未收到 UIButton TouchDown 事件

发布于 2024-09-16 00:46:46 字数 879 浏览 2 评论 0原文

我正在以编程方式为我的应用程序创建一个 UIButton。我在网上找到的几个例子看起来很简单。按照这些示例，我可以很好地创建一个按钮，但它无法执行我为其连接的 TouchDown 事件的操作。这是父视图的 ViewDidLoad 内按钮的代码：

        _searchButton = UIButton.FromType(UIButtonType.RoundedRect);
        _searchButton.Frame = new RectangleF(swidth / 2 - 50f, 140f, 100f, 40f);
        //_searchButton.BackgroundColor = UIColor.Clear;
        _searchButton.SetTitle("Search", UIControlState.Normal);
        _searchButton.SetTitleColor(UIColor.Black, UIControlState.Normal);
        _searchButton.UserInteractionEnabled = true;
        _searchButton.TouchDown += delegate
        {
            Console.WriteLine("wicked");
        };
        this.View.AddSubview(_searchButton);

我唯一能想到的可能是 UserInteractionEnabled 的设置。但它们似乎默认设置为 true。（明确地将按钮设置为 true 没有帮助。）

我在这里可能做错了什么？

我应该补充一点，当我点击按钮时，即使没有为 TouchDown 连接任何东西，该按钮也应该变成蓝色？那也不会发生。

原文

I'm programmatically creating a UIButton for my app. The few examples I've found online seem straightforward. Following the examples, I can create a button fine but it fails to do the action for TouchDown event I have wired for it. Here is the code for the button inside the ViewDidLoad of the parent view:

        _searchButton = UIButton.FromType(UIButtonType.RoundedRect);
        _searchButton.Frame = new RectangleF(swidth / 2 - 50f, 140f, 100f, 40f);
        //_searchButton.BackgroundColor = UIColor.Clear;
        _searchButton.SetTitle("Search", UIControlState.Normal);
        _searchButton.SetTitleColor(UIColor.Black, UIControlState.Normal);
        _searchButton.UserInteractionEnabled = true;
        _searchButton.TouchDown += delegate
        {
            Console.WriteLine("wicked");
        };
        this.View.AddSubview(_searchButton);

The only thing I can think of possibly the setting of UserInteractionEnabled. But they seem to be set to true by default. (Explicitly setting it true for the button doesn't help.)

What could I be doing wrong here?

I should add that the button should turn blue when I click on it, even if nothing is wired for TouchDown? That doesn't happen either.

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原谅过去的我 2024-09-23 00:46:46

更多上下文然后答案。搜索按钮有一个文本字段同级，两者都由容器 UIViewController 保存。该父容器是 TableViewController 的同级容器。 uivc和tvc都由一个外容器来容纳。

我的代码位于

View.AddSubview(uivc);
View.AddSubview(tvc);

最外面的容器中。

表工作正常，uivc 控件则不行。如果我颠倒顺序，两者都可以正常工作！

View.AddSubview(tvc);
View.AddSubview(uivc);

去算算吧。

More context then the answer. The search button has a textfield sibling, both held by a container UIViewController. That parent container is a sibling of a TableViewController. Both the uivc and the tvc are held by an outer container.

My code was

View.AddSubview(uivc);
View.AddSubview(tvc);

in the outermost container.

Table works fine, uivc controls do not. If I reverse the order, both work fine!

View.AddSubview(tvc);
View.AddSubview(uivc);

Go figure.

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若言繁花未落 2024-09-23 00:46:46

处理 TouchDown 事件的方法是使用目标操作方法。下面是一个示例：

// button action method declaration
UIButton *buttonTemp = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[buttonTemp addTarget:self action:@selector(favoriteTapped:event:) 

//method to fire when the button is touched

- (void)favoriteTapped:(id)sender event:(id)event
{
    NSLog(@"favoriteTapped");
}

简而言之，按钮声明中的第二行表示：“触摸按钮时，触发‘favoriteTapped 方法’

The way to handle a TouchDown event is to use a target-action method. Here is an example:

// button action method declaration
UIButton *buttonTemp = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[buttonTemp addTarget:self action:@selector(favoriteTapped:event:) 

//method to fire when the button is touched

- (void)favoriteTapped:(id)sender event:(id)event
{
    NSLog(@"favoriteTapped");
}

In a nutshell, the second line in the button declaration says: "When the button is touched, fire the 'favoriteTapped method'

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