计算缓存文件大小、清除缓存的Cell

计算缓存文件大小

- (void)getCacheSize
{
    // 总大小
    unsigned long long size = 0;
    
    // 获得缓存文件夹路径
    NSString *cachesPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
    NSString *dirpath = [cachesPath stringByAppendingPathComponent:@"MP3"];
    
    // 文件管理者
    NSFileManager *mgr = [NSFileManager defaultManager];
    
    // 获得文件夹的大小  == 获得文件夹中所有文件的总大小
//    XMGLog(@"contents - %@", [mgr contentsOfDirectoryAtPath:dirpath error:nil]);
    NSArray *subpaths = [mgr subpathsAtPath:dirpath];
    for (NSString *subpath in subpaths) {
        // 全路径
        NSString *fullSubpath = [dirpath stringByAppendingPathComponent:subpath];
        // 累加文件大小
        size += [mgr attributesOfItemAtPath:fullSubpath error:nil].fileSize;
        
//        NSDictionary *attrs = [mgr attributesOfItemAtPath:fullSubpath error:nil];
//        size += [attrs[NSFileSize] unsignedIntegerValue];
    }
    
    NSLog(@"%zd", size);
}

 计算缓存文件大小工具封装 （可给NSString增加分类)

//声明
- (unsigned long long)fileSize;

//实现
- (unsigned long long)fileSize
{
    // 总大小
    unsigned long long size = 0;
    
    // 文件管理者
    NSFileManager *mgr = [NSFileManager defaultManager];
    
    // 是否为文件夹
    BOOL isDirectory = NO;
    
    // 路径是否存在
    BOOL exists = [mgr fileExistsAtPath:self isDirectory:&isDirectory];
    if (!exists) return size;
    
    if (isDirectory) { // 文件夹
        // 获得文件夹的大小  == 获得文件夹中所有文件的总大小
        NSDirectoryEnumerator *enumerator = [mgr enumeratorAtPath:self];
        for (NSString *subpath in enumerator) {
            // 全路径
            NSString *fullSubpath = [self stringByAppendingPathComponent:subpath];
            // 累加文件大小
            size += [mgr attributesOfItemAtPath:fullSubpath error:nil].fileSize;
        }
    } else { // 文件
        size = [mgr attributesOfItemAtPath:self error:nil].fileSize;
    }
    
    return size;
}

 清除缓存的Cell 自定义Cell 声明与实现

//
//  JGClearCacheCell.h
//
//
//  Created by JG on 16/12/08.
//  Copyright © 2016年 JG. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface JGClearCacheCell : UITableViewCell

@end




//
//  JGClearCacheCell.m
//  
//
//  Created by JG on 16/12/08.
//  Copyright © 2016年 JG. All rights reserved.
//

#import "JGClearCacheCell.h"
#import <SDImageCache.h>
#import <SVProgressHUD.h>

#define JGCustomCacheFile [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"Custom"]

@implementation JGClearCacheCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        // 设置cell右边的指示器(用来说明正在处理一些事情)
        UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [loadingView startAnimating];
        self.accessoryView = loadingView;
        
        // 设置cell默认的文字(如果设置文字之前userInteractionEnabled=NO, 那么文字会自动变成浅灰色)
        self.textLabel.text = @"清除缓存(正在计算缓存大小...)";
        
        // 禁止点击
        self.userInteractionEnabled = NO;
        
//        int age = 10;
//        typeof(age) age2 = 10;
        
//        __weak JGClearCacheCell * weakSelf = self;
        __weak typeof(self) weakSelf = self;
        
        // 在子线程计算缓存大小
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            [NSThread sleepForTimeInterval:2.0];
            
            // 获得缓存文件夹路径
            unsigned long long size = JGCustomCacheFile.fileSize;
            size += [SDImageCache sharedImageCache].getSize;
            
            // 如果cell已经销毁了, 就直接返回
            if (weakSelf == nil) return;
            
            NSString *sizeText = nil;
            if (size >= pow(10, 9)) { // size >= 1GB
                sizeText = [NSString stringWithFormat:@"%.2fGB", size / pow(10, 9)];
            } else if (size >= pow(10, 6)) { // 1GB > size >= 1MB
                sizeText = [NSString stringWithFormat:@"%.2fMB", size / pow(10, 6)];
            } else if (size >= pow(10, 3)) { // 1MB > size >= 1KB
                sizeText = [NSString stringWithFormat:@"%.2fKB", size / pow(10, 3)];
            } else { // 1KB > size
                sizeText = [NSString stringWithFormat:@"%zdB", size];
            }
            
            // 生成文字
            NSString *text = [NSString stringWithFormat:@"清除缓存(%@)", sizeText];
            
            // 回到主线程
            dispatch_async(dispatch_get_main_queue(), ^{
                // 设置文字
                weakSelf.textLabel.text = text;
                // 清空右边的指示器
                weakSelf.accessoryView = nil;
                // 显示右边的箭头
                weakSelf.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
                
                // 添加手势监听器
                [weakSelf addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:weakSelf action:@selector(clearCache)]];
                
                // 恢复点击事件
                weakSelf.userInteractionEnabled = YES;
            });
        });
    }
    return self;
}

/**
 *  清除缓存
 */
- (void)clearCache
{
    // 弹出指示器
    [SVProgressHUD showWithStatus:@"正在清除缓存..." maskType:SVProgressHUDMaskTypeBlack];
    
    // 删除SDWebImage的缓存
    [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
        // 删除自定义的缓存
        dispatch_async(dispatch_get_global_queue(0, 0), ^{
            NSFileManager *mgr = [NSFileManager defaultManager];
            [mgr removeItemAtPath:JGCustomCacheFile error:nil];
            [mgr createDirectoryAtPath:JGCustomCacheFile withIntermediateDirectories:YES attributes:nil error:nil];
            
            // 所有的缓存都清除完毕
            dispatch_async(dispatch_get_main_queue(), ^{
                // 隐藏指示器
                [SVProgressHUD dismiss];
                
                // 设置文字
                self.textLabel.text = @"清除缓存(0B)";
            });
        });
    }];
}

/**
 *  当cell重新显示到屏幕上时, 也会调用一次layoutSubviews
 */
- (void)layoutSubviews
{
    [super layoutSubviews];
    
    // cell重新显示的时候, 继续转圈圈
    UIActivityIndicatorView *loadingView = (UIActivityIndicatorView *)self.accessoryView;
    [loadingView startAnimating];
}

@end