ios-清理应用缓存

来源：互联网发布：长绸扇子淘宝编辑：程序博客网时间：2024/04/30 11:41

思路：清除沙盒缓存文件夹下的内容
实现功能：清理缓存，计算并提示用户清理了多少缓存
代码实现：（自己申明记录缓存大小的变量）

1.获取沙盒缓存路径，开启线程进行清理操作

//清除缓存- (void)clear{    dispatch_async(                   dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)                   , ^{                       // 获取沙盒路径                       NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];                       NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];//                       NSLog(@"files :%lu",[files count]);                       _cacheSize=[self folderSizeAtPath:cachPath];                       for (NSString *p in files) {                           NSError *error;                           NSString *path = [cachPath stringByAppendingPathComponent:p];                           if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {                               [[NSFileManager defaultManager] removeItemAtPath:path error:&error];                           }                       }                       [self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});}

2.在上面的方法中需要计算清理了多少缓存，下面两个方法结合实现这个功能

// 计算缓存文件夹大小- (float ) folderSizeAtPath:(NSString*) folderPath{    NSFileManager* manager = [NSFileManager defaultManager];    if (![manager fileExistsAtPath:folderPath]) return 0;    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];    NSString* fileName;    long long folderSize = 0;    while ((fileName = [childFilesEnumerator nextObject]) != nil){        NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];        folderSize += [self fileSizeAtPath:fileAbsolutePath];    }    return folderSize/(1024.0*1024.0);}// 计算缓存文件大小- (long long) fileSizeAtPath:(NSString*) filePath{    NSFileManager* manager = [NSFileManager defaultManager];    if ([manager fileExistsAtPath:filePath]){        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];    }    return 0;}

3.提示用户清理成功

// 提示用户清理成功-(void)clearCacheSuccess{    NSString *info = [NSString stringWithFormat:@"成功清理%.2fMb缓存",_cacheSize];    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"清除成功" message:info preferredStyle:UIAlertControllerStyleAlert];    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:nil];    [alert addAction:okAction];    [self presentViewController:alert animated:YES completion:nil];}

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