Ios Can'；t更改以编程方式创建的UILabel中的文本大小

我无法更改以编程方式创建的

UILabel

中文本的大小

以下是屏幕抓图：

下面是类定义：

class myView: UIView {
    let theLabel = UILabel()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.theLabel.text = "Text"
        self.theLabel.backgroundColor = UIColor.lightGray
        self.backgroundColor = UIColor.blue

        self.theLabel.adjustsFontSizeToFitWidth = true
        self.theLabel.textAlignment = .center
        self.theLabel.numberOfLines = 1
        self.theLabel.minimumScaleFactor = 0.1
        self.theLabel.font = UIFont( name: "System", size:160)
        self.theLabel.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(self.theLabel)

        let selfAspectConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 1.0, constant: 0)

        let labelWidthConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

        let heightConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self.theLabel, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

        let xConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)

        let yConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)

        self.addConstraints([selfAspectConstraint,labelWidthConstraint, heightConstraint,xConstraint,yConstraint])
    }
    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */
}

我试过改变字体大小。我已将

adjustsFontSizeToFitWidth

设置为true，并将

minimumScaleFactor

设置为true。文本大小始终相同。我希望它能填充标签区域，即灰色框

---

如何使其工作？

设置字体后，尝试添加此行：

---

self.theLabel.font=theLabel.font.with size（45）

您的代码按预期工作，没有任何更改。

CustomView1NoXIB.swift

CustomView1ViewController.swift

谢谢，

---

Sriram

，如何创建

myView

？我认为@aircraft询问的原因是因为您已经在init（coder:）中对所有内容进行了编码，而不是在init（frame:）中。在IB中，我添加了一个UIView并将类设置为myView尝试将代码移动到viewDidLoad方法。它在这里工作正常吗？@Avt，他向我们展示的唯一代码是UIView子类，它没有viewDidLoad，但它的视图控制器有。这确实有效！谢谢为什么我需要显式设置字体大小？我在指定字体时设置了大小。可能没有名为“系统”的字体。还有tryself.theLabel.font=UIFont.systemFont（of size:80）这很愚蠢，而且完全是胡扯——但这是iOS 10允许我在从代码创建

UILabel

实例时使用微小字体（例如

9

）的唯一方法！发疯了……谢谢你的回复。我试图把文本放大，以填充框架。大卫·林赛的答案是有效的，尽管我不知道为什么。

import UIKit
class CustomView1NoXIB : UIView {
  let theLabel = UILabel()

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    initSubviews()
  }




  func initSubviews() {
    self.theLabel.text = "Hello"
//    self.theLabel.text = "Hello World Big Text Becomes Small"
    self.theLabel.backgroundColor = UIColor.lightGray
    self.backgroundColor = UIColor.blue

    self.theLabel.adjustsFontSizeToFitWidth = true
    self.theLabel.textAlignment = .center
    self.theLabel.numberOfLines = 1
    self.theLabel.minimumScaleFactor = 0.1
    self.theLabel.font = UIFont( name: "System", size:160)
    self.theLabel.translatesAutoresizingMaskIntoConstraints = false
    self.addSubview(self.theLabel)

    let selfAspectConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 1.0, constant: 0)

    let labelWidthConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

    let heightConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self.theLabel, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)

    let xConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)

    let yConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)

    self.addConstraints([selfAspectConstraint,labelWidthConstraint, heightConstraint,xConstraint,yConstraint])

  }
}

import UIKit
class CustomView1ViewController : UIViewController {
  @IBOutlet weak var customView1: CustomView1!
  @IBOutlet weak var customView1NoXIB: CustomView1NoXIB!

  override func viewDidLoad() {
    super.viewDidLoad()
  }
}