Question

这是在我的viewController

中

import UIKit
import SnapKit

class ViewController: UIViewController {



var numberInCircleView: NumberInCircleView!

override func viewDidLoad() {
    super.viewDidLoad()

}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    self.setupViews()
}

func setupViews() {

    self.numberInCircleView = NumberInCircleView(frame: .zero)
    self.view.addSubview(self.numberInCircleView)
    self.numberInCircleView.snp.makeConstraints { (make) in

        make.leading.equalTo(20)
        make.bottom.equalTo(-40)
        make.width.equalTo(60)
        make.height.equalTo(60)
    }
    self.numberInCircleView.numberLabel = 5
}

}

以下是我的自定义类。

import Foundation
import UIKit

class NumberInCircleView: UIView {



 var numberLabel: UILabel!




override init(frame: CGRect) {
    super.init(frame: frame)

    self.setupViews()
}

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

    self.setupViews()
}


func setupViews() {


    self.numberLabel = UILabel(frame: .zero)
    self.addSubview(self.numberLabel)
    self.numberLabel.snp.makeConstraints { (make) in
        make.edges.equalToSuperview()
    }

    self.layer.cornerRadius = 30
    self.backgroundColor = UIColor.red
    self.layer.borderWidth = 1
    self.layer.borderColor = UIColor.black.cgColor
    self.numberLabel.text = ""
    self.numberLabel.textAlignment = .center
    self.numberLabel.textColor = UIColor.white
    self.numberLabel.adjustsFontSizeToFitWidth = true
    self.numberLabel.minimumScaleFactor = 0.5
}

我的ViewController中的这一行

    self.numberInCircleView.numberLabel = 5

应将标签设置为5.我不确定如何在视图之间调用来执行此操作？您能否提一些建议？一些在线教程为我提供了更多关于此的信息，我们也非常感激。

Answer 1

似乎您想要将值5设置为标签但是在这里您缺少正确的语法，numberLabel是UILabel实例并且具有类型的属性text String如果要将文本设置为标签，则必须分配一些字符串，如下所示：

self.numberInCircleView.numberLabel.text = "5"

Answer 2

I'm not sure how I call between views to do this 你可以在任何对象上调用任何方法，直到你引用它为止。

self.numberInCircleView.numberLabel = 5这是编译时错误，因为您无法为＆＃34; UILabel＆＃34;

的类型分配5

替换 self.numberInCircleView.numberLabel = 5

与

self.numberInCircleView.numberLabel.text = "5"

努力在自定义类和视图控制器之间的标签中显示数据

2 个答案: