Question

我看过selector as parameter in IOS帖子。但是，我想扩展这个问题。

就我而言，我正在创建一个Objective-C（不是Swift）Master / Detail应用程序，并希望使用以下init函数创建UIViewController类型的DetailController对象

在DetailViewController.h中

@interfact DetailViewController : UIViewController
- (id)initWithNibName:(NSString *)nibName withSaveSelector:(SEL)saveSelector
@end

...并在DetailViewController.m

中

- (id)initWithNibName:(NSString *)nibName withSaveSelector:(SEL)saveSelector
{
  self = [super initWithNibName:nibName bundle:nil];
  if (self) {
        UIBarButtonItem *done = [[UIBarButtonItem alloc]
                                 initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                 target:self
                                 action:saveSelector];
        [[self navigationItem] setRightBarButtonItem:done animated:YES];
  }
  return self;
}

现在，我想继续重复使用上面的代码来创建不同的DetailViewControllers，并希望传递一个saveSelector函数，当用户按下“完成”按钮时将调用该函数。

现在我有另一个视图控制器

@interface AnotherViewController : UIViewController
- (void)saveSelector:(id)sender;
@end

...然后在另一个对象（即不在AnotherViewController.m代码中），我使用上面的视图控制器，就像这样...

AnotherViewController *avc = [[AnotherViewController alloc] init];
DetailViewController *dvc = [[DetailViewController alloc] initWithNibName:@"AnotherViewController" withSaveSelector:@selector(???)];

我该怎么办？所以我可以将AnotherViewController :: saveSelector（）函数传递给DetailViewController？

我希望这是有道理的。

Answer 1

将您的方法更改为：

DetailViewController *dvc = [[DetailViewController alloc] initWithNibName:@"AnotherViewController" withSaveSelector:@selector(saveSelector:) forTarget:avc];

并称之为：

DetailViewController.m

在- (id)initWithNibName:(NSString *)nibName withSaveSelector:(SEL)saveSelector forTarget:(id)target { self = [super initWithNibName:nibName bundle:nil]; if (self) { UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:target action:saveSelector]; [[self navigationItem] setRightBarButtonItem:done animated:YES]; } return self; }

$query = $conn->prepare("select * from contents JOIN users ON contents.publisher_id = users.id 
     WHERE trend = 1 order by content_id desc limit 20");
$query->execute();

$data = array();
while($result= $query->fetch(PDO::FETCH_ASSOC)) {
$data[] = array("content_id"    =>$result['content_id'], 
                "publisher_id"  =>$result['publisher_id'],
                "publisher_name"=>$result['name'],
                "publisher_rank"=>$result['rank'],
                "title"         =>$result['title'],
                "category"      =>$result['category'],
                "type"          =>$result['type']
                );

};
echo json_encode($data);

如何在IOS中将另一个对象的功能作为选择器？

1 个答案: