如何通过设置frame属性来移动或调整NSView的大小? [英] How to move or resize an NSView by setting the frame property?

问题描述

我在情节提要中创建了NSView.在这种情况下，它是NSTextField.在NSViewController的viewDidLoad()方法中，我想有条件地调整NSTextField的大小和位置，但是设置框架没有效果.

I created the NSView in a storyboard. In this case, it is an NSTextField. In the NSViewController's viewDidLoad() method, I want to conditionally resize and reposition the NSTextField, but setting the frame has no effect.

例如:

class ViewController: NSViewController {

    @IBOutlet var label: NSTextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        label.frame = NSRect(x: 0, y: 0, width: 200, height: 17)
        label.setNeedsDisplay()
    }
}

加载视图时，标签仍然具有其在界面构建器中设置的原始框架，而不是新设置的框架.

When the view loads, the label still has its original frame as set in interface builder, and not the newly set frame.

一个人如何以编程方式移动/调整标签大小?

How does one programmatically move/resize the label?

推荐答案

自动布局系统是这里的罪魁祸首.设置框架时，自动布局系统会覆盖该框架，以重新建立情节提要中设置的隐式约束.

The autolayout system is the culprit here. When you set the frame, the autolayout system overrides that to re-establish the implicit constraints set in the storyboard.

将标签的translatesAutoresizingMaskIntoConstraints属性设置为true.这告诉自动布局系统应创建一个 new 套自动布局约束，这些约束应满足您设置的新框架:

Set the translatesAutoresizingMaskIntoConstraints property of the label to true. This tells the autolayout system that it should create a new set of autolayout constraints that satisfy the new frame you've set:

class ViewController: NSViewController {

    @IBOutlet var label: NSTextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        label.frame = NSRect(x: 0, y: 0, width: 200, height: 17)
        label.translatesAutoresizingMaskIntoConstraints = true
        label.setNeedsDisplay()
    }
}

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