我正在为我的编程课程做一个项目,使用Xcode中的Swift语言。我想创建一个使用陀螺仪的应用程序,但由于我不知道如何解决Xcode中的一些错误,因此无法在我的iPhone上运行它。当我运行程序时,会显示“fatal error: unexpectedly found nil while unwrapping an Optional value(lldb)”。
我的项目主要目的是在iPhone屏幕上显示旋转(偏航角、俯仰角和翻滚角)的度数,并利用陀螺仪进行测量。如果有人能帮助我解决这个问题,我将非常感激。谢谢您提前的帮助。
我的ViewController中的代码:
我的ViewController中的代码:
import UIKit
import CoreMotion
class ViewController: UIViewController {
var currentMaxRotX: Double = 0.0
var currentMaxRotY: Double = 0.0
var currentMaxRotZ: Double = 0.0
let motionManager = CMMotionManager()
@IBOutlet var rotX : UILabel! = nil
@IBOutlet var rotY : UILabel! = nil
@IBOutlet var rotZ : UILabel! = nil
@IBOutlet var maxRotX : UILabel! = nil
@IBOutlet var maxRotY : UILabel! = nil
@IBOutlet var maxRotZ : UILabel! = nil
@IBOutlet weak var RollLabel: UILabel! = nil
@IBOutlet weak var PitchLabel: UILabel! = nil
@IBOutlet weak var YawLabel: UILabel! = nil
override func viewDidLoad() {
if motionManager.gyroAvailable {
if !motionManager.gyroActive {
motionManager.gyroUpdateInterval = 0.2
motionManager.startGyroUpdates()
//motionManager = [[CMMotionManager alloc]init]; should I use this ???
//motionManager.deviceMotionUpdateInterval = 0.2;
//motionManager.startDeviceMotionUpdates()
motionManager.startGyroUpdatesToQueue(NSOperationQueue.currentQueue(), withHandler: {(gyroData: CMGyroData!, error: NSError!)in
self.outputRotationData(gyroData.rotationRate)
if (error != nil)
{
println("\(error)")
}
})
}
} else {
var alert = UIAlertController(title: "No gyro", message: "Get a Gyro", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
super.viewDidLoad()
}
// radians to degrees
func radians(fromDegrees degrees: Double) -> Double {
return 180 * degrees / M_PI
}
func outputRotationData(rotation:CMRotationRate)
{
rotX.text = NSString(format:"Rotation X: %.4f",rotation.x)
if fabs(rotation.x) > fabs(currentMaxRotX)
{
currentMaxRotX = rotation.x
}
rotY.text = NSString(format:"Rotation Y: %.4f", rotation.y)
if fabs(rotation.y) > fabs(currentMaxRotY)
{
currentMaxRotY = rotation.y
}
rotZ.text = NSString(format:"Rotation Z:%.4f", rotation.z)
if fabs(rotation.z) > fabs(currentMaxRotZ)
{
currentMaxRotZ = rotation.z
}
maxRotX.text = NSString(format:"Max rotation X: %.4f", currentMaxRotX)
maxRotY.text = NSString(format:"Max rotation Y:%.4f", currentMaxRotY)
maxRotZ.text = NSString(format:"Max rotation Z:%.4f", currentMaxRotZ)
var attitude = CMAttitude()
var motion = CMDeviceMotion()
motion = motionManager.deviceMotion
attitude = motion.attitude
YawLabel.text = NSString (format: "Yaw: %.2f", attitude.yaw) //radians to degress NOT WORKING
PitchLabel.text = NSString (format: "Pitch: %.2f", attitude.pitch)//radians to degress NOT WORKING
RollLabel.text = NSString (format: "Roll: %.2f", attitude.roll)//radians to degress NOT WORKING
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}