如何动态更改分段控件中标签中的值？ Swift 4, iOS
How to dinamically change values in labels in a SegmentedControl? Swift 4, iOS
我在执行分段控件时遇到了一些问题。
我来找你（更有经验的人）是为了得到一些关于我应该做什么来解决这个问题的建议。我来了：
对于"current"选项卡，"Panel's optimal azimuth"和"Panel's optimal tilt angle"应该是"tracking the sun"（我稍后会添加的代码），换句话说：这2个字段必须实时更新（同样，我稍后会做的代码）。 "Panel's current azimuth" 和 "Panels current tilt angle" 基本上根据 phone 的位置而变化（我使用 coreMotion 和 coreLocation 来获取它们）。
问题是这样的（解释后添加图片）：
对于"current"选项卡，"panel's optimal azimuth"和"Panel's optimal tilt angle"的字段必须随时间变化。 "Panel's current tilt angle" 必须从头开始显示
面板 (phone's) 倾斜但它不这样做（仅当您 select 另一个选项卡时才这样做）。
"Panel's Optimal Tilt Angle" 必须有一个固定的（但不同的）值
3、6 个月和 "Year" 选项卡。 "Panel's Optimal Azimuth" 与 3、6 个月和 "year" 选项卡相同（该代码我稍后也会添加）。然而，当我 select "Current" 选项卡时，我遇到了问题，在这里，"Panel's optimal Azimuth" 获得值 "tracking the sun"，并且
当我选择另一个选项卡时，该值应该保持为“180º”。只有当 phone 仍在表面上时才会发生这种情况，只要我移动 phone，该字段中的值就会变为 180º。当我从其他选项卡转到 "current" 选项卡时会发生相反的情况（而不是显示 "tracking the sun" 它显示“180º”，同样，当 phone 移动时会出现此值，但是如果phone 静止，"tracking the sun" 显示）。
基本上，唯一正常工作的字段是分段控件中所有 4 个选项卡中的 "Panel's current Azimuth"。
请参考图片以获得更好的想法。
What I get in the initial view
What I want in the initial view
What I get if the phone is moving (this is correct for the 3, 6 months and year tabs)
What I get if the phone is still, if I chose the "current" tab while the phone was still and then I selected another tab
Same as previos image
所以，我的问题是：我该怎么做才能防止这种情况发生？我尝试在与分段控件对应的@IBAction 中使用switch-case 语句，但显然它不起作用。我在这
与您分享我在项目中使用的代码：
import UIKit
import CoreMotion
import CoreLocation
class PVOrientationViewController: UIViewController, CLLocationManagerDelegate {
//MARK: - Constants and Variables
let motionManager = CMMotionManager()
let locationManager = CLLocationManager()
var segIndex = 0
//MARK: - Outlets, views, actions
@IBOutlet weak var panelOptimalAz: UILabel!
@IBOutlet weak var panelOptimalTilt: UILabel!
@IBOutlet weak var panelCurrentAz: UILabel!
@IBOutlet weak var panelCurrentTilt: UILabel!
@IBOutlet weak var segmentedControl: UISegmentedControl!
//MARK: - Action of the Segmented Button.
@IBAction func indexChanged(_ sender: Any) {
segIndex = segmentedControl.selectedSegmentIndex
switch segIndex {
case 0:
print("Current Tab")
panelOptimalAz.text = "Tracking the Sun"
panelCurrentTilt.text = myDeviceMotion()
case 1:
print("3 months Tab")
panelCurrentTilt.text = String(myDeviceMotion())
case 2:
print("6 months Tab")
panelCurrentTilt.text = String(myDeviceMotion())
case 3:
print("Year tab")
panelCurrentTilt.text = String(myDeviceMotion())
default:
panelOptimalAz.text = "No Optimal Azimuth given"
panelCurrentAz.text = "No Current Azimuth given"
panelCurrentTilt.text = "No Current Tilt given"
panelOptimalTilt.text = "No Optimal Tilt given"
}
}
//MARK: - viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
// Azimuth
if (CLLocationManager.headingAvailable()) {
locationManager.headingFilter = 1
locationManager.startUpdatingHeading()
}
}
//MARK: - Motion methods
func myDeviceMotion() -> String{
var currentTilt:String = "0.0º"
if motionManager.isDeviceMotionAvailable {
motionManager.deviceMotionUpdateInterval = 0.1
motionManager.startDeviceMotionUpdates(to: OperationQueue()) {(motion, error) -> Void in
if let attitude = motion?.attitude {
DispatchQueue.main.async{
self.panelCurrentTilt.text = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
currentTilt = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
}
}
}
print("Device motion started")
}else {
print("Device motion unavailable")
}
return currentTilt
}
//MARK: - True heading and panel's heading
func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {
let trueHeading = heading.trueHeading
self.panelCurrentAz.text = "\(String(format: "%.0f", trueHeading))º"
//If latitude >= 0, then panel's azimuth = 180º, else, it is 0º
var panelHeading = 0.0
if GlobalData.latit >= 0.0{
self.panelOptimalAz.text = "180º"
panelHeading = trueHeading - 180.0
if panelHeading < 0{
panelHeading += 360.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
} else {
panelHeading += 0.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}else{
self.panelOptimalAz.text = "0º"
panelHeading = trueHeading + 180.0
if panelHeading > 359.0{
panelHeading -= 360.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
} else {
panelHeading += 0.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}
}
}
提前感谢您的宝贵时间和建议。
你好。
回顾...
