SDWebImage简单使用

蔚落 2023-10-17 06:17 10阅读 0赞

#import "ViewController.h"
    #import "ImageCell.h"
    #import "NSString+MD5.h"
    
    //UIImageView 的图片缓存类别
    #import "UIImageView+WebCache.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        _table.dataSource = self;
        _table.delegate = self;
        _imgDic = [[NSMutableDictionary alloc]init];
        [_table registerNib:[UINib nibWithNibName:@"ImageCell" bundle:nil] forCellReuseIdentifier:@"image"];
        _table.rowHeight = 200;
        _array = [[NSArray alloc]initWithObjects:@"http://tupian.enterdesk.com/uploadfile/2014/1126/20141126102508269.jpg",@"http://image.tianjimedia.com/uploadImages/2014/218/57/652482H64SR7.jpg", @"http://img1.3lian.com/2015/a1/49/d/82.jpg",nil];
    }
    
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    {
        return _array.count;
    }
    
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        ImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"image"];
        NSString *urlString = [_array objectAtIndex:indexPath.row];
        //SDWebImage 是一个图片请求和缓存的第三方库。
        //能够给imageView等控件设置一个在线的图片，这个下载过程异步执行，而且图片会被缓存起来
        [cell.myImgView sd_setImageWithURL:[NSURL URLWithString:urlString]];
        
        //或者以下注释掉的方法
    //    cell.myImgView.image = nil;
    //    NSDictionary *dic = @{@"url":[NSURL URLWithString:urlString],@"imageView":cell.myImgView};
    //    
    //    //去分线程里面下载图片
    //    [NSThread detachNewThreadSelector:@selector(downloadPic:) toTarget:self withObject:dic];
        return cell;
    }
    
    //- (void)downloadPic:(NSDictionary *)dic
    //{
    //    //先检查之前有没有下载过这个URL的图片，如果下载过就直接取出来使用，如果没有下载就下载储存然后使用
    //    NSString *urlString = [[dic objectForKey:@"url"] absoluteString];
    //    UIImageView *imgView = [dic objectForKey:@"imageView"];
    //    
    //    if ([_imgDic objectForKey:[urlString MD5]])
    //    {
    //        //图片存在
    //        imgView.image = [_imgDic objectForKey:[urlString MD5]];
    //    }
    //    else
    //    {
    //        //图片不存在,下载存储使用
    //        NSData *data = [NSData dataWithContentsOfURL:[dic objectForKey:@"url"]];
    //        imgView.image = [UIImage imageWithData:data];
    //        [_imgDic setObject:imgView.image forKey:[urlString MD5]];
    //    }
    //}

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