tableView的自适应高度

我们先是创建了一个plist文件用来保存本地的数据

自定义Model里的属性

//定义属性头像图片、名字、内容、图片、高度

@property (nonatomic,strong)NSString *headerImg,*name,*text,*img;

@property (nonatomic,assign)float height;

重写tableView

·//定义属性头像视图、名字标签、内容标签、图片视图

@property (nonatomic,strong)UIImageView *headerImg,*img;

@property (nonatomic,strong)UILabel *nameLab,*textLab;

。m

//初始化头像视图

- (UIImageView *)headerImg

{

if (!_headerImg) {

_headerImg = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 60, 60)];

_headerImg.layer.cornerRadius = 30;

_headerImg.layer.masksToBounds = YES;

[self addSubview:_headerImg];

}

return _headerImg;

}

//初始化名字标签

- (UILabel *)nameLab

{

if (!_nameLab) {

_nameLab = [[UILabel alloc]initWithFrame:CGRectMake(80, 20, 200, 40)];

[self addSubview:_nameLab];

}

return _nameLab;

}

//初始化内容标签

- (UILabel *)textLab

{

if (!_textLab) {

_textLab = [[UILabel alloc]init];

_textLab.numberOfLines = 0;

_textLab.font = [UIFont systemFontOfSize:15];

[self addSubview:_textLab];

}

return _textLab;

}

//初始化图片视图

- (UIImageView *)img

{

if (!_img) {

_img = [[UIImageView alloc]init];

[self addSubview:_img];

}

return _img;

}

ViewController的实现方法

#import "MyTableViewCell.h"

#import "Model.h"

{

//定义数组、表格

NSMutableArray *arr;

UITableView *table;

}

//获取plist初始化数组

NSString *path = [[NSBundle mainBundle]pathForResource:@"user" ofType:@"plist"];

NSArray *dataArr = [NSArray arrayWithContentsOfFile:path];

//变量数组初始化Model对象

arr = [NSMutableArray array];

for (NSDictionary *dic in dataArr) {

Model *m = [[Model alloc]init];

m.headerImg = dic[@"headerImg"];

m.name = dic[@"name"];

m.text = dic[@"text"];

m.img = dic[@"img"];

//根据文字计算标签高度

float height = [dic[@"text"] boundingRectWithSize:CGSizeMake(400, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:15],NSFontAttributeName, nil] context:nil].size.height;

m.height = height;

[arr addObject:m];

}

//初始化表格

table = [[UITableView alloc]initWithFrame:self.view.bounds];

table.dataSource = self;

table.delegate = self;

[self.view addSubview:table];

//创建头部图片视图

UIImageView *img = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 200)];

img.image = [UIImage imageNamed:@"headerImage1.jpg"];

table.tableHeaderView = img;

//设置行数

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return arr.count;

}

//设置单元格内容

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *cellid = @"cellid";

MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellid];

if (!cell) {

cell = [[MyTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellid];

}

//获取字典

Model *m = arr[indexPath.row];

//设置头像

cell.headerImg.image = [UIImage imageNamed:m.headerImg];

//设置名字

cell.nameLab.text = m.name;

//设置内容

cell.textLab.text = m.text;

cell.textLab.frame = CGRectMake(10, 80, 400, m.height);

//设置图片

cell.img.image = [UIImage imageNamed:m.img];

cell.img.frame = CGRectMake(100, m.height + 90, 200, 200);

return cell;

}

//设置单元格高度

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

Model *m = arr[indexPath.row];

//根据有无图片设置单元格高度

if ([m.img isEqualToString:@""]) {

return m.height + 90;

}else{

return m.height + 300;

}

}

//表格下拉响应方法

- (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 = 200 + ABS(yOffset);

CGFloat f = totalOffset / 200;

//拉伸后的图片的frame应该是同比例缩放。

table.tableHeaderView.frame =  CGRectMake(- (width *f-width) / 2, yOffset, width * f, totalOffset);

}

}