Swift 3:将UIButton扩展添加到ViewController

Posted

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Swift 3:将UIButton扩展添加到ViewController相关的知识,希望对你有一定的参考价值。

我是ios / Swift的初学者,试图创建一个没有Storyboard的简单应用程序。我创建了一个UIButton扩展,我想在我的视图中添加一个简单的按钮(稍后将设置约束)。不幸的是,按钮不可见。如果有人帮助我,我将不胜感激。谢谢!

--- Buttons.swift ---

extension UIButton {

func createRectangleButton(buttonPositionX: Double, buttonPositionY: Double ,buttonWidth: Double, buttonHeight: Double, buttonTilte: String) {
    let button = UIButton(type: .system) as UIButton
    button.frame = CGRect(x: buttonPositionX, y: buttonPositionY, width: buttonWidth, height: buttonHeight)
    button.setTitle(buttonTilte, for: .normal)
    button.backgroundColor = COLOR_WHITE
    button.tintColor = COLOR_BLACK
    }   
}

--- InitialViewController.swift ---

import UIKit 

class InitialViewController: BaseViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    // Gradient Layer
    view.addGradientBackground(colorTop: COLOR_ROYALRED2, colorBottom: COLOR_ROYALRED1)

    // Button
    let startButton = UIButton()
    startButton.createRectangleButton(buttonPositionX: 50, buttonPositionY: 20, buttonWidth: 200, buttonHeight: 50, buttonTilte: "START")
    self.view.addSubview(startButton)

    }
}
答案

试试如下:

在此处输入代码

extension UIButton {

func createRectangleButton(buttonPositionX: Double, buttonPositionY: Double ,buttonWidth: Double, buttonHeight: Double, buttonTilte: String) {
                let button = self // changes made here
                button.frame = CGRect(x: buttonPositionX, y: buttonPositionY, width: buttonWidth, height: buttonHeight)
                button.setTitle(buttonTilte, for: .normal)
                button.backgroundColor = COLOR_WHITE
                button.tintColor = COLOR_BLACK
            }

以上是关于Swift 3:将UIButton扩展添加到ViewController的主要内容,如果未能解决你的问题,请参考以下文章

如何从 HTTP 请求将图像加载到 UIButton Swift

如何将 UIButton 添加到 Swift Playground?

Swift - 将目标添加到子视图内的 UIButton

将 UIButton 添加到工具栏 swift 5

如何从HTTP请求将图像加载到UIButton Swift中

如何从 Swift 的扩展中排除特定的 UIButton?