NSString 到类实例变量

发布于 2024-12-18 01:42:46 字数 236 浏览 2 评论 0原文

我正在寻找一种从 NSString 转换为类实例变量的方法。对于下面的示例代码，假设过滤器是“colorFilter”。我希望将这里的filternameclassinstancegohere 替换为colorFilter。

- (void)filterSelected:(NSString *)filter
{
    self.filternameclassinstancegohere = ….;
}

原文

I am looking for a way to convert from NSString to a class instance variable. For sample code below, say filter is "colorFilter". I want filternameclassinstancegohere to be replaced with colorFilter.

- (void)filterSelected:(NSString *)filter
{
    self.filternameclassinstancegohere = ….;
}

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诗化ㄋ丶相逢 2024-12-25 01:42:46

虽然针对这个问题给出了很好的建议解决方案，但我发现我需要的是 NSClassFromString 方法。这是最终的实现：

- (void)filterSelected:(NSString *)filter
{
    //self.filternameclassinstancegohere = ….;
    self.myViewController = [[NSClassFromString(filter) alloc] initWithNibName:filter bundle:nil];

}

While there were good suggested solutions given for this question, I discovered what I needed is the NSClassFromString method. Here is a final implementation:

- (void)filterSelected:(NSString *)filter
{
    //self.filternameclassinstancegohere = ….;
    self.myViewController = [[NSClassFromString(filter) alloc] initWithNibName:filter bundle:nil];

}

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梦罢 2024-12-25 01:42:46

考虑使用一个带有字符串键的 NSMutableDictionary 实例变量，而不是 40 个实例变量。

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南薇 2024-12-25 01:42:46

您可以使用 NSSelectorFromString() 创建任意选择器：

SEL methodName = NSSelectorFromString(filter);
[self performSelector:methodName];

这将调用上面示例中的方法 colorFilter 。

在调用之前也最好检查一下 respondsToSelector。

You can create an arbitrary selector using NSSelectorFromString():

SEL methodName = NSSelectorFromString(filter);
[self performSelector:methodName];

This will call a method colorFilter in your example above.

Would be wise to check with respondsToSelector before calling, too.

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栀子花开つ 2024-12-25 01:42:46

如果过滤器值只能是少量、恒定数量的事物，则只需使用枚举和 switch 语句：

enum Filter
{
  ColorFilter,
  FooFilter,
  BarFilter
};

- (void)filterSelected:(Filter)filter
{
  switch(filter)
  {
  case ColorFilter:
    self.colorFilter = ...;
    break;
  case FooFilter:
    self.fooFilter = ...;
    break;
  case BarFilter:
    self.barFilter = ...;
    break;
  }
}

如果过滤器值集很大并且可能经常更改，那么您也可以使用键值编码。它更复杂但更灵活。

If the filter value can only be a small, constant number of things, just use an enumeration and a switch statement:

enum Filter
{
  ColorFilter,
  FooFilter,
  BarFilter
};

- (void)filterSelected:(Filter)filter
{
  switch(filter)
  {
  case ColorFilter:
    self.colorFilter = ...;
    break;
  case FooFilter:
    self.fooFilter = ...;
    break;
  case BarFilter:
    self.barFilter = ...;
    break;
  }
}

If the set of filter values is large and could change frequently, then you could also use Key-Value Coding. It's more complicated but more flexible.

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