问题描述
如何使我的按钮可扩展？以编程方式，使用矢量或其他东西？它只是一个带三线的典型导航图标。有没有一种简单的方法可以在不使用图像的情况下创建清晰，可扩展的图标？
How can I make my button scalable? Programmatically, using vector or something else? It is just a typical navigation icon with triple lines. Is there a simple way to create crisp, scalable icon without using images?
推荐答案
是的，您可以使用Core Graphics创建图标。请按照以下简单的4个步骤绘制3条按钮图标。
Yes you can create the icons using Core Graphics. Please follow these simple 4 steps to draw 3 bar button icon.
1）将 UIButton 添加到故事板和地方它。
1) Add UIButton to your storyboard and place it.
2）创建基类UIButton名称的Cocoa类，就像'NavButton'
和粘贴以下代码
2) Create Cocoa Class of base class UIButton name it like 'NavButton' and paste following code
import UIKit
class NavButton: UIButton {
override func drawRect(rect: CGRect) {
// thickness of your line
let lineThick:CGFloat = 1.0
// length of your line relative to your button
let lineLenght:CGFloat = min(bounds.width, bounds.height) * 0.8
// color of your line
let lineColor: UIColor = UIColor.whiteColor()
// this will add small padding from button border to your first line and other lines
let marginGap: CGFloat = 5.0
// we need three line
for line in 0...2 {
// create path
let linePath = UIBezierPath()
linePath.lineWidth = lineThick
//start point of line
linePath.moveToPoint(CGPoint(
x: bounds.width/2 - lineLenght/2,
y: 6.0 * CGFloat(line) + marginGap
))
//end point of line
linePath.addLineToPoint(CGPoint(
x: bounds.width/2 + lineLenght/2,
y: 6.0 * CGFloat(line) + marginGap
))
//set line color
lineColor.setStroke()
//draw the line
linePath.stroke()
}
}
}
3）将 NavButton 类分配给 UIButton 来自Identity Inspector>自定义类>类字段
3) Assing NavButton class to your UIButton from Identity Inspector > Custom Class > Class field
4）从属性检查器>默认标题（第四个）中删除按钮的默认标题
4) Remove default title of your button from Attribute Inspector > Default Title (fourth one)
完成，现在构建并运行您可以看到带有条形的按钮
Done, Now build and run you can see your button with bars
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