iOS经典讲解之清除缓存文件

来源：互联网发布：电脑有声阅读软件编辑：程序博客网时间：2024/05/17 23:02

作者：Loving_iOS

转载请标明出处：http://blog.csdn.net/loving_ios/article/details/49251321

清除缓存之前先要计算文件的大小：

// 计算目录大小- (CGFloat)folderSizeAtPath:(NSString *)path{// 利用NSFileManager实现对文件的管理</span> NSFileManager *manager = [NSFileManager defaultManager]; CGFloat size = 0; if ([manager fileExistsAtPath:path]) {// 获取该目录下的文件，计算其大小 NSArray *childrenFile = [manager subpathsAtPath:path]; for (NSString *fileName in childrenFile) { NSString *absolutePath = [path stringByAppendingPathComponent:fileName]; size += [manager attributesOfItemAtPath:absolutePath error:nil].fileSize; }// 将大小转化为M return size / 1024.0 / 1024.0; } return 0;

// 根据路径删除文件- (void)cleanCaches:(NSString *)path{    // 利用NSFileManager实现对文件的管理    NSFileManager *fileManager = [NSFileManager defaultManager];    if ([fileManager fileExistsAtPath:path]) {        // 获取该路径下面的文件名        NSArray *childrenFiles = [fileManager subpathsAtPath:path];        for (NSString *fileName in childrenFiles) {            // 拼接路径            NSString *absolutePath = [path stringByAppendingPathComponent:fileName];// 将文件删除            [fileManager removeItemAtPath:absolutePath error:nil];        }    }}

计算沙盒中文件的大小并删除沙盒中文件的例子：

- (void)cleanCaches{    [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject];    [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).firstObject];    [self cleanCaches:NSTemporaryDirectory()];}// 清除缓存               CGFloat size = [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSTemporaryDirectory()];                        NSString *message = size > 1 ? [NSString stringWithFormat:@"缓存%.2fM, 删除缓存", size] : [NSString stringWithFormat:@"缓存%.2fK, 删除缓存", size * 1024.0];                        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:(UIAlertControllerStyleAlert)];            UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {                [self cleanCaches];            }];            UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];            [alert addAction:action];            [alert addAction:cancel];            [self showDetailViewController:alert sender:nil];

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