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：
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//// 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服务器之家。
原文链接：https://blog.csdn.net/qxuewei/article/details/50956252
