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从视图中删除按钮

发布于 2024-10-10 08:24:24 字数 137 浏览 0 评论 0原文

有没有办法清除所有按钮的视图？我的代码每秒都会生成按钮，并且我制作了一个按钮，我想将它们全部从屏幕上清除。当我尝试 [brick.removeFromSuperview] （brick 是按钮的名称）时，它只删除了生成的最后一个按钮。

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稍尽春風 2024-10-17 08:24:24

您可以在 NSMutableArray 中跟踪对所有按钮的引用。

NSMutableArray *buttons = [[NSMutableArray alloc] init];

// Button creation
UIButton *button = [[UIButton alloc] init...];
[yourView addSubview:button];
[buttons addObject:button];
[button release];

// Button removal
[buttons makeObjectsPerformSelector:@selector(removeFromSuperview)];
[buttons removeAllObjects];  // Alternatively, you could omit this line
                             // and recycle the buttons at a later time

此方法的一个优点（与仅枚举视图的子视图并查找按钮相反）是，您不必担心从视图中删除不应删除的 UIButton。例如，如果您不希望删除“删除所有按钮”按钮，则不要将其添加到数组中。

You could keep track of the references to all your buttons in an NSMutableArray.

e.x.

NSMutableArray *buttons = [[NSMutableArray alloc] init];

// Button creation
UIButton *button = [[UIButton alloc] init...];
[yourView addSubview:button];
[buttons addObject:button];
[button release];

// Button removal
[buttons makeObjectsPerformSelector:@selector(removeFromSuperview)];
[buttons removeAllObjects];  // Alternatively, you could omit this line
                             // and recycle the buttons at a later time

An advantage of this method (as opposed to just enumerating the view's subviews and looking for buttons) is that you don't have to worry about removing UIButtons from your view that shouldn't be. For example, if you don't want your "delete all buttons" button removed, just don't add it to the array.

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撩起发的微风 2024-10-17 08:24:24

for (UIView *view in [self subviews]) {
    if ([view isKindOfClass:[UIButton class]]) {
        [view removeFromSuperview];
    }
}

但要小心，这实际上会删除指定视图中的所有按钮。因此，您可能需要某种条件来仅删除生成的按钮。您可以通过在其他按钮上设置标签来区分生成的按钮，如果该按钮没有标签，则将其删除。

for (UIView *view in [self subviews]) {
    if ([view isKindOfClass:[UIButton class]]) {
        [view removeFromSuperview];
    }
}

Careful though, this will literally delete all buttons from the specified view. So you probably want some kind of conditional to only delete the generated buttons. You could distinguish from generated buttons by setting a tag on your other buttons, if the button has no tag then remove it.

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差↓一点笑了 2024-10-17 08:24:24

NSMutableArray * buttons = [[NSMutableArray alloc] init];

for( NSObject * btn in btn.superview.subviews )
{
  if( [btn isKindOfClass: [UIButton class]] )
    [buttons addObject: btn]; 
}

for( UIView * btn in buttons )
  [btn removeFromSuperview];

[buttons release];

需要临时数组，因为删除按钮会使枚举器失效，从而产生不可预测的结果。

NSMutableArray * buttons = [[NSMutableArray alloc] init];

for( NSObject * btn in btn.superview.subviews )
{
  if( [btn isKindOfClass: [UIButton class]] )
    [buttons addObject: btn]; 
}

for( UIView * btn in buttons )
  [btn removeFromSuperview];

[buttons release];

The temporary array is required because removing the button invalidates the enumerator producing unpredictable results.

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