NSString *path = [NSString stringWithFormat:@"%@%@",NSHomeDirectory(),@"/Library/Caches/"];
//2.創建文件管理者
NSFileManager *manager = [NSFileManager defaultManager];
//3.獲取文件夾下所有的子路徑
NSArray *allPath =[manager subpathsAtPath:path];
//4.遍歷所有的子路徑
for (NSString *subPath in allPath) {
}