SDWebImage的使用

SDWebImage的三个常用方法

//赋值网络图片:
    NSString * imageString = [NSString stringWithFormat:@"%@%@",baseUrl,shop.shop_image];
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] placeholderImage:[UIImage imageNamed:@"defaultImage"]];
    
    
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        
        NSLog(@"下载完成");
    
    }];
    
    //SDWebImage提供了获取下载进度的方法:
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] placeholderImage:[UIImage imageNamed:@"defaultImage"] options:SDWebImageRetryFailed | SDWebImageLowPriority progress:^(NSInteger receivedSize, NSInteger expectedSize) {
        
        //获取图片下载进度:
        NSLog(@"%ld" , receivedSize / expectedSize);
        
    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        
        NSLog(@"下载完成");
        
    }];

#import "ViewController.h"
#import "Masonry.h"
#import "ShopCell.h"
#import "UIImageView+WebCache.h"    //导入SDWebImage
static NSString * baseUrl = @"http://192.168.XX.XX/images/";  //网络接口地址

@interface ViewController ()
@property (nonatomic, strong) NSArray * datalist;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.tableView registerClass:[ShopCell class] forCellReuseIdentifier:NSStringFromClass([ShopCell class])];
    self.tableView.rowHeight = 100;
}


- (NSArray *)datalist
{
    if (!_datalist)
    {
        _datalist = [ShopEntity loadShopData];
    }
    return _datalist;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.datalist.count;
}


#pragma mark - <UITableViewDataSource>
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    ShopCell * cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([ShopCell class])];
    ShopEntity * shop = self.datalist[indexPath.row];
    //赋值主标题:
    cell.nameLabel.text = shop.shop_name;
    //赋值副标题:
    cell.descLabel.text = shop.shop_desc;
    
    //赋值网络图片:
    NSString * imageString = [NSString stringWithFormat:@"%@%@",baseUrl,shop.shop_image];
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] placeholderImage:[UIImage imageNamed:@"defaultImage"]];
    
    
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        
        NSLog(@"下载完成");
    
    }];
    
    //SDWebImage提供了获取下载进度的方法:
    [cell.iconView sd_setImageWithURL:[NSURL URLWithString:imageString] placeholderImage:[UIImage imageNamed:@"defaultImage"] options:SDWebImageRetryFailed | SDWebImageLowPriority progress:^(NSInteger receivedSize, NSInteger expectedSize) {
        
        //获取图片下载进度:
        NSLog(@"%ld" , receivedSize / expectedSize);
        
    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        
        NSLog(@"下载完成");
        
    }];
    
    return cell;
    
}


#pragma mark - <UITableViewDelegate>
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

//options 图片缓存策略
/*
 options所有选项：
 //失败后重试
 SDWebImageRetryFailed = 1 << 0,
       
 //UI交互期间开始下载，导致延迟下载比如UIScrollView减速。
 SDWebImageLowPriority = 1 << 1,
       
 //只进行内存缓存
 SDWebImageCacheMemoryOnly = 1 << 2,
       
 //这个标志可以渐进式下载,显示的图像是逐步在下载
 SDWebImageProgressiveDownload = 1 << 3,
       
 //刷新缓存
 SDWebImageRefreshCached = 1 << 4,
       
 //后台下载
 SDWebImageContinueInBackground = 1 << 5,
       
 //优先下载
 SDWebImageHighPriority = 1 << 8,
       
 //延迟占位符
 SDWebImageDelayPlaceholder = 1 << 9,
       
 //改变动画形象
 SDWebImageTransformAnimatedImage = 1 << 10,
 
 */

@end

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