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, span) UIImageView *headerImageView;

@property (nonatomic, span) UIView *headerBackView;

/** 个人信息界面 */

@property (nonatomic, span) 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

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