IOS 初学笔记 之 网络图片加载（cell 及单张）

//加载网络图片

首先需下载 SDWebImage 包

自行百度

适合单张加载

[cell.imageView sd_setImageWithURL:[NSURLURLWithString:_txArr[indexPath.section]] placeholderImage:[UIImage imageNamed:@"icon_bottom_menu_user"]]

多张连续加载图片并设置圆角及大小

[cell.imageViewsd_setImageWithURL:[NSURLURLWithString:[_txArrobjectAtIndex:indexPath.section]] placeholderImage:[UIImageimageNamed:@"icon_bottom_menu_user"] completed:^(UIImage *image, NSError*error, SDImageCacheTypecacheType, NSURL*imageURL) {

        CGSize itemSize = CGSizeMake(40, 40);

        UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);

        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);

        [cell.imageView.imagedrawInRect:imageRect];

        cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();

    }];

cell.imageView.contentMode = UIViewContentModeScaleAspectFill; cell.clipsToBounds = YES;

 

//      //修改图片大小

        CGSize itemSize = CGSizeMake(40, 40);

        UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);

        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width,itemSize.height);

        [cell.imageView.imagedrawInRect:imageRect];

        cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();

//        //        //设置圆角

        CALayer *cellImageLayer = cell.imageView.layer;

        [cellImageLayer setCornerRadius:20];

        [cellImageLayer setMasksToBounds:YES];

       cell.accessoryType=UITableViewCellAccessoryNone;