cell中互顶的效果实现 weico+
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
UITableView * tv = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 460) style:UITableViewStylePlain];
tv.delegate = self;
tv.dataSource = self;
[self.view addSubview:tv];
[tv release];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 10;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString * cellID = [NSString stringWithFormat:@"cell_%d",indexPath.row];
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if(!cell)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
[self makeCell:cell atIndexPath:indexPath];
[cell autorelease];
}
NSLog(@"tableView.contentOffset : %f",tableView.contentOffset.y);
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 150.0;
}
- (void)makeCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 80, 30)];
label.backgroundColor = [UIColor orangeColor];
label.text = [NSString stringWithFormat:@"%d",indexPath.row];
[cell addSubview:label];
[label release];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
//将scrollView转换为tableView
UITableView * tv = (UITableView *)scrollView;
NSIndexPath * indexPath = [tv indexPathForRowAtPoint:tv.contentOffset];
//拿到当前在视图最顶部的cell
UITableViewCell * tempCell = [tv cellForRowAtIndexPath:indexPath];
//拿到所有可视化的cell
NSArray * visibleCellArray = [tv visibleCells];
UITableViewCell * firstCell = [visibleCellArray objectAtIndex:0];
//如果这两个cell相等的话
if(tempCell == firstCell)
{
//将视图中所有的cell中的label.frame.origin都置为0
for(UITableViewCell * cell in visibleCellArray)
{
for(UIView * view in [cell subviews])
{
if(view.frame.size.height == 30)
{
view.frame = CGRectMake(0, 0, 80, 30);
}
}
}
}
//对当前视图最顶层的cell进行操作。
NSArray * array = [tempCell subviews];
NSInteger rowHeight;
if(indexPath.row == 0)
{
//第一行 之前的行高为0
rowHeight = 0;
}
else
{
// 之后的行 行高为之前行的总和
rowHeight = 150 * indexPath.row;
}
//如果视图偏移量小于0 将最顶层的cell中的label的起点复位
if(tv.contentOffset.y < 0)
{
NSArray * firstScreenCellArray = [tv visibleCells];
UITableViewCell * firstCell = [firstScreenCellArray objectAtIndex:0];
for(UIView * view in [firstCell subviews])
{
if(view.frame.size.height == 30)
{
view.frame = CGRectMake(0, 0, 80, 30);
}
}
}
for(UIView * view in array)
{
if(view.frame.size.height == 30)
{
view.frame = CGRectMake(0, tv.contentOffset.y - rowHeight, 80, 30);
if(tv.contentOffset.y + 30 > rowHeight + 150)
{
view.frame = CGRectMake(0, 120, 80, 30);
}
}
}
NSLog(@"%@",indexPath);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}