今天早上在CocoaChina上看到一个tableViewCell高度自适应的demo,用到了SDAutoLayout这个第三方库,觉得挺方便的.所以想给大家分享一下,上代码.
我只创建2个控件,一个UIImageView和一个UIlabel.

Model.h

#import <Foundation/Foundation.h>

@interface Model : NSObject
@property(nonatomic, copy)NSString *coverimg;//图片请求的url
@property(nonatomic, copy)NSString *content;//用户发表的内容
@property(nonatomic, copy)NSString *coverimg_wh;//真实图片的尺寸,如"640*857"
@end

自定义的tableViewCell

//TableView.h
#import <UIKit/UIKit.h>
#import "Model.h"
@interface TableViewCell : UITableViewCell
@property(nonatomic, strong)Model *model;
@end

//TableView.m
#import "TableViewCell.h"
#import "UIView+SDAutoLayout.h"
#import "UITableView+SDAutoTableViewCellHeight.h"
#import "UIImageView+WebCache.h"
@implementation TableViewCell

{
    UIImageView *_imageView;//图片
    UILabel *_label;//文字
}

-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        [self createView];
    }
    return self;
}

-(void)createView
{
    //初始化并添加这两个控件
    UIImageView *view0 = [UIImageView new];
    view0.backgroundColor = [UIColor whiteColor];
    _imageView = view0;
    
    UILabel *view1 = [UILabel new];
    view1.textColor = [UIColor lightGrayColor];
    view1.font = [UIFont systemFontOfSize:16];
    _label = view1;
    [self.contentView addSubview:view0];
    [self.contentView addSubview:view1];
    
    //这里自动布局需要用到参照方位的概念
    _imageView.sd_layout
    .leftSpaceToView(self.contentView, 10)//表示_imageView左边离contentView的距离是10.可以理解为_imageView的x坐标与self.contentView的x坐标的差值
    .rightSpaceToView(self.contentView, 10)//同上,_imageView右边离contentView最右边的距离
    .topSpaceToView(self.contentView, 10);//_imageView的最上面离contentView的距离
    
    _label.sd_layout
    .topSpaceToView(_imageView, 10)//_label上方里_imageView的距离是10
    .leftEqualToView(_imageView)//_label与_imageView的左边间距一样,也就是x坐标一样
    .rightEqualToView(_imageView)//_label与_imageView的右边间距也一样,也就是说_label与_imageView的Width相同
    .autoHeightRatio(0);//只要设置了_label的宽度后,加上这句话就可以通过_label的文字自适应高度了
}

-(void)setModel:(Model *)model
{

    CGFloat bottomMargin = 10;
    _label.text = model.content;
    
    if (![model.coverimg_wh isEqualToString:@""]) {
        NSArray *array = [model.coverimg_wh componentsSeparatedByString:@"*"];//通过"*"截取字符串,获得宽和高
        //将宽和高转换成NSInteger类型
        NSInteger width = [array[0] floatValue];
        NSInteger height = [array[1] floatValue];
        CGFloat scale = height / width;//得到高和快的比例
        _imageView.sd_layout.autoHeightRatio(scale);//_imageView的宽度已经确定了,通过这个比例得到_imageView的高度
        [_imageView sd_setImageWithURL:[NSURL URLWithString:model.coverimg]];
        bottomMargin = 10;
    }
    else
    {
        _imageView.sd_layout.autoHeightRatio(0);
    }
    
    //第一个参数是cell最下面的那个view,第二个参数是最下面那个View离cell底部的距离
    [self setupAutoHeightWithBottomView:_label bottomMargin:bottomMargin];
}

- (void)awakeFromNib {
    // Initialization code
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

