iphone - How to remove all buttons from a view in iOS 7?

Question

How can I remove all buttons from a view using iOS 7?

Here's code that works in earlier versions of iOS:

                for(UIView *view in cell.subviews){
                    if([view isMemberOfClass:[UIButton class]]){
                        [(UIButton *)view removeFromSuperview];
                    }
                }

Answer 1

首先，您需要从视图中获取所有子视图，然后检查所有视图是 UIButton 的类型。有关更多信息，请参阅此...

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

Answer 2

看起来您根本没有在子视图中循环。假设这是一个视图控制器：

NSArray * allSubviews = [self.view subviews];
for(UIView view in allSubviews)
{
    if([view isMemberOfClass:[UIButton class]])
    {                                     
        [view removeFromSuperview];                                 
    }
}

您也不需要在这里将“ view”转换为“ UIButton *”，因为“”的基类UIView是实现“ removeFromSuperview”的东西。

Answer 3

抱歉回复晚了。实际上，这部分代码在 iOS 6.0 之前都可以使用，但在 iOS 7.0 及更高版本中，该代码不起作用。

UIScrollview所以最后我找到了使用以下语句删除所有子视图的解决方案。

[scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)].

Answer 4

试试看，这会奏效

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