单元格的选中效果和辅助效果

来源：互联网发布：山东省软件协会编辑：程序博客网时间：2024/04/29 21:43

AppDelegate设置根视图控制器

RootViewController.h

@interface RootViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>@property(nonatomic, retain)NSArray *data;@property(nonatomic, retain)NSIndexPath *selectIndexPath;   //标记选中的单元格

RootViewController.m

- (void)viewDidLoad{    [super viewDidLoad];    //创建表视图    UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, 320, 460) style:UITableViewStylePlain];    tableView.dataSource = self;    tableView.delegate = self;        //将表视图添加到视图上显示    [self.view addSubview:tableView];    [tableView release];        _data = [[UIFont familyNames] retain];    }#pragma mark - UITableView dataSource//返回需要创建多少个单元格- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _data.count;}//创建cell的，调用的次数由单元格的个数决定- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    //使用static修饰避免了重复创建字符串    static NSString *iden = nil;        if (indexPath.row == 0)    {        iden = @"cell_head";    }    else if (indexPath.row == _data.count - 1)    {        iden = @"cell_last";    }    else    {        iden = @"cell_common";    }        //从闲置池中查找是否存在可以使用的单元格    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:iden];    //如果没有找到则创建    if (cell == nil && indexPath.row == 0)    {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden]  autorelease];        cell.textLabel.backgroundColor = [UIColor clearColor];        //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_head"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_head_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];        //设置选中后label显示的字体        cell.textLabel.highlightedTextColor = [UIColor redColor];    }    else if (cell==nil && indexPath.row == _data.count-1)    {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden]  autorelease];        cell.textLabel.backgroundColor = [UIColor clearColor];        //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_bottom"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_bottom_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];        //设置选中后label显示的字体        cell.textLabel.highlightedTextColor = [UIColor redColor];    }    else if(cell == nil)    {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:iden]  autorelease];        cell.textLabel.backgroundColor = [UIColor clearColor];        //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_common"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_common_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];        //设置选中后label显示的字体        cell.textLabel.highlightedTextColor = [UIColor redColor];    }        if (indexPath.row == self.selectIndexPath.row && self.selectIndexPath != nil)    {        cell.accessoryType = UITableViewCellAccessoryCheckmark;    }    else    {        cell.accessoryType = UITableViewCellAccessoryNone;    }    /*    //设置第一个单元格显示的图片    if (indexPath.row == 0) {        //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_head"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_head_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];    }else if (indexPath.row == _data.count - 1) {        //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_bottom"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_bottom_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];    }else {            //设置正常状态显示的图片        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_common"]];        cell.backgroundView = imageView;        [imageView release];        //设置选中后显示的额图片        UIImageView *selecteImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tableCell_common_tapped"]];        cell.selectedBackgroundView = selecteImg;        [selecteImg release];    } */    //给cell添加显示的数据    cell.textLabel.text = [_data objectAtIndex:indexPath.row];        return cell;}#pragma mark - UITableView delegate- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    //取消上一次选中的额单元格    if (self.selectIndexPath != nil)    {        UITableViewCell *lastCell = [tableView cellForRowAtIndexPath:self.selectIndexPath];        lastCell.accessoryType = UITableViewCellAccessoryNone;    }        //查找选中的cell，并且给它添加选中的标记    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];    cell.accessoryType = UITableViewCellAccessoryCheckmark;        //记录选中的单元格    self.selectIndexPath = indexPath;}

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