Swift如何更改背景颜色和按钮边框答案

【问题标题】：Swift how change the background color and button borderSwift如何更改背景颜色和按钮边框
【发布时间】：2018-11-03 11:16:49
【问题描述】：

我有功能：

func setSelectedSystemButtonColor(hoverButton: Int){
    let defaultColor = UIColor(red: 0/255, green: 62/255, blue: 132/255, alpha: 1)
    let selectedColor = UIColor(red: 251/255, green: 186/255, blue: 8/255, alpha: 1)

    homeBtn.backgroundColor = defaultColor
    productsBtn.backgroundColor = defaultColor
    calculatorBtn.backgroundColor = defaultColor
    conceptBtn.backgroundColor = defaultColor
    tipBtn.backgroundColor = defaultColor

    if hoverButton == 1 {
        homeBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 2 {
        productsBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 3 {
        calculatorBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 4 {
        conceptBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 5 {
        tipBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
}

此功能旨在： a) 将颜色重置为默认值， b) 设置所选按钮的背景颜色+添加边框。

颜色正确更改，但不显示边框。边框将在 5px 上

【问题讨论】：

参考此链接：stackoverflow.com/questions/28854469/… 和 stackoverflow.com/questions/28492740/…
你也必须设置borderWidth：button.layer.borderWidth = 5
重复stackoverflow.com/questions/8162411/…

标签： ios swift

【解决方案1】：

你忘了设置UIButton边框

button.layer.borderWidth = 0.8

【讨论】：

【解决方案2】：

你应该这样做：

  homeBtn.layer.borderWidth = 5
  homeBtn.layer.borderColor = defaultColor.cgColor

而不是简单地做：

  homeBtn.layer.borderColor = defaultColor.cgColor

【讨论】：

【解决方案3】：

为了显示按钮边框，首先你必须像这样明确地给homeBtn边框宽度：

homeBtn.layer.borderWidth = 5.0

那么只有你可以像这样为homeBtn边框层添加颜色：

homeBtn.layer.borderColor = defaultColor.cgColor

【讨论】：

【解决方案4】：

只替换这一行

let defaultColor = UIColor(red: 0.0/255.0, green: 62.0/255.0, blue: 132.0/255.0, alpha: 1)

与

let selectedColor = UIColor(red: 251.0/255.0, green: 186.0/255.0, blue: 8.0/255.0, alpha: 1)

【讨论】：

【解决方案5】：

您可能需要重置所有按钮的边框宽度。

func setSelectedSystemButtonColor(hoverButton: Int){
    let defaultColor = UIColor(red: 0/255, green: 62/255, blue: 132/255, alpha: 1)
    let selectedColor = UIColor(red: 251/255, green: 186/255, blue: 8/255, alpha: 1)

    homeBtn.backgroundColor = defaultColor
    productsBtn.backgroundColor = defaultColor
    calculatorBtn.backgroundColor = defaultColor
    conceptBtn.backgroundColor = defaultColor
    tipBtn.backgroundColor = defaultColor

    // reset border width of all buttons
    homeBtn.layer.borderWidth = 0.0
    productsBtn.layer.borderWidth = 0.0
    calculatorBtn.layer.borderWidth = 0.0
    conceptBtn.layer.borderWidth = 0.0
    tipBtn.layer.borderWidth = 0.0

    // set border width for selected button
    hoverButton.layer.borderWidth = 1.0

    if hoverButton == 1 {
        homeBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 2 {
        productsBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 3 {
        calculatorBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 4 {
        conceptBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
    if hoverButton == 5 {
        tipBtn.backgroundColor = selectedColor
        homeBtn.layer.borderColor = defaultColor.cgColor
    }
}

【讨论】：