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ios - 如何将文本居中放置在圆圈中间?

转载 作者:搜寻专家 更新时间:2023-10-31 19:30:45 27 4
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我制作了一个圆形类,但我想将文本放在它的正中央。

字体大小无关紧要,文本应始终显示在中间。

到目前为止,我只是简单地尝试了任意值,直到它离中心足够近为止。必须有更简单的方法。

import UIKit


class CircleView: UIView {
let circleLayer: CAShapeLayer = CAShapeLayer()

init(frame: CGRect, innerColor: CGColor = Colors.colorWithHexString("#858585").CGColor, rimColor: CGColor = UIColor.blueColor().CGColor) {
super.init(frame: frame)
self.backgroundColor = UIColor.clearColor()
let circlePath = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: (frame.size.width - 10)/2, startAngle: 0.0, endAngle: CGFloat(M_PI * 2.0), clockwise: true)

// Setup the CAShapeLayer
circleLayer.path = circlePath.CGPath
circleLayer.fillColor = innerColor
circleLayer.strokeColor = rimColor
circleLayer.lineWidth = 5.0

// Don't draw the circle at start
circleLayer.strokeEnd = 1.0
layer.addSublayer(circleLayer)
}

func animateCircle(duration: NSTimeInterval) {
let animation = CABasicAnimation(keyPath: "strokeEnd")

animation.duration = duration

animation.fromValue = 0
animation.toValue = 1

// Do a linear animation
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)

circleLayer.strokeEnd = 1.0

// Do the actual animation
circleLayer.addAnimation(animation, forKey: "animateCircle")
}

required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

最佳答案

假设您的 View 中有一个名为 labelUILabel 属性;您可以在 layoutSubviews 方法中将 center 值设置为 View 的中心:

override func layoutSubviews() {
super.layoutSubviews()

label.sizeToFit()
label.center = self.convertPoint(self.center, fromView: self.superview)
}

请注意,使用 Auto Layout 会容易得多,但您无法像上面那样更改任何框架或中心:

self.addConstraint(NSLayoutConstraint(
item: label,
attribute: NSLayoutAttribute.CenterX,
relatedBy: NSLayoutRelation.Equal,
toItem: self,
attribute: NSLayoutAttribute.CenterX,
multiplier: 1.0, constant: 0.0))

self.addConstraint(NSLayoutConstraint(
item: label,
attribute: NSLayoutAttribute.CenterY,
relatedBy: NSLayoutRelation.Equal,
toItem: self,
attribute: NSLayoutAttribute.CenterY,
multiplier: 1.0, constant: 0.0))

关于ios - 如何将文本居中放置在圆圈中间?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31971092/

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