我很遗憾给出静态图片,而不是gif图片,因此无法显示问题。
但我在下面提供了演示代码,因此您可以在xcode
。
import UIKit
class ViewController: UIViewController {
var circelWidth:CGFloat = 0.0
var circle_r_y:CGFloat = 316
let apear_circle_duration:CFTimeInterval = 1.5
let turn_ani_repeat_count:Float = 1 // times
let turn_ani_duration:Float = 0.4 // one circle, how many time, you can change the proerty to look more detail.
override func viewDidLoad() {
super.viewDidLoad()
initData()
initUI()
}
func initData() {
// 2.圆圈⭕️
if (Display.typeIsLike == .iphone6 || Display.typeIsLike == .iphone6plus) {
self.circelWidth = 260 // must set, then animate the circel
}else {
self.circelWidth = 230 // must set, then animate the circel
}
}
func initUI() {
self.view.backgroundColor = UIColor.brown
self.animateCircle()
}
func animateCircle() {
let r = CAReplicatorLayer()
r.bounds = CGRect.init(x: 0.0, y: 0.0, width: circelWidth, height: circelWidth)
r.cornerRadius = 10.0 // 10
r.backgroundColor = UIColor.clear.cgColor
// var circle_r_y:CGFloat = 160.0
circle_r_y = (UIScreen.main.bounds.size.height - 64) / 2.0 + 64
r.position = CGPoint.init(x: self.view.bounds.width / 2.0, y: circle_r_y)
//r.anchorPoint = CGPoint.init(x: 0.5, y: circle_r_y! / r.bounds.height) // 锚点设置
r.anchorPoint = CGPoint.init(x: 0.5, y: 0.5)
self.view.layer.addSublayer(r)
// dot
let dot = CALayer()
dot.bounds = CGRect(x:0.0, y :0.0, width:6.0, height:6.0)
dot.position = CGPoint(x:100.0, y:10.0)
dot.backgroundColor = UIColor(white:1, alpha:1.0).cgColor
dot.cornerRadius = 3.0 // half of dot width 一半
r.addSublayer(dot)
let nrDots: Int = 32
r.instanceCount = nrDots
let angle = CGFloat(2*M_PI) / CGFloat(nrDots)
r.instanceTransform = CATransform3DMakeRotation(angle, 0.1, 0.1, 1.0)
let shrink = CABasicAnimation(keyPath: "transform.scale")
shrink.fromValue = 1.0
shrink.toValue = 1.0 // 0.5
shrink.duration = apear_circle_duration
shrink.repeatCount = Float.infinity
dot.add(shrink, forKey: nil)
r.instanceDelay = apear_circle_duration/Double(nrDots)
dot.transform = CATransform3DMakeScale(0.1, 0.1, 0.1)
delay(delay: apear_circle_duration) {
let turn_key_path = "transform.rotation"
let turn_ani = CABasicAnimation.init(keyPath: turn_key_path)
turn_ani.isRemovedOnCompletion = false
turn_ani.fillMode = kCAFillModeForwards
turn_ani.toValue = M_PI*2
turn_ani.duration = CFTimeInterval(self.turn_ani_duration)
turn_ani.repeatCount = self.turn_ani_repeat_count
r.add(turn_ani, forKey: turn_key_path)
dot.transform = CATransform3DMakeScale(1, 1, 1) // 设置回来,不然再出现会放小
}
}
func delay(delay:Double, closure:@escaping ()->()){
let when = DispatchTime.now() + delay
DispatchQueue.main.asyncAfter(deadline: when, execute: closure)
}
}
Display.swift
,检查设备类型。
import UIKit
public enum DisplayType {
case unknown
case iphone4
case iphone5
case iphone6
case iphone6plus
static let iphone7 = iphone6
static let iphone7plus = iphone6plus
}
public final class Display {
class var width:CGFloat { return UIScreen.main.bounds.size.width }
class var height:CGFloat { return UIScreen.main.bounds.size.height }
class var maxLength:CGFloat { return max(width, height) }
class var minLength:CGFloat { return min(width, height) }
class var zoomed:Bool { return UIScreen.main.nativeScale >= UIScreen.main.scale }
class var retina:Bool { return UIScreen.main.scale >= 2.0 }
class var phone:Bool { return UIDevice.current.userInterfaceIdiom == .phone }
class var pad:Bool { return UIDevice.current.userInterfaceIdiom == .pad }
class var carplay:Bool { if #available(iOS 9.0, *) {
return UIDevice.current.userInterfaceIdiom == .carPlay
} else {
// Fallback on earlier versions
return false//UIDevice.current.userInterfaceIdiom == carplay
}
}
class var tv:Bool { if #available(iOS 9.0, *) {
return UIDevice.current.userInterfaceIdiom == .tv
} else {
// Fallback on earlier versions
return false
}
}
class var typeIsLike:DisplayType {
if phone && maxLength < 568 {
return .iphone4
}
else if phone && maxLength == 568 {
return .iphone5
}
else if phone && maxLength == 667 {
return .iphone6
}
else if phone && maxLength == 736 {
return .iphone6plus
}
return .unknown
}
}
问题
如果你在项目中测试这个,你可以找到问题,在动画时,有一点偏移,这是一个奇怪的问题,因为,我确保CAReplicatorLayer
的{{1}}是ahchorPoint
,但为什么会有偏差?
如果您想查看更多详细信息,可以更改(0.5, 0.5)
的值,您可以看到偏移量。
答案 0 :(得分:0)
可能为时已晚,但它是由您为旋转变换提供的矢量引起的:
更换
r.instanceTransform = CATransform3DMakeRotation(angle, 0.1, 0.1, 1.0)
通过
r.instanceTransform = CATransform3DMakeRotation(angle, 0, 0, 1.0)
那没关系。