OptimalAz 标签应该说 "Tracking the Sun" 如果 当前选择的段是 "Current",所以在 didUpdateHeading 中添加一个 if () 以仅在选择其他段时更新该标签。
在 viewDidLoad() 中启动运动管理器（连同位置管理器）...它将继续 运行 - 并继续更新标签 - 因此不需要 myDeviceMotion() 功能
在 viewDidLoad() 结束时，触发 indexChanged() 初始化标签（以及任何其他需要的任务/变量），就像用户点击 "Current" 片段一样。
试一试（我想我在代码中添加了足够的注释来解释任何更改）：
import UIKit
import CoreMotion
import CoreLocation
class PVOrientationViewController: UIViewController, CLLocationManagerDelegate {
//MARK: - Constants and Variables
let motionManager = CMMotionManager()
let locationManager = CLLocationManager()
var segIndex = 0
//MARK: - Outlets, views, actions
@IBOutlet weak var panelOptimalAz: UILabel!
@IBOutlet weak var panelOptimalTilt: UILabel!
@IBOutlet weak var panelCurrentAz: UILabel!
@IBOutlet weak var panelCurrentTilt: UILabel!
@IBOutlet weak var segmentedControl: UISegmentedControl!
//MARK: - Action of the Segmented Button.
@IBAction func indexChanged(_ sender: Any) {
segIndex = segmentedControl.selectedSegmentIndex
switch segIndex {
case 0:
print("Current Tab")
panelOptimalAz.text = "Tracking the Sun"
case 1:
print("3 months Tab")
// do something related to 3 months
case 2:
print("6 months Tab")
// do something related to 6 months
case 3:
print("Year tab")
// do something related to Year
default:
panelOptimalAz.text = "No Optimal Azimuth given"
panelCurrentAz.text = "No Current Azimuth given"
panelCurrentTilt.text = "No Current Tilt given"
panelOptimalTilt.text = "No Optimal Tilt given"
}
}
//MARK: - viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
// Azimuth
if (CLLocationManager.headingAvailable()) {
locationManager.headingFilter = 1
locationManager.startUpdatingHeading()
}
// start the motion manager here, since we want it running all the time
if motionManager.isDeviceMotionAvailable {
motionManager.deviceMotionUpdateInterval = 0.1
motionManager.startDeviceMotionUpdates(to: OperationQueue()) {(motion, error) -> Void in
if let attitude = motion?.attitude {
DispatchQueue.main.async{
self.panelCurrentTilt.text = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
}
}
}
print("Device motion started")
}else {
print("Device motion unavailable")
}
// call segment changed to update on start (as if user tapped seg 0)
self.indexChanged(segmentedControl)
}
//MARK: - Motion methods
// no need for this
// func myDeviceMotion() -> String{
//
// var currentTilt:String = "0.0º"
//
// return currentTilt
//
// }
//MARK: - True heading and panel's heading
func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {
let trueHeading = heading.trueHeading
//If latitude >= 0, then panel's azimuth = 180º, else, it is 0º
var panelHeading = 0.0
// I don't have your GlobalData object, so
// just hard-coding 1.0 here...
