转自：http://www.cnblogs.com/qianLL/p/5389079.html

具体效果如下

1.找到 SDWebImage找到SDImageCache类

添加如下方法

- (float)checkTmpSize
{
    float totalSize = 0;
    NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:_diskCachePath];
    for (NSString *fileName in fileEnumerator)
    {
        NSString *filePath = [_diskCachePath stringByAppendingPathComponent:fileName];

        NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];

        unsigned long long length = [attrs fileSize];

        totalSize += length / 1024.0 / 1024.0;
    }
    //    NSLog(@"tmp size is %.2f",totalSize);

    return totalSize;
}

具体用tableView实现

#import <UIKit/UIKit.h>
@interface MoreViewController : UITableViewController<UITableViewDelegate,UITableViewDataSource>

@end

#import "MoreViewController.h"

@interface MoreViewController ()
@property(nonatomic,strong)NSArray *titleMore;
@property(nonatomic,strong)NSArray *image;
@property(nonatomic,assign)NSIndexPath* indexPath;
@property(nonatomic,strong)UILabel *lbl;
@property(nonatomic,assign)float mpSize;

@end

@implementation MoreViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [email protected]"更多";
    [email protected][@"清除缓存",@"给个评价",@"商务合作",@"检测新版本",@"欢迎页",@"关于"];
   [email protected][@"moreClear",@"moreScore",@"moreBusiness",@"moreVersion",@"moreWelcome",@"moreAbout"];
    self.tableView.backgroundColor=[UIColor blackColor];
    self.tableView.scrollEnabled=NO;
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"More"];
    self.lbl=[[UILabel alloc]init];
    self.lbl.textColor=[UIColor whiteColor];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return self.titleMore.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"More" forIndexPath:indexPath];

    if (indexPath.row==0) {
          self.lbl.text=[NSString stringWithFormat:@"缓存为%.2fMB",[[SDImageCache sharedImageCache] checkTmpSize]];
        self.lbl.frame=CGRectMake(200, 10, 200, 10);
        [cell addSubview:self.lbl];
    }
    cell.imageView.image=[UIImage imageNamed:self.image[indexPath.row]];
    cell.textLabel.text=self.titleMore[indexPath.row];
    cell.textLabel.textColor=[UIColor whiteColor];
    cell.backgroundColor=[UIColor blackColor];
    return cell;

}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:YES];
    [self.tableView reloadData];
}

//弹出框 确定是否清除缓存
-(void)alertView{

    NSLog(@"----");
    float tmpSize=[[SDImageCache sharedImageCache] checkTmpSize];

    UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"提示" message:[NSString stringWithFormat:@"清理缓存(%.2fM)",tmpSize] preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *ok=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [[SDImageCache sharedImageCache] clearDisk];
//        [self.tableView reloadRowsAtIndexPaths:@[self.indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [self.tableView reloadData];

    }];

    UIAlertAction *cancle=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:nil];

    [alert addAction:ok];
    [alert addAction:cancle];
    [self presentViewController:alert animated:YES completion:nil];

}

// 选择第一列
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    if (indexPath.row==0) {
        [self alertView];

    }
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/