iOS，带有 Collection View 的自定义键盘，约束问题
<p><p>我正在尝试为 iOS 创建一个自定义键盘，其中包括带有图像的 Collection View 。目前我正在尝试没有 Storyboard ( Storyboard 有几个问题，很难描述)。所以我只是添加“nextKeyboardButton”(在 XCode 上添加新目标时默认出现)，然后添加另一个按钮(切换 <code>UICollectionViewCell</code> 上的图标类型，最后是 <code>UICollectionView</code>.</p>
<p>我的代码:</p>
<pre><code>class KeyboardViewController: UIInputViewController, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
@IBOutlet var nextKeyboardButton: UIButton!
@IBOutlet var switchTypedButton: UIButton!
var isEmoji: Bool! = true;
var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Collection View
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.scrollDirection = UICollectionViewScrollDirection.horizontal
layout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 30, right: 10)
layout.itemSize = CGSize(width: 50, height: 50)
collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
collectionView.dataSource = self
collectionView.delegate = self
collectionView.register(IconViewCell.self, forCellWithReuseIdentifier: "Cell")
collectionView.backgroundColor = UIColor.white
collectionView.showsHorizontalScrollIndicator = false
self.view.addSubview(collectionView)
// Perform custom UI setup here
self.nextKeyboardButton = UIButton(type: .system)
self.nextKeyboardButton.setTitle(NSLocalizedString("ABC", comment: "Title for 'Next Keyboard' button"), for: [])
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
self.nextKeyboardButton.addTarget(self, action: #selector(handleInputModeList(from:with:)), for: .allTouchEvents)
self.view.addSubview(self.nextKeyboardButton)
// Perform custom UI setup here
self.switchTypedButton = UIButton(type: .system)
self.switchTypedButton.setTitle("View Gifs", for: [])
self.switchTypedButton.sizeToFit()
self.switchTypedButton.translatesAutoresizingMaskIntoConstraints = false
self.switchTypedButton.addTarget(self, action: #selector(self.switchTypedFunction), for: .touchUpInside)
self.view.addSubview(self.switchTypedButton)
self.nextKeyboardButton.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 10).isActive = true
self.nextKeyboardButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
self.switchTypedButton.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -10).isActive = true
self.switchTypedButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
self.collectionView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
self.collectionView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
self.collectionView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
self.collectionView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
}
}
</code></pre>
<p>我得到的错误是:</p>
<pre><code>Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x174097c00 h=--& v=--& UICollectionView:0x11000aa00.height == 0 (active)>",
"<NSLayoutConstraint:0x174097430 V:|-(0)- (active, names: '|':UIInputView:0x10fe00990 )>",
"<NSLayoutConstraint:0x1740974d0 UICollectionView:0x11000aa00.bottom == UIInputView:0x10fe00990.bottom (active)>",<<<<<<<------- ERROR
"<NSLayoutConstraint:0x174097930 'UIView-Encapsulated-Layout-Height' UIInputView:0x10fe00990.height == 667 (active)>"
)
</code></pre>
<p>所以我可以看到错误可能出现在 <code>UICollectionView:0x11000aa00.bottom == UIInputView:0x10fe00990.bottom</code> 但我不明白为什么这是错误的并且它导致它失败。</p >
<p>附言。在模拟器中可以找到，但在 iPhone 6S 中却没有。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>在将 collectionView 作为 subview 添加到 View 之前添加此行:</p>
<p><code>
collectionView.translatesAutoresizingMaskIntoConstraints = false
</code>
这样自动调整大小的约束就被删除了</p>
<p>和 addSubview 之后的这一行:
<code>
self.view.addConstraint(NSLayoutConstraint(项目:self.collectionView，属性:.height，relatedBy:.equal，toItem:self.view，属性:.height，乘数:1.0，常数:0.0))
</code></p>
<p>以便指定 Collection View 的高度。否则它将折叠到零高度。</p></p>
<p style="font-size: 20px;">关于iOS，带有 Collection View 的自定义键盘，约束问题，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40113114/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40113114/
</a>
</p>
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