ios - 选择一个按钮后，如何取消选择数组中的所有其他按钮？
<p><p>目前，当我在数组中选择一个按钮时，它会从灰色变为黑色，如果再次选择，它会变回灰色，这是我想要的。问题是当我选择一个按钮并选择另一个按钮时，它们都是黑色的。我怎样才能使当我选择一个按钮，然后选择另一个按钮时，前一个按钮会变回灰色？</p>
<pre><code>let subjectArray = ["Button1", "Button2", "Button3", "Button4"]
for title in subjectArrary {
let button = UIButton()
button.backgroundColor = UIColor.white
button.setTitle("\(title)", for: .normal)
button.setTitleColor(UIColor.gray, for: .normal)
button.heightAnchor.constraint(equalToConstant: 60).isActive = true
button.widthAnchor.constraint(equalToConstant: 140).isActive = true
button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)
stack.addArrangedSubview(button)
}
func buttonPressed(sender:AnyObject) {
guard let button = sender as? UIButton else { return }
if !button.isSelected {
button.isSelected = true
button.setTitleColor(UIColor.black, for: .normal)
} else {
button.isSelected = false
button.setTitleColor(UIColor.gray, for: .normal)
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><pre><code>// Create an array of buttons which will hold all of your buttons
// This is a class property, we can already initialise this with empty array so we don't need to set it during class init()
let buttons: = []
func createButton(withTitle title: String) -> UIButton {
let button = UIButton()
button.setTitle(title, for: .normal)
button.setTitleColor(.gray, for: .normal)
button.setTitleColor(.black, for: .selected) // Please take note I've added this line
button.backgroundColor = .white
button.widthAnchor.constraint(equalToConstant: 140).isActive = true
button.heightAnchor.constraint(equalToConstant: 60).isActive = true
button.addTarget(self, action: #selector(didTapButton(_:)), for: .touchUpInside)
return button
}
func setupButtons() {
let subjectArray = ["Button1", "Button2", "Button3", "Button4"]
for title in subjectArrary {
let button = createButton(withTitle: title)
buttons.append(button) // Append all your buttons
stack.addArrangedSubview(button)
}
}
func didTapButton(_ button: UIButton) {
deselectAllButtons()
button.isSelected = !button.isSelected // set/unset of button state happens here
}
func deselectAllButtons() {
buttons.forEach { $0.isSelected = false }
}
</code></pre>
<p>当你的按钮被选中时，这条线会为你的按钮设置黑色标题颜色..</p>
<pre><code>button.setTitleColor(.black, for: .selected)
</code></pre>
<p>为了更简洁的代码，我在你的 for 循环中提取了代码，制作了一小块方法..
此外，无需将我的代码注释添加到您的实际代码中；)</p></p>
<p style="font-size: 20px;">关于ios - 选择一个按钮后，如何取消选择数组中的所有其他按钮？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/46481673/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/46481673/
</a>
</p>
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