iOS tableview实现顶部拉伸效果
本文实例为大家分享了iOS tableview头部拉伸效果展示的具体代码,例如探探个人信息界面拉伸效果,下拉头像放大
代码:
// // PersonController.m // Spread // // Created by qiuxuewei on 16/3/21. // Copyright © 2016年 邱学伟. All rights reserved. // #import "PersonController.h" @interface PersonController ()<UITableViewDataSource, UITableViewDelegate, UIScrollViewDelegate>{ } //属性列表 /** 顶部图片视图 */ @property (nonatomic, strong) UIImageView *headerImageView; @property (nonatomic, strong) UIView *headerBackView; /** 个人信息界面 */ @property (nonatomic, strong) UITableView *tableView; @end @implementation PersonController #pragma mark - 懒加载 -(UIView *)headerBackView{ if (_headerBackView == nil) { _headerBackView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, 200)]; [_headerBackView setBackgroundColor:[UIColor lightGrayColor]]; } return _headerBackView; } -(UIImageView *)headerImageView{ if (_headerImageView == nil) { _headerImageView = [[UIImageView alloc] init]; [_headerImageView setImage:[UIImage imageNamed:@"邱_生活.JPG"]]; [_headerImageView setBackgroundColor:[UIColor greenColor]]; [_headerImageView setContentMode:UIViewContentModeScaleAspectFill]; [_headerImageView setClipsToBounds:YES]; } return _headerImageView; } -(UITableView *)tableView{ if (_tableView == nil) { _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight) style:UITableViewStyleGrouped]; [_tableView setDataSource:self]; [_tableView setDelegate:self]; } return _tableView; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. //添加子视图 [self addChildViews]; } #pragma mark - 类内方法 //添加子视图 -(void)addChildViews{ //添加表格 [self.view addSubview:self.tableView]; //添加头像图片 [self addHeaderImageView]; } //添加头像 -(void)addHeaderImageView{ [self.tableView setTableHeaderView:self.headerBackView]; [self.headerImageView setFrame:self.headerBackView.bounds]; [self.headerBackView addSubview:self.headerImageView]; } #pragma mark - UITableViewDataSource - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ return 4; } -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return 2; } -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ return 64; } -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ // 不加此句时,在二级栏目点击返回时,此行会由选中状态慢慢变成非选中状态。 // 加上此句,返回时直接就是非选中状态。 [tableView deselectRowAtIndexPath:indexPath animated:YES]; } //初始化cell -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ static NSString *ID = @"cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID]; if (!cell) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID]; } //初始化cell数据! [cell.textLabel setText:@"阿伟"]; [cell.detailTextLabel setText:@"2016-03-22"]; return cell; } //滚动tableview 完毕之后 -(void)scrollViewDidScroll:(UIScrollView *)scrollView{ //图片高度 CGFloat imageHeight = self.headerBackView.frame.size.height; //图片宽度 CGFloat imageWidth = kScreenWidth; //图片上下偏移量 CGFloat imageOffsetY = scrollView.contentOffset.y; NSLog(@"图片上下偏移量 imageOffsetY:%f ->",imageOffsetY); //上移 if (imageOffsetY < 0) { CGFloat totalOffset = imageHeight + ABS(imageOffsetY); CGFloat f = totalOffset / imageHeight; self.headerImageView.frame = CGRectMake(-(imageWidth * f - imageWidth) * 0.5, imageOffsetY, imageWidth * f, totalOffset); } // //下移 // if (imageOffsetY > 0) { // CGFloat totalOffset = imageHeight - ABS(imageOffsetY); // CGFloat f = totalOffset / imageHeight; // // [self.headerImageView setFrame:CGRectMake(-(imageWidth * f - imageWidth) * 0.5, imageOffsetY, imageWidth * f, totalOffset)]; // } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } /* #pragma mark - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller. } */ @end
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持海外IDC网。
【转自:美国服务器】