剪切文件的两种方法

1.一般实现

- (void)moveFile {
    NSString *from = @"/Users/dianjoy/Desktop/from";
    NSString *to = @"/Users/dianjoy/Desktop/to";
    
    NSFileManager *manager = [NSFileManager defaultManager];
    //遍历这个目录的第一种方法
    NSArray *subpaths = [manager subpathsAtPath:from];
    NSLog(@"%@", subpaths);
    
//    //遍历这个目录的第二种方法（深度遍历，会递归枚举它的内容）
//    NSDirectoryEnumerator *enumer1 = [manager enumeratorAtPath:from];
//    //遍历这个目录的第三种方法（不递归枚举文件夹种的内容）
//    NSDirectoryEnumerator *enumer2 = [manager directoryContentsAtPath:from];
//    for (NSDirectoryEnumerator *en in enumer1) {
//        NSLog(@"%@", en);
//    }
    
    NSInteger count = [subpaths count];
    for (NSInteger i = 0; i < count; i++) {
        NSString *subpath = subpaths[i];
        
        NSString *fullPath = [from stringByAppendingPathComponent:subpath];
        NSString *fileName = [to stringByAppendingPathComponent:subpath];
        
        //剪切
        [manager moveItemAtPath:fullPath toPath:fileName error:nil];
        
    }
}

2.快速迭代（开多个线程并发完成迭代操作）

- (void)moveFile1 {
    NSString *from = @"/Users/dianjoy/Desktop/from";
    NSString *to = @"/Users/dianjoy/Desktop/to";
    
    NSFileManager *manager = [NSFileManager defaultManager];
    NSArray *subpaths = [manager subpathsAtPath:from];
    NSLog(@"%@", subpaths);
    
    NSInteger count = [subpaths count];
    
    //创建队列（并发队列）
    dispatch_queue_t queue = dispatch_queue_create("com.downloadqueue", DISPATCH_QUEUE_CONCURRENT);
    
    dispatch_apply(count, queue, ^(size_t index) {
        NSString *subpath = subpaths[index];
        
        NSString *fullPath = [from stringByAppendingPathComponent:subpath];
        NSString *fileName = [to stringByAppendingPathComponent:subpath];
        
        //剪切
        [manager moveItemAtPath:fullPath toPath:fileName error:nil];
        
        NSLog(@"%@", [NSThread currentThread]);
    });
}