我做了一个圆圈课,但我想把文字放在它的直接中心。
字体大小无关紧要,文字应始终显示在中心。
到目前为止,我只是尝试了任意值,直到它足够接近中心。必须有一个更简单的方法。
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")
}
}
答案 0 :(得分:3)
假设您的视图中有一个名为UILabel
的{{1}}属性;您可以使用label
方法将center
值设置为视图的中心位置:
layoutSubviews
请注意,使用override func layoutSubviews() {
super.layoutSubviews()
label.sizeToFit()
label.center = self.convertPoint(self.center, fromView: self.superview)
}
可以轻松实现这一点,但您无法像上面那样更改任何框架或中心:
Auto Layout