首页 > 代码库 > 第十一篇、UITableView headerview下拉放大
第十一篇、UITableView headerview下拉放大
核心代码:
-(void)createTableViewHeaderView{ _tableViewHeaderView = [[UIView alloc] initWithFrame:(CGRectMake(0, 0, ScreenWidth, _imageHeight))]; _headerBackView = [[UIImageView alloc] init]; // 背景图 _headerBackView.frame = CGRectMake(0, 0, ScreenWidth, _imageHeight); _headerBackView.image = [UIImage imageNamed:@"bj1@2x.jpg"]; [_tableViewHeaderView addSubview:_headerBackView]; _photoImageView = [[UIImageView alloc] initWithFrame:CGRectMake((ScreenWidth - 62)/2, 15 , 62 , 62 )]; [self.tableViewHeaderView addSubview:self.photoImageView]; _photoImageView.layer.cornerRadius = 31 ; _photoImageView.layer.masksToBounds = YES; _photoImageView.image = [UIImage imageNamed:@"2.jpg"]; _userNameLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, _photoImageView.frame.origin.y + _photoImageView.frame.size.height + 8 , ScreenWidth, 20 )]; _userNameLabel.font = [UIFont fontWithName:@"iconfont" size:16 ]; _userNameLabel.text = @"纳兰性德"; _userNameLabel.textAlignment = 1; _userNameLabel.font = [UIFont systemFontOfSize:16 ]; _userNameLabel.textColor = [UIColor whiteColor]; [_tableViewHeaderView addSubview:self.userNameLabel]; _introduceLabel = [[UILabel alloc] initWithFrame:CGRectMake((ScreenWidth - 229 )/2, _userNameLabel.frame.origin.y + _userNameLabel.frame.size.height + 10 , 229 , 16 )]; _introduceLabel.alpha = .7; _introduceLabel.text = @"人生若只如初见,何事秋风悲画扇"; _introduceLabel.textAlignment = 1; _introduceLabel.font = [UIFont systemFontOfSize:12 ]; _introduceLabel.textColor = _userNameLabel.textColor; [_tableViewHeaderView addSubview:self.introduceLabel]; self.tableView.tableHeaderView = _tableViewHeaderView; }
- (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGFloat width = self.view.frame.size.width; // 图片宽度 CGFloat yOffset = scrollView.contentOffset.y; // 偏移的y值 if (yOffset < 0) { CGFloat totalOffset = _imageHeight + ABS(yOffset); CGFloat f = totalOffset / _imageHeight; self.headerBackView.frame = CGRectMake(- (width * f - width) / 2, yOffset, width * f, totalOffset); //拉伸后的图片的frame应该是同比例缩放。 } }
第十一篇、UITableView headerview下拉放大
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