- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 {
 if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
  // 设置加载视图
  UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
  [loadingView startAnimating];
  self.accessoryView = loadingView;

  //设置文字
  self.textLabel.text = @"清楚缓存";
  self.detailTextLabel.text = @"正在计算"; 
 }
 return self;
}

unsigned long long size =
[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"CustomFile"].fileSize;
//fileSize是封装在Category中的。

size += [SDImageCache sharedImageCache].getSize; //CustomFile + SDWebImage 缓存

//设置文件大小格式
NSString sizeText = nil;
if (size >= pow(10, 9)) {
 sizeText = [NSString stringWithFormat:@"%.2fGB", size / pow(10, 9)];
}else if (size >= pow(10, 6)) {
 sizeText = [NSString stringWithFormat:@"%.2fMB", size / pow(10, 6)];
}else if (size >= pow(10, 3)) {
 sizeText = [NSString stringWithFormat:@"%.2fKB", size / pow(10, 3)];
}else {
 sizeText = [NSString stringWithFormat:@"%zdB", size];
}

//计算完成后，回到主线程继续处理，显示文件大小，除去加载视图，显示箭头，添加点击事件
dispatch_async(dispatch_get_main_queue(), ^{

 self.detailTextLabel.text = [NSString stringWithFormat:@"%@",sizeText];
 self.accessoryView = nil;
 self.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

 [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clearCacheClick)]];   
 });

- (void)clearCacheClick
{
 [SVProgressHUD showWithStatus:@"正在清除缓存···"];
 [SVProgressHUD setDefaultMaskType:SVProgressHUDMaskTypeBlack];

 [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
  dispatch_async(dispatch_get_global_queue(0, 0), ^{

   NSFileManager *mgr = [NSFileManager defaultManager];
   [mgr removeItemAtPath:GYLCustomFile error:nil];
   [mgr createDirectoryAtPath:GYLCustomFile withIntermediateDirectories:YES attributes:nil error:nil];

   dispatch_async(dispatch_get_main_queue(), ^{

    [SVProgressHUD dismiss];

    // 设置文字
    self.detailTextLabel.text = nil;    
   });   
  });
 }];
}