ios - 以编程方式约束
<p><p>我在这个 View 上需要一点帮助。在实践中，我想减少绿色按钮的高度。我尝试以各种方式修复它，但要么使应用程序崩溃，要么它们无法正常工作。</p>
<p>谁能告诉我怎么解决？</p>
<p>有问题的 View 的屏幕截图:</p>
<p> <img src="/image/Lr2wKl.png" alt="View"/> </p>
<p>此时此处以编程方式。我必须降低高度的绿色部分称为“buttonShare”</p>
<pre><code>private extension DropPreviewView {
struct Constants {
static let regionSpan: CLLocationDistance = 250
static let cornerRadius: CGFloat = 10
static let headerHeight: CGFloat = 60
}
func setupUI() {
buttonShare.do {
$0.backgroundColor = .green
$0.addTarget(self, action: #selector(didTapOutsideView), for: .touchUpInside)
}
blurredBackgroundView.do {
$0.effect = UIBlurEffect(style: .dark)
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didTapOutsideView))
$0.addGestureRecognizer(tapGestureRecognizer)
}
spinner.do {
$0.hidesWhenStopped = true
$0.color = .darkGray
$0.startAnimating()
}
contentView.do {
$0.backgroundColor = .white
$0.clipsToBounds = true
$0.layer.cornerRadius = Constants.cornerRadius
}
dropPreviewImageView.do {
$0.contentMode = .scaleAspectFill
$0.clipsToBounds = true
$0.isUserInteractionEnabled = true
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didTapOnPreviewImage))
$0.addGestureRecognizer(tapGestureRecognizer)
}
}
func arrangeSubviews() {
addSubview(blurredBackgroundView, constraints: [
blurredBackgroundView.topAnchor.constraint(equalTo: topAnchor),
blurredBackgroundView.leftAnchor.constraint(equalTo: leftAnchor),
blurredBackgroundView.bottomAnchor.constraint(equalTo: bottomAnchor),
blurredBackgroundView.rightAnchor.constraint(equalTo: rightAnchor),
])
addSubview(contentView, constraints: [
contentView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: 0.8),
contentView.heightAnchor.constraint(equalTo: heightAnchor, multiplier: 0.7),
contentView.centerXAnchor.constraint(equalTo: centerXAnchor),
contentView.centerYAnchor.constraint(equalTo: centerYAnchor),
])
addSubview(buttonShare, constraints: [
buttonShare.centerXAnchor.constraint(equalTo: centerXAnchor)
])
header.addConstraint(
header.heightAnchor.constraint(equalToConstant: Constants.headerHeight)
)
let innerStack = UIStackView(arrangedSubviews: ).then {
$0.distribution = .fillEqually
$0.axis = .vertical
$0.spacing = 10
}
let stackView = UIStackView(arrangedSubviews: ).then {
$0.axis = .vertical
$0.distribution = .fill
$0.spacing = 10
}
contentView.addSubview(stackView, constraints: [
stackView.topAnchor.constraint(equalTo: contentView.layoutMarginsGuide.topAnchor),
stackView.leftAnchor.constraint(equalTo: contentView.layoutMarginsGuide.leftAnchor),
stackView.bottomAnchor.constraint(equalTo: contentView.layoutMarginsGuide.bottomAnchor),
stackView.rightAnchor.constraint(equalTo: contentView.layoutMarginsGuide.rightAnchor),
])
dropPreviewImageView.addSubview(spinner, constraints: [
spinner.centerXAnchor.constraint(equalTo: dropPreviewImageView.centerXAnchor),
spinner.centerYAnchor.constraint(equalTo: dropPreviewImageView.centerYAnchor),
])
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>试试:</p>
<pre><code> addSubview(buttonShare, constraints: [
buttonShare.centerXAnchor.constraint(equalTo: centerXAnchor)
buttonShare.heightAnchor.constraint(equalToConstant: 50).isActive = true
buttonShare.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: 12).isActive = true
])
</code></pre>
<p><strong>编辑:</strong>您需要将绿色 View 上方的 View 底部锚定到按钮顶部。确保这是在上面的代码之后</p></p>
<p style="font-size: 20px;">关于ios - 以编程方式约束，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/50525246/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/50525246/
</a>
</p>
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