iPhone-如何在视图上动态加载/卸载按钮

我正在编写一个动态加载按钮的应用程序，然后根据应用程序设置中的更改，卸载以前的按钮并加载新按钮。有这样做的最佳实践吗？我遇到了几个问题。。我在另一个论坛上发了帖子，但没有得到决议。我研究了文档，但关键问题是它没有卸载旧按钮并加载新按钮

我遵循的算法是：

在我的视图中，DIDLOAD-->调用重载按钮（这将在视图上定位所有按钮）

当用户更改应用程序设置（在应用程序内）时，我调用： [自动卸载按钮]； [自动重新加载按钮] 守则：

- (void)reloadButtons 
{

  //some code

  xIncrement = 50; //for positioning buttons 
  yIncrement = 50;

  x = 25;
  y = 25;

  for (int i = 1; i <= numOfButtons; i++) {
    tmpButton = [[UIButton alloc] initWithFrame:CGRectMake(x, y, 50, 50)];

    x += xIncrement;
    if (i % 5 == 0) { //if this is the 6th button on the line then go to the next line (increment y)
       x = 25;
       y += yIncrement;
    }

    [tmpButton setTitle:@"title" forState:UIControlStateNormal];
    [tmpButton setTitleColor:[UIColor blackColor] forState: UIControlStateNormal];

    [tmpButton setFont:[UIFont boldSystemFontOfSize:24.0]];

    UIImage * bgImage = [UIImage imageNamed:@"image.png"];
    [tmpButton setBackgroundImage:bgImage forState:UIControlStateNormal];


    [tmpButton addTarget:self action:@selector(tapButton forControlEvents:UIControlEventTouchUpInside];
tmpButton.tag = i + 50;

    [self.view addSubview:tmpButton];

    [tmpButton release];

  } //for loop

  prevNumOfbuttons = numOfButtons; //saves the number of previous buttons since this may change depending on the user's choice in the application settings.

} //reloadButtons

Upon exit from the settings page, I run this unloadButtons function then follow it with the reloadButtons again.. this is where I'm running into the issues.. see my comments within the code below:

- (void)unloadButtons {

   NSLog(@"unloadButtons");

   NSArray *arrSubViews = [self.view subviews];
   int count = [arrSubViews count];

   for (int i = 0; i < count; i++) {
     UIView *vv = [arrSubViews objectAtIndex:i];

     if ([vv isMemberOfClass:[UIButton class]]) {
        NSInteger buttonTag = [vv tag];
        if (buttonTag < 200) { //all buttons that were added in reloadButtons have a tag < 200 - this is to distinguish them from the info button, which was assigned a tag of 203

           NSLog(@"Button Caption: %@", [vv currentTitle]);
           [vv removeFromSuperview];

        }

     }
   } //for loop

[arrSubViews release];

[self.view setNeedsDisplay]; //I added this to see if the reason that the old buttons are not going away is because the view is not refreshing

} //unloadButtons

-（无效）重新加载按钮
{
//一些代码
xIncrement=50；//用于定位按钮
yIncrement=50；
x=25；
y=25；
for（int i=1；我不发布子视图。您没有创建它，只是请求它。谢谢，我这样做了，但这并没有解决为什么旧按钮不会消失而新按钮会出现的问题。