IOS _ 3rd library SDWebImage

IOS _ 3rd library SDWebImage

1. Add the downloaded source code package of the 3rd-party class library SDWebImage to the project.

2. Go to Build Phases of the project and add all. m files in the source code package to the project.

3. Import the built-in frameworks of the 3rd-party Class Library: MapKit. framework and ImageIO. framework.

4. Add the main header file "UIImageView + WebCache. h" of the 3rd-party class library"

Code snippet:

-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) indexPath {static NSString * cellID = @ "Beyond"; UITableViewCell * cell = [tableView progress: cellID]; if (cell = nil) {// if the pool is not obtained, a new cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleSubtitle reuseIdentifier: cellID] is generated.} // set the unique content Status ** s = _ statuses in the cell. [IndexPath. row]; cell. textLabel. text = s. text; cell. detailTextLabel. text = s. user. screenName; cell. textLabel. numberOfLines = 0; // important ~ Using SDWebImage of the 3rd-party framework, the cache policy is: request upon failure, disk cache, and image download suspended when scrollView is rolled [cell. imageView setImageWithURL: [NSURL URLWithString: s. user. profileImageUrl] placeholderImage: [UIImage imageNamed: @ "avatar_default.png"] options: SDWebImageLowPriority | SDWebImageRefreshCached | cached]; // return cell ;}

Key code and Cache Policy:

Request again after failure: SDWebImageRetryFailed

Disk cache: SDWebImageRefreshCached

Pause downloading when scrollView is rolling. Image: SDWebImageLowPriority

[Cell. imageViewSetImageWithURL: [NSURLURLWithString: s. user. profileImageUrl]PlaceholderImage: [UIImageimageNamed: @ "avatar_default.png"]Options: SDWebImageLowPriority | SDWebImageRefreshCached | SDWebImageRetryFailed];