1、使用headerView注意事项:

使用前要先注册以便复用:

static NSString *headerFooterViewReuseIdentifier = @"HeaderFooterViewReuseIdentifier";[self.tableView registerClass:[HeadView class] forHeaderFooterViewReuseIdentifier:headerFooterViewReuseIdentifier];//注意虽然函数的返回值写的是View类型的,但是应该返回UITableViewHeaderFooterView *型- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {    //初始化imageView.UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 5, 30, 30)];    if (self.isDown) {        imageView.frame = CGRectMake(290, 5, 30, 30);    }imageView.image = [UIImage imageNamed:@"头像"];imageView.backgroundColor = [UIColor redColor];        //重用headerViewHeadView *headerView = [self.tableView dequeueReusableHeaderFooterViewWithIdentifier:headerFooterViewReuseIdentifier];        //把imageView赋值给HeaderView的属性。headerView.imageView = imageView;    return headerView;}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {// UITableView从UIScrollView继承了一个属性contentOffset,通过它,我们可以知道UITableView显示的左上角的偏移量。CGPoint point = scrollView.contentOffset    //根据contentOffset获得顶部indexPath。NSIndexPath *path = [self.tableView indexPathForRowAtPoint:point];    //通过UITableView在ios6新增的方法,我们就可以通过indexPath.section获得顶部的headerView。HeadView *headerView = (HeadView *)[self.tableView headerViewForSection:path.section];    UIImageView *imageView = headerView.imageView;    //根据滚动方向的不同,头像的移动方向也不同。所以,我们要添加一个属性,来帮助我们判断滚动方向。if ((point.y > self.lastPoint.y) && (imageView.frame.origin.x == 10)) {        self.isDown = NO;[UIView animateWithDuration:toRightDuration animations: ^{    imageView.frame = CGRectMake(290, 5, 30, 30);}];}else if ((point.y < self.lastPoint.y) && (imageView.frame.origin.x == 290)) {        self.isDown = YES;[UIView animateWithDuration:toLeftDuration animations: ^{    imageView.frame = CGRectMake(10, 5, 30, 30);}];}    //把当前的point赋给self.lastPointself.lastPoint = point;}
//contentOffset 内容相对于scrollview的坐标//contentInset 内容相对于scrollview各个边的距离//根据偏移量得到显示内容最右上角的坐标,然后根据坐标得到相应的indexpatchCGPoint point = scrollView.contentOffset;NSIndexPath *path = [self.tableView indexPathForRowAtPoint:point];

;

//去掉UItableview headerview黏性(sticky)- (void)scrollViewDidScroll:(UIScrollView *)scrollView {    CGFloat sectionHeaderHeight = 40;    if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {        scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);    } else if (scrollView.contentOffset.y>=sectionHeaderHeight) {        scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);    }} 

                                             
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