无法从其父视图中删除子视图

Question

当我触摸 searchBar 到 "mask" 应用程序的其余部分时，我添加了 subview。然后，我想在触摸它时删除它。但是没有任何反应。有人可以给我解释一下吗？

这是我的代码：

@property (nonatomic) UIView *blackView;

- (BOOL)searchBarShouldBeginEditing:(UISearchBar*)searchBar {
    NSLog(@"Touched in searchbar");
    UIView* blackView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    blackView.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];

    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(removeKeyboard:)];
    [self.view addGestureRecognizer:singleFingerTap];

    [self.view addSubview:blackView];

    return YES;
}

-(void)removeKeyboard:(UITapGestureRecognizer *)recognizer {
    [self.searchBar resignFirstResponder];
    [self.blackView removeFromSuperview];
}

谢谢。

Answer 1

你正在做

[self.blackView removeFromSuperview];

很好。但我没有看到你在任何地方设置它。在创建黑色视图后执行此操作。

[self setBlackView:blackView]

Answer 2

在函数 searchBarShouldBeginEdit 中创建新变量 backView：

UIView* blackView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

在这种情况下 self.blackView 不是这个 UIView

像这样在界面中定义UIView *blackView

@iterface Controller {
     UIView *blackView;
}

然后创建黑色视图：

- (BOOL)searchBarShouldBeginEditing:(UISearchBar*)searchBar {
    blackView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    blackView.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];

    ....
    return YES;
}

现在删除它：

-(void)removeKeyboard:(UITapGestureRecognizer *)recognizer {
    ...

    [blackView removeFromSuperview];
}

Answer 3

我的错。我创建了一个新变量，而不是使用界面中的变量。这里是干净的代码。

@property (nonatomic) UIView *blackView;

- (BOOL)searchBarShouldBeginEditing:(UISearchBar*)searchBar {
    NSLog(@"Touched in searchbar");
    self.blackView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.blackView.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];

    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(removeKeyboard:)];
    [self.blackview addGestureRecognizer:singleFingerTap];

    [self.view addSubview:self.blackView];

    return YES;
}

-(void)removeKeyboard:(UITapGestureRecognizer *)recognizer {
    [self.searchBar resignFirstResponder];
    [self.blackView removeFromSuperview];
}

Answer 4

您在 searchBarShouldBeginEditing 函数中本地创建了 'blackView' 变量，在 removeKeyboard 函数中无法访问该变量。尝试使用您在上面声明的属性变量。

无法从其父视图中删除子视图

Can't remove a subview from its superview

objective-c

uiview

ios