清除缓存功能

分手后的思念是犯贱 2022-08-20 08:19 50阅读 0赞

代码有点多，可以写一个工具类继承自NSObject  
工具类.h文件

#import <Foundation/Foundation.h>
    #import "UIImageView+WebCache.h"
    @interface ClearCacheTool : NSObject
    
    +(float)fileSizeAtPath:(NSString *)path;
    +(float)folderSizeAtPath:(NSString *)path;
    +(void)clearCache:(NSString *)path;
    
    @end

工具类.m文件

//计算单个文件大小
    +(float)fileSizeAtPath:(NSString *)path{
        NSFileManager *fileManager=[NSFileManager defaultManager];
        if([fileManager fileExistsAtPath:path]){
            long long size=[fileManager attributesOfItemAtPath:path error:nil].fileSize;
            return size/1024.0/1024.0;
        }
        return 0;
    }
    
    //计算目录大小
    +(float)folderSizeAtPath:(NSString *)path{
        NSFileManager *fileManager=[NSFileManager defaultManager];
        float folderSize;
        if ([fileManager fileExistsAtPath:path]) {
            NSArray *childerFiles=[fileManager subpathsAtPath:path];
            for (NSString *fileName in childerFiles) {
                NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
                folderSize +=[ClearCacheTool fileSizeAtPath:absolutePath];
            }
            //SDWebImage框架自身计算缓存的实现
            folderSize+=[[SDImageCache sharedImageCache] getSize]/1024.0/1024.0;
            return folderSize;
        }
        return 0;
    }
    //清理文件
    +(void)clearCache:(NSString *)path{
        NSFileManager *fileManager=[NSFileManager defaultManager];
        if ([fileManager fileExistsAtPath:path]) {
            NSArray *childerFiles=[fileManager subpathsAtPath:path];
            for (NSString *fileName in childerFiles) {
                //如有需要，加入条件，过滤掉不想删除的文件
                NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
                [fileManager removeItemAtPath:absolutePath error:nil];
            }
        }
        [[SDImageCache sharedImageCache] cleanDisk];
    }

在控制器里实现

#import "ClearCacheTool.h"
    @interface ViewController ()<UIAlertViewDelegate>
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
    }
    - (IBAction)clear:(id)sender {
        //清除Caches文件夹的文件
        NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
        NSLog(@"cachePath=%@",cachePath);
        float foldersize = [ClearCacheTool folderSizeAtPath:cachePath];
        if (foldersize>0) {
            NSString *altStr = [NSString stringWithFormat:@"缓存大小为%.2fM,确定要清理缓存吗？",foldersize];
            UIAlertView *altView = [[UIAlertView alloc]initWithTitle:@"提示" message:altStr delegate:self cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];
            [altView show];
        }
    
    }
    - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
        if (buttonIndex == 1) {
    
        }else{
            NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
            [ClearCacheTool clearCache:cachePath];
        }
    }