@end

其实这个第三方用起来还是挺简单的,我的注释应该还是比较详细吧

XMHNetWorking

这个是我通过AFNetWorking封装的网络请求方法

#import "XMHNetWorkingMethod.h"
#import "AFNetworking.h"
@implementation XMHNetWorkingMethod
+(void)getDataString:(NSString *)string BodyString:(NSDictionary *)bodyDic WithDataBlock:(void (^)(id))dataBlock
{
    //字符串转码
    string = [string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:string]];
    //创建管理者对象
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    //设置允许请求的类别
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/plain",@"text/json",@"application/json",@"text/javascript",@"text/html", @"application/javascript", @"text/js",@"application/x-javascript", nil];
    //开始请求
    if (!bodyDic) {
        //如果BodyString为空就执行Get请求
        [manager GET:string parameters:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
            //请求成功执行的操作
            dataBlock(responseObject);
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            //请求失败执行的操作
        }];
    }
    else
    {
        //否则执行POST请求
        [manager POST:string parameters:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
            dataBlock(responseObject);
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            
        }];
    }
}
@end

ViewController

#import "ViewController.h"
#define POSTURLSTRING @"http://api2.pianke.me/timeline/list"//网络请求的地址
#import "UIImageView+WebCache.h"//用于下载图片并保存到沙盒
#import "MJRefresh.h"//刷新加载第三方
#import "XMHNetWorkingMethod.h"//自己写的网络请求
#import "TableViewCell.h"//自定义的tableViewCell
#import "UITableView+SDAutoTableViewCellHeight.h"//自适应高度
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property(nonatomic, strong)UITableView *tableView;
@property(nonatomic, strong)NSMutableArray *listArray;
@end
static NSInteger flag = 0;
@implementation ViewController

-(void)loadView
{
    [super loadView];
    self.listArray = [NSMutableArray array];
    [self getData];
    //初始化tableview
    _tableView = [[UITableView alloc]initWithFrame:self.view.frame];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    [self.view addSubview:_tableView];
    
    //MJRefresh刷新加载的方法
    [self.tableView.header beginRefreshing];
    _tableView.header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
       //当下拉刷新的时候删除数组,重新获取最新数据再添加到数组
        flag = 0;
        [_listArray removeAllObjects];
        [self getData];
    }];
    _tableView.footer = [MJRefreshAutoNormalFooter footerWithRefreshingBlock:^{
        //当加载的时候将flag这个参数加10,再解析数据,得到新的一组数据再放进数组里
        flag += 10;
        [self getData];
    }];
}

-(void)getData
{
    NSString *str = [NSString stringWithFormat:@"%ld",flag];
    
    [XMHNetWorkingMethod getDataString:POSTURLSTRING BodyString:[NSDictionary dictionaryWithObjectsAndKeys:str,@"start",@"10",@"limit",@"2",@"client", nil] WithDataBlock:^(id data) {
        //KVC赋值,_listArray里放的全是model类型对象
        
        NSDictionary *dataDic = [data objectForKey:@"data"];
        NSArray *array = [dataDic objectForKey:@"list"];
        for (NSDictionary *dic in array) {
            Model *model = [[Model alloc]init];
            [model setValuesForKeysWithDictionary:dic];
            [_listArray addObject:model];
        }
        [_tableView.header endRefreshing];
        [_tableView.footer endRefreshing];
        [_tableView reloadData];
    }];
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    //第一个参数是tableviewcell,第二个参数是得到屏幕的宽度,这样可以在横屏的时候照样自适应
    [self.tableView startAutoCellHeightWithCellClass:[TableViewCell class] contentViewWidth:[UIScreen mainScreen].bounds.size.width];
    
    return _listArray.count;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    /* model 为模型实例， keyPath 为 model 的属性名，通过 kvc 统一赋值接口 */
    return [self.tableView cellHeightForIndexPath:indexPath model:self.listArray[indexPath.row] keyPath:@"model"];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"test";
    TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
    }
    cell.model = self.listArray[indexPath.row];
    return cell;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

成功之后截图

Simulator Screen Shot 2015年12月1日 下午2.39.32.png