計(jì)算緩存

NSString *libPath = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
CGFloat fileSize=[self folderSizeAtPath:libPath];
- (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);
}
- (long long)fileSizeAtPath:(NSString*) filePath{
    NSFileManager* manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
    }
    return 0;
}

清除緩存

- (void)action:(id)sender
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *path = [paths lastObject];
    
    NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];
    
    for (NSString *p in files) {
        NSError *error;
        NSString *Path = [path stringByAppendingPathComponent:p];
        if ([[NSFileManager defaultManager] fileExistsAtPath:Path]) {
            //清理緩存，保留Preference，里面含有NSUserDefaults保存的信息
            if (![Path containsString:@"Preferences"]) {
                [[NSFileManager defaultManager] removeItemAtPath:Path error:&error];
            }
        }else{
            
        }
    }
}