tableview 下拉图片放大

来源：互联网发布：站长工具域名备案编辑：程序博客网时间：2024/05/18 02:20
#import "RootViewController.h"@interface RootViewController ()@end@implementation RootViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor lightGrayColor];    [self setAutomaticallyAdjustsScrollViewInsets:NO];    self.myTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] bounds] style:UITableViewStylePlain];    [self.view addSubview:self.myTableView];    [_myTableView release];    //设置tableview的contentView距离上边界200    //相对于0点,已经向下偏移了-200    self.myTableView.contentInset = UIEdgeInsetsMake(200.0+64, 0, 0, 0);    self.myTableView.delegate = self;    self.myTableView.dataSource = self;    //相对于0点,图片坐标应该是(0,-200)    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, -200.0, self.view.frame.size.width, 200)];    self.imageView.image = [UIImage imageNamed:@"hua.jpg"];    //设置imageView高度改变时宽度也跟着改变    self.imageView.contentMode = UIViewContentModeScaleAspectFill;    [self.myTableView addSubview:self.imageView];    [_imageView release];}//指定多少行-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return 10;}//创建一个cell-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    NSString *cellIdentifier = @"cell";  UITableViewCell *cell =  [tableView dequeueReusableCellWithIdentifier:cellIdentifier];    if (!cell) {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];    }    cell.textLabel.text = [NSString stringWithFormat:@"%ld",indexPath.row];    cell.selectionStyle =  UITableViewCellSelectionStyleNone;    return cell;}//设置行高-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return 80;}-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    //点击后自动取消选中置灰效果    [tableView deselectRowAtIndexPath:indexPath animated:YES];}-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    //刚开始y的偏移量初始值就是-264    NSLog(@"y1 === %f",scrollView.contentOffset.y);    CGFloat y = scrollView.contentOffset.y + 64;//加上导航栏高度,第一次是-200    NSLog(@"y2 === %f",y);    if (y < -200) {        CGRect frame = self.imageView.frame;        frame.origin.y = y;//imageView的frame是不断往上偏移        frame.size.height =  -y;//tablview向下偏移了多少,高度就增加多少        self.imageView.frame = frame;    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end
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