如何以编程方式固定 UIImageView

Question

我阅读了文档，但我无法弄清楚在我的简单案例中到底需要什么。元素不断跳跃。我只需要那个。我将不胜感激文章等。为了更深入地了解这个

class MyViewController : UIViewController {
    override func loadView() {
    
        let view = UIView()
        view.backgroundColor = .white
        
        let imageView = UIImageView()
        
        view.addSubview(imageView)
       
        
        self.view = view
    }
}

Answer 1

您正在寻找自动布局约束。例如。添加到您的代码：

imageView.translatesAutoresizingMaskIntoConstraints = false

// add desired constraints here.
imageView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
...

您可能想要设置顶部、前导和尾随锚点，具体取决于所需的行为。

Answer 2

imageView.translatesAutoresizingMaskIntoConstraints = false

// Apply constraint

NSLayoutConstraint.activate([
    imageView.topAnchor.constraint(equalTo: view.topAnchor, constant: 10),
    imageView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10),
    imageView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -10),
    imageView.heightAnchor.constraint(equalTo: imageView.widthAnchor, multiplier: 1)
])

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