我想根据iPhone的滚动/俯仰/偏航以3D为中心围绕其中心点旋转图像。
哪个是首选解决方案：CGAffineTransform或CATransform3D？
有没有我可以效法的例子。有很多帖子暗示解决方案。
为简单起见，该图像是矩形。
非常感谢。
答案 0 :(得分：0)
CoreMotion给出设备当前的姿态（以偏航，俯仰，滚动，欧拉模式或四元数旋转）。这是表达同一件事的3种不同方式。 您需要做的是正确应用转换以反映设备当前的状态。 考虑这个示例。
chr()要重现，有必要在情节提要中创建UIView（Let vRequestBody = vRequestBody&'{"troup":"CB","tt":"CBA","tk":"' & chr(36) & '(v_C)"}';
，import UIKit
import CoreMotion
class ViewController: UIViewController {
@IBOutlet weak var rect1: UIView! // Add background color to be ale to see it
@IBOutlet weak var rect2: UIView!
@IBOutlet weak var xLabel: UILabel!
@IBOutlet weak var yLabel: UILabel!
@IBOutlet weak var zLabel: UILabel!
let motionManager = CMMotionManager() // The one and only for the app
override func viewDidLoad() {
super.viewDidLoad()
//The device motion object provides the device orientation in several equivalent forms: Euler angles, a rotation matrix, and a quaternion. Since we already use matrices to represent rotations in our Metal code, they are they best fit for incorporating Core Motion’s data into our app.
let motionHandler: CMDeviceMotionHandler = { [weak self] (motion, error) in
if let err = error { print(err) }
if let m = motion {
self?.xLabel.text = "Yaw: \(m.attitude.yaw)"
self?.yLabel.text = "Pitch: \(m.attitude.pitch)"
self?.zLabel.text = "Roll: \(m.attitude.roll)"
var transform: CATransform3D
transform = CATransform3DMakeRotation(CGFloat(m.attitude.pitch), 1, 0, 0) // X rotation
transform = CATransform3DRotate(transform, CGFloat(m.attitude.roll), 0, 1, 0) // Y rotation
transform = CATransform3DRotate(transform, CGFloat(m.attitude.yaw), 0, 0, 1) // Z rotation
print(transform)
self?.rect1.layer.transform = transform
// Mind coordinate space is most intuitive. The following transform differs.
// If you can tell why - please do.
let rm = m.attitude.rotationMatrix
transform = CATransform3D(m11: CGFloat(rm.m11), m12: CGFloat(rm.m12), m13: CGFloat(rm.m13), m14: 0,
m21: CGFloat(rm.m21), m22: CGFloat(rm.m22), m23: CGFloat(rm.m23), m24: 0,
m31: CGFloat(rm.m31), m32: CGFloat(rm.m32), m33: CGFloat(rm.m33), m34: 0,
m41: 0, m42: 0, m43: 0, m44: 1)
print(transform)
self?.rect2.layer.transform = transform
//self?.compass.layer.sublayerTransform = transform
//[myImage setNeedsDisplay];
}
}
motionManager.deviceMotionUpdateInterval = 0.1
if let current = OperationQueue.current {
motionManager.startDeviceMotionUpdates(using: .xArbitraryCorrectedZVertical/*.xTrueNorthZVertical*/, to: current, withHandler: motionHandler)
}
}
}
），并将其连接到viewController。旋转设备时，这些视图将进行相应的转换。您可以尝试CMQuaternion（rect1）做类似的工作。