首先应该获取缓存路径, 然后计算缓存的总大小, 最后在利用 for 循环, 逐个删除缓存文件夹里面的文件
下面附上完整的代码例子
- // 清除缓存按钮的点击事件
- - (void)putBufferBtnClicked:(UIButton *)btn{
- 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];}
- // 计算目录大小 -
- -(CGFloat)folderSizeAtPath:(NSString *)path{
- // 利用 NSFileManager 实现对文件的管理
- 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];
- }
- }
来源: http://www.bubuko.com/infodetail-2522834.html