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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