清除缓存功能

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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];    }}

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