iOS开发－图文混排之cell自适应

又被小姑娘问到图文混排怎么做，拿过来看看，也不算纯粹的图文混排了，其实还是cell的自适应，只不过cell里面可能是文字也可能是图片，于是乎开始码代码，啷哩个啷，接口在此（不知道哪来的）：https://api.108tian.com/mobile/v3/SceneDetail?id=528b91c9baf6773975578c5c，看一下json格式的数据：

效果图：

数据嘛，初看有点复杂，不过只要做成自己想要的样子不就好了。
这里有两个点要注意：
1.计算图片大小；
2.计算label的高度；
另外。博主用的AF3.0做的数据请求，有兴趣的可以看看。
这几点在具体代码中都有体现，下面看.m文件：

////  ViewController.m//  cell自适应////  Created by 刘浩浩 on 16/6/8.//  Copyright © 2016年 CodingFire. All rights reserved.//#import "ViewController.h"#import "AFNetwork3.0/AFNetworking/AFNetworking.h"#import "UIImageView+WebCache.h"#import "DataModel.h"#define PICURL @"http://pic.108tian.com/pic/"#define VIEWWIDTH self.view.frame.size.width#define VIEWHEIGHT self.view.frame.size.height@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>{    UITableView *_tableView;    NSMutableArray *_daraArray;}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    _daraArray=[[NSMutableArray alloc]init];    [self loadData];}/* *下载数据 *使用AFNetWorking3.0 */-(void)loadData{    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];    manager.requestSerializer = [AFJSONRequestSerializer serializer];//请求    manager.responseSerializer = [AFHTTPResponseSerializer serializer];//响应    // 设置超时时间    manager.requestSerializer.timeoutInterval = 8.f;    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/json",@"text/html",@"text/plain",@"application/json",nil];    [manager POST:@"https://api.108tian.com/mobile/v3/SceneDetail?id=528b91c9baf6773975578c5c" parameters:nil progress:^(NSProgress *progress)     {     } success:^(NSURLSessionDataTask *_Nullable task,id _Nonnull responseObject)     {         NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];         NSLog(@"%@",dic);         NSDictionary *data=[dic objectForKey:@"data"];         NSDictionary *details=[data objectForKey:@"details"];         NSArray *paragraph=[details objectForKey:@"paragraph"];         for (NSDictionary *subDic in paragraph) {             NSArray *body=[subDic objectForKey:@"body"];             for (NSDictionary *bodySubDic in body) {                 DataModel *dataModel=[[DataModel alloc]init];                 if ([bodySubDic objectForKey:@"text"]!=nil) {                     dataModel.text=[bodySubDic objectForKey:@"text"];                 }                 else                 {                     dataModel.url=[[bodySubDic objectForKey:@"img"] objectForKey:@"url"];                 }                 [_daraArray addObject:dataModel];             }         }         [self initTableView];     }failure:^(NSURLSessionDataTask*_Nullable task,NSError *error)     {         NSLog(@"%@",error);     }];}/* * *UITableView初始化 * */-(void)initTableView{    _tableView=[[UITableView alloc]initWithFrame:CGRectMake(0, 0, VIEWWIDTH, VIEWHEIGHT) style:UITableViewStylePlain];    _tableView.delegate=self;    _tableView.dataSource=self;    [self.view addSubview:_tableView];    [_tableView reloadData];}#pragma mark - UITableViewDelegate-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _daraArray.count ;}-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    DataModel *dataModel=[_daraArray objectAtIndex:indexPath.row];    if (dataModel.text!=nil) {        NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:13]};        CGSize size = [dataModel.text boundingRectWithSize:CGSizeMake(VIEWWIDTH-20, 0) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil].size;        return size.height+10;    }    else    {        CGSize size=[[self class]getImageSizeWithURL:[NSString stringWithFormat:@"%@%@",PICURL,dataModel.url]];        if (size.width>(VIEWWIDTH-20)) {            return size.height/(size.width/(VIEWWIDTH-20))+10;        }        else        {            return size.height*((VIEWWIDTH-20)/size.width)+10;        }    }}-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *cellIdentify=@"cell";    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentify];    if (!cell) {        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentify];    }    for (UIView *view in cell.contentView.subviews) {        [view removeFromSuperview];    }    cell.selectionStyle=UITableViewCellSelectionStyleNone;    tableView.separatorStyle=UITableViewCellSeparatorStyleNone;    DataModel *dataModel=[_daraArray objectAtIndex:indexPath.row];    if (dataModel.text!=nil) {        NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:13]};        CGSize size = [dataModel.text boundingRectWithSize:CGSizeMake(VIEWWIDTH-10, 0) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil].size;        UILabel *contentLabel=[[UILabel alloc]initWithFrame:CGRectMake(10, 10, VIEWWIDTH-20, size.height)];        contentLabel.text=dataModel.text;        contentLabel.numberOfLines=0;        contentLabel.textColor=[UIColor blackColor];        contentLabel.font=[UIFont systemFontOfSize:13];        [cell.contentView addSubview:contentLabel];    }    else    {        UIImageView *imageView=[[UIImageView alloc]init];        [imageView sd_setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",PICURL,dataModel.url]]];        CGSize size=[[self class]getImageSizeWithURL:[NSString