// if GlobalData.latit >= 0.0{
if 1.0 >= 0.0 {
// only update Optimal Az label if "Current" seg is NOT selected
if self.segmentedControl.selectedSegmentIndex != 0 {
self.panelOptimalAz.text = "180º"
}
panelHeading = trueHeading - 180.0
if panelHeading < 0{
panelHeading += 360.0
}
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}else{
// only update Optimal Az label if "Current" seg is NOT selected
if self.segmentedControl.selectedSegmentIndex != 0 {
self.panelOptimalAz.text = "0º"
}
panelHeading = trueHeading + 180.0
if panelHeading > 359.0{
panelHeading -= 360.0
}
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}
}
我在执行分段控件时遇到了一些问题。 我来找你（更有经验的人）是为了得到一些关于我应该做什么来解决这个问题的建议。我来了：
对于"current"选项卡，"Panel's optimal azimuth"和"Panel's optimal tilt angle"应该是"tracking the sun"（我稍后会添加的代码），换句话说：这2个字段必须实时更新（同样，我稍后会做的代码）。 "Panel's current azimuth" 和 "Panels current tilt angle" 基本上根据 phone 的位置而变化（我使用 coreMotion 和 coreLocation 来获取它们）。
问题是这样的（解释后添加图片）：
对于"current"选项卡，"panel's optimal azimuth"和"Panel's optimal tilt angle"的字段必须随时间变化。 "Panel's current tilt angle" 必须从头开始显示 面板 (phone's) 倾斜但它不这样做（仅当您 select 另一个选项卡时才这样做）。
"Panel's Optimal Tilt Angle" 必须有一个固定的（但不同的）值 3、6 个月和 "Year" 选项卡。 "Panel's Optimal Azimuth" 与 3、6 个月和 "year" 选项卡相同（该代码我稍后也会添加）。然而，当我 select "Current" 选项卡时，我遇到了问题，在这里，"Panel's optimal Azimuth" 获得值 "tracking the sun"，并且 当我选择另一个选项卡时，该值应该保持为“180º”。只有当 phone 仍在表面上时才会发生这种情况，只要我移动 phone，该字段中的值就会变为 180º。当我从其他选项卡转到 "current" 选项卡时会发生相反的情况（而不是显示 "tracking the sun" 它显示“180º”，同样，当 phone 移动时会出现此值，但是如果phone 静止，"tracking the sun" 显示）。
基本上，唯一正常工作的字段是分段控件中所有 4 个选项卡中的 "Panel's current Azimuth"。
请参考图片以获得更好的想法。
What I get in the initial view
What I want in the initial view
What I get if the phone is moving (this is correct for the 3, 6 months and year tabs)
What I get if the phone is still, if I chose the "current" tab while the phone was still and then I selected another tab
Same as previos image
所以，我的问题是：我该怎么做才能防止这种情况发生？我尝试在与分段控件对应的@IBAction 中使用switch-case 语句，但显然它不起作用。我在这 与您分享我在项目中使用的代码：
import UIKit
import CoreMotion
import CoreLocation
class PVOrientationViewController: UIViewController, CLLocationManagerDelegate {
//MARK: - Constants and Variables
let motionManager = CMMotionManager()
let locationManager = CLLocationManager()
var segIndex = 0
//MARK: - Outlets, views, actions
@IBOutlet weak var panelOptimalAz: UILabel!
@IBOutlet weak var panelOptimalTilt: UILabel!
@IBOutlet weak var panelCurrentAz: UILabel!
@IBOutlet weak var panelCurrentTilt: UILabel!
@IBOutlet weak var segmentedControl: UISegmentedControl!
//MARK: - Action of the Segmented Button.
@IBAction func indexChanged(_ sender: Any) {
segIndex = segmentedControl.selectedSegmentIndex
switch segIndex {
case 0:
print("Current Tab")
panelOptimalAz.text = "Tracking the Sun"
panelCurrentTilt.text = myDeviceMotion()
case 1:
print("3 months Tab")
panelCurrentTilt.text = String(myDeviceMotion())
case 2:
print("6 months Tab")
panelCurrentTilt.text = String(myDeviceMotion())
case 3:
print("Year tab")
panelCurrentTilt.text = String(myDeviceMotion())
default:
panelOptimalAz.text = "No Optimal Azimuth given"
panelCurrentAz.text = "No Current Azimuth given"
panelCurrentTilt.text = "No Current Tilt given"
panelOptimalTilt.text = "No Optimal Tilt given"
}
}
//MARK: - viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
// Azimuth
if (CLLocationManager.headingAvailable()) {
locationManager.headingFilter = 1
locationManager.startUpdatingHeading()
}
}
//MARK: - Motion methods
func myDeviceMotion() -> String{
var currentTilt:String = "0.0º"
if motionManager.isDeviceMotionAvailable {
motionManager.deviceMotionUpdateInterval = 0.1
motionManager.startDeviceMotionUpdates(to: OperationQueue()) {(motion, error) -> Void in
if let attitude = motion?.attitude {
DispatchQueue.main.async{
self.panelCurrentTilt.text = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
currentTilt = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
}
}
}
print("Device motion started")
}else {
print("Device motion unavailable")
}
return currentTilt
}
//MARK: - True heading and panel's heading
func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {
let trueHeading = heading.trueHeading
self.panelCurrentAz.text = "\(String(format: "%.0f", trueHeading))º"
//If latitude >= 0, then panel's azimuth = 180º, else, it is 0º
var panelHeading = 0.0
if GlobalData.latit >= 0.0{
self.panelOptimalAz.text = "180º"
panelHeading = trueHeading - 180.0
if panelHeading < 0{
panelHeading += 360.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
} else {
panelHeading += 0.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}else{
self.panelOptimalAz.text = "0º"
panelHeading = trueHeading + 180.0
if panelHeading > 359.0{
panelHeading -= 360.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
} else {
panelHeading += 0.0
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}
}
}
提前感谢您的宝贵时间和建议。
你好。
回顾...
