Question

当我触摸subview以“屏蔽”应用的其余部分时，我添加searchBar。然后，当我触摸它时，我想删除此视图。但没有任何反应。有人可以向我解释一下吗？

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

你在做什么

[self.blackView removeFromSuperview];

哪个好。但是我没有看到你把它放在任何地方。在创建黑色视图后执行此操作。

[self setBlackView:blackView]

Answer 2

在函数searchBarShouldBeginEditin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

在界面中定义UIView * blackView，如下所示

@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

我的坏。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 功能中本地创建了“blackView”变量，该功能在 removeKeyboard 功能中无法访问。尝试使用上面声明的属性变量。

无法从超级视图中删除子视图

4 个答案: