如何使用自定义子视图更新或重置 UIView？
我在 UIViewController 中有一个 UIView，我在 viewDidAppear 方法中添加了一个自定义子视图。
MyView *myView = [[MyView alloc] initWithLabelText:text];
[self.view addSubview:myView];
[myView release];
text 变量是在 myView 中的标签上使用的字符串。每次您返回当前视图时，此文本都会发生变化。但似乎 viewDidAppear 不会重新加载视图 - 它而是在旧视图上加载新视图 - 所以我有两个相互重叠的标签。
我尝试使用 viewWillAppear 但没有任何区别。我还尝试使用 [self.view setNeedsDisplay] - 没有帮助。我还尝试将 myView 设为实例变量，但也没有帮助。
当我将视图声明为实例变量时，有效的方法是显式删除视图：
- (void)viewDidDisappear:(BOOL)animated
{
[_myView removeFromSuperview];
}
尽管有此解决方法，但我想在返回视图时简单地重置视图。有人知道该怎么做吗？我将不胜感激;)
I have a UIView in a UIViewController to which I add a custom subview in the viewDidAppear method.
MyView *myView = [[MyView alloc] initWithLabelText:text];
[self.view addSubview:myView];
[myView release];
The text variable is a string used on a label in myView. This text changes every time you come back to the current view. But it seems that viewDidAppear does not reload the view - it rather loads a new view over the old one - so I have two labels over each other.
I tried to use viewWillAppear but it doesn't make any difference. I also tried to use [self.view setNeedsDisplay] - doesn't help. I also tried to make myView an instance variable, but it also didn't help.
What worked was to remove the view explicitly, when I declared it as an instance variable:
- (void)viewDidDisappear:(BOOL)animated
{
[_myView removeFromSuperview];
}
Although there is this workaround I would like to simply reset the view when getting back to it. Does anybody know how to do that? I would appreciate it ;)
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不要每次都分配和初始化自定义子视图，仅在第一次调用 viewDidAppear 时才分配和初始化。然后将其保留在财产中以供后续使用。
Don't alloc and init the custom subview every time, only the first time viewDidAppear is called. Then retain it in a property for subsequent use.
可以考虑以下事情。
viewDidLoad -->分配并初始化您的子视图
viewDidAppear -->更新子视图
解除分配-->释放子视图。
The followings thing can ben considered.
viewDidLoad --> alloc and init your sub views
viewDidAppear --> update sub views
dealloc --> release sub views.