OptimalAz 标签应该说 "Tracking the Sun" 如果 当前选择的段是 "Current",所以在 didUpdateHeading 中添加一个 if () 以仅在选择其他段时更新该标签。
在 viewDidLoad() 中启动运动管理器（连同位置管理器）...它将继续 运行 - 并继续更新标签 - 因此不需要 myDeviceMotion() 功能
在 viewDidLoad() 结束时，触发 indexChanged() 初始化标签（以及任何其他需要的任务/变量），就像用户点击 "Current" 片段一样。
试一试（我想我在代码中添加了足够的注释来解释任何更改）：
import UIKit
import CoreMotion
import CoreLocation
class PVOrientationViewController: UIViewController, CLLocationManagerDelegate {
//MARK: - Constants and Variables
let motionManager = CMMotionManager()
let locationManager = CLLocationManager()
var segIndex = 0
//MARK: - Outlets, views, actions
@IBOutlet weak var panelOptimalAz: UILabel!
@IBOutlet weak var panelOptimalTilt: UILabel!
@IBOutlet weak var panelCurrentAz: UILabel!
@IBOutlet weak var panelCurrentTilt: UILabel!
@IBOutlet weak var segmentedControl: UISegmentedControl!
//MARK: - Action of the Segmented Button.
@IBAction func indexChanged(_ sender: Any) {
segIndex = segmentedControl.selectedSegmentIndex
switch segIndex {
case 0:
print("Current Tab")
panelOptimalAz.text = "Tracking the Sun"
case 1:
print("3 months Tab")
// do something related to 3 months
case 2:
print("6 months Tab")
// do something related to 6 months
case 3:
print("Year tab")
// do something related to Year
default:
panelOptimalAz.text = "No Optimal Azimuth given"
panelCurrentAz.text = "No Current Azimuth given"
panelCurrentTilt.text = "No Current Tilt given"
panelOptimalTilt.text = "No Optimal Tilt given"
}
}
//MARK: - viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
locationManager.delegate = self
// Azimuth
if (CLLocationManager.headingAvailable()) {
locationManager.headingFilter = 1
locationManager.startUpdatingHeading()
}
// start the motion manager here, since we want it running all the time
if motionManager.isDeviceMotionAvailable {
motionManager.deviceMotionUpdateInterval = 0.1
motionManager.startDeviceMotionUpdates(to: OperationQueue()) {(motion, error) -> Void in
if let attitude = motion?.attitude {
DispatchQueue.main.async{
self.panelCurrentTilt.text = "\(String(format:"%.0f", attitude.pitch * 180 / Double.pi))º"
}
}
}
print("Device motion started")
}else {
print("Device motion unavailable")
}
// call segment changed to update on start (as if user tapped seg 0)
self.indexChanged(segmentedControl)
}
//MARK: - Motion methods
// no need for this
// func myDeviceMotion() -> String{
//
// var currentTilt:String = "0.0º"
//
// return currentTilt
//
// }
//MARK: - True heading and panel's heading
func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {
let trueHeading = heading.trueHeading
//If latitude >= 0, then panel's azimuth = 180º, else, it is 0º
var panelHeading = 0.0
// I don't have your GlobalData object, so
// just hard-coding 1.0 here...
// if GlobalData.latit >= 0.0{
if 1.0 >= 0.0 {
// only update Optimal Az label if "Current" seg is NOT selected
if self.segmentedControl.selectedSegmentIndex != 0 {
self.panelOptimalAz.text = "180º"
}
panelHeading = trueHeading - 180.0
if panelHeading < 0{
panelHeading += 360.0
}
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}else{
// only update Optimal Az label if "Current" seg is NOT selected
if self.segmentedControl.selectedSegmentIndex != 0 {
self.panelOptimalAz.text = "0º"
}
panelHeading = trueHeading + 180.0
if panelHeading > 359.0{
panelHeading -= 360.0
}
self.panelCurrentAz.text = "\(String(format: "%.0f", panelHeading))º"
}
}
}