stringWithFormat:@"%@%@",PICURL,dataModel.url]];        if (size.width>(VIEWWIDTH-20)) {            imageView.frame=CGRectMake(10, 10, VIEWWIDTH-20, size.height/(size.width/(VIEWWIDTH-20)));        }        else        {            imageView.frame=CGRectMake(10, 10, VIEWWIDTH-20, size.height*((VIEWWIDTH-20)/size.width));        }        [cell.contentView addSubview:imageView];    }    return cell;}#pragma mark - 根据图片url获取图片尺寸+(CGSize)getImageSizeWithURL:(id)imageURL{    NSURL* URL = nil;    if([imageURL isKindOfClass:[NSURL class]]){        URL = imageURL;    }    if([imageURL isKindOfClass:[NSString class]]){        URL = [NSURL URLWithString:imageURL];    }    if(URL == nil)        return CGSizeZero;                  // url不正确返回CGSizeZero    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:URL];    NSString* pathExtendsion = [URL.pathExtension lowercaseString];    CGSize size = CGSizeZero;    if([pathExtendsion isEqualToString:@"png"]){        size =  [self getPNGImageSizeWithRequest:request];    }    else if([pathExtendsion isEqual:@"gif"])    {        size =  [self getGIFImageSizeWithRequest:request];    }    else{        size = [self getJPGImageSizeWithRequest:request];    }    if(CGSizeEqualToSize(CGSizeZero, size))                    // 如果获取文件头信息失败,发送异步请求请求原图    {        NSData* data = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:URL] returningResponse:nil error:nil];        UIImage* image = [UIImage imageWithData:data];        if(image)        {            size = image.size;        }    }    return size;}//  获取PNG图片的大小+(CGSize)getPNGImageSizeWithRequest:(NSMutableURLRequest*)request{    [request setValue:@"bytes=16-23" forHTTPHeaderField:@"Range"];    NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    if(data.length == 8)    {        int w1 = 0, w2 = 0, w3 = 0, w4 = 0;        [data getBytes:&w1 range:NSMakeRange(0, 1)];        [data getBytes:&w2 range:NSMakeRange(1, 1)];        [data getBytes:&w3 range:NSMakeRange(2, 1)];        [data getBytes:&w4 range:NSMakeRange(3, 1)];        int w = (w1 << 24) + (w2 << 16) + (w3 << 8) + w4;        int h1 = 0, h2 = 0, h3 = 0, h4 = 0;        [data getBytes:&h1 range:NSMakeRange(4, 1)];        [data getBytes:&h2 range:NSMakeRange(5, 1)];        [data getBytes:&h3 range:NSMakeRange(6, 1)];        [data getBytes:&h4 range:NSMakeRange(7, 1)];        int h = (h1 << 24) + (h2 << 16) + (h3 << 8) + h4;        return CGSizeMake(w, h);    }    return CGSizeZero;}//  获取gif图片的大小+(CGSize)getGIFImageSizeWithRequest:(NSMutableURLRequest*)request{    [request setValue:@"bytes=6-9" forHTTPHeaderField:@"Range"];    NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    if(data.length == 4)    {        short w1 = 0, w2 = 0;        [data getBytes:&w1 range:NSMakeRange(0, 1)];        [data getBytes:&w2 range:NSMakeRange(1, 1)];        short w = w1 + (w2 << 8);        short h1 = 0, h2 = 0;        [data getBytes:&h1 range:NSMakeRange(2, 1)];        [data getBytes:&h2 range:NSMakeRange(3, 1)];        short h = h1 + (h2 << 8);        return CGSizeMake(w, h);    }    return CGSizeZero;}//  获取jpg图片的大小+(CGSize)getJPGImageSizeWithRequest:(NSMutableURLRequest*)request{    [request setValue:@"bytes=0-209" forHTTPHeaderField:@"Range"];    NSData* data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    if ([data length] <= 0x58) {        return CGSizeZero;    }    if ([data length] < 210) {// 肯定只有一个DQT字段        short w1 = 0, w2 = 0;        [data getBytes:&w1 range:NSMakeRange(0x60, 0x1)];        [data getBytes:&w2 range:NSMakeRange(0x61, 0x1)];        short w = (w1 << 8) + w2;        short h1 = 0, h2 = 0;        [data getBytes:&h1 range:NSMakeRange(0x5e, 0x1)];        [data getBytes:&h2 range:NSMakeRange(0x5f, 0x1)];        short h = (h1 << 8) + h2;        return CGSizeMake(w, h);    } else {        short word = 0x0;        [data getBytes:&word range:NSMakeRange(0x15, 0x1)];        if (word == 0xdb) {            [data getBytes:&word range:NSMakeRange(0x5a, 0x1)];            if (word == 0xdb) {// 两个DQT字段                short w1 = 0, w2 = 0;                [data getBytes:&w1 range:NSMakeRange(0xa5, 0x1)];                [data getBytes:&w2 range:NSMakeRange(0xa6, 0x1)];                short w = (w1 << 8) + w2;                short h1 = 0, h2 = 0;                [data getBytes:&h1 range:NSMakeRange(0xa3, 0x1)];                [data getBytes:&h2 range:NSMakeRange(0xa4, 0x1)];                short h = (h1 << 8) + h2;                return CGSizeMake(w, h);            } else {// 一个DQT字段                short w1 = 0, w2 = 0;                [data getBytes:&w1 range:NSMakeRange(0x60, 0x1)];                [data getBytes:&w2 range:NSMakeRange(0x61, 0x1)];                short w = (w1 << 8) + w2;                short h1 = 0, h2 = 0;                [data getBytes:&h1 range:NSMakeRange(0x5e, 0x1)];                [data getBytes:&h2 range:NSMakeRange(0x5f, 0x1)];                short h = (h1 << 8) + h2;                return CGSizeMake(w, h);            }        } else {            return CGSizeZero;        }    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

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