iPhone scrollView使用ID动态添加元素 [英] iPhone scrollView add elements dynamically with id

问题描述

我想用很多不同的UI元素填充scrollView。
因此，我想我会写一种方法来记住滚动视图中的当前位置，然后将元素添加到当前位置的scrollView中。

I want to populate a scrollView with quite a few different UI elements. Therefore I thought I would write a method that remembers the current Position in the scrollView and just adds the element to the scrollView at the current Position.

类似：

- (void)addUIElement:(id)element withWidth:(CGFloat)width andHeight:(CGFloat)height andYGap:(CGFloat)YGap {

    element.frame = CGRectMake(currentScrollPos.x, (currentScrollPos.y + YGap), width, height);
    [scrolly addSubview:element];

    //And then set the current scroll position here
}

不幸的是，当我尝试访问element.frame = ...时，我收到的不是结构或联合的成员请求。当我尝试执行[元素框架] = ...左值作为赋值左操作数时。

Unfortunately when I try to do access element.frame = ..., I get request for member in something not a structure or union. When I try to do [element frame] = ... Lvalue required as left operand of assignment.

现在，首先我不确定什么是最好的方法动态地将对象添加到滚动视图。也许任何人都有更好或更轻松的方法。

Now, first of all I am not sure what's the best way to dynamically add objects to a scrollview. Maybe anyone has a better or easier approach.

那么，我不明白为什么上面的方法不起作用？！我是否需要将元素转换为实际的课程？我以为我不必这样做...而且我的方法也不再那么有意义了。或至少需要更多步骤...

Then on the other hand, I don't get why the above does not work?! Would I have to cast my element to the actual class? I thought I would not have to do so... Also then my method would not make that much sense anymore. Or at least would require some more steps...

推荐答案

我认为这应该可以工作：

This should work I think:

 [element setFrame:...];

但是，如果您在方法中使用不同的UI元素，则可以将元素参数设为UIView *而不是ID？这样，您的代码将适用于所有UIView子类（我想这是您实际上需要的）

However if you work with different UI elements in your method may be you can make your elements parameter UIView* instead of id? This way your code will work for all UIView subclasses (which is what you actually need I suppose)

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