ios - 返回值时iOS问题中的线程
<p><pre><code>class ViewController: UIViewController, CLLocationManagerDelegate {
var locationManager = CLLocationManager()
var lat: Double! = 0.0
var long: Double! = 0.0
override func viewDidLoad() {
super.viewDidLoad()
self.findMyLocation()
print(self.lat)
print(self.long)
}
func findMyLocation() {
self.locationManager = CLLocationManager()
locationManager.requestAlwaysAuthorization()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startMonitoringSignificantLocationChanges()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.requestWhenInUseAuthorization()
// Here we start locating
locationManager.startUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: ) {
for location in locations {
self.lat = location.coordinate.latitude
self.long = location.coordinate.longitude
}
locationManager.stopUpdatingLocation()
}
}
</code></pre>
<p>这是我的简单 ViewController ,用于获取我当前位置的纬度和经度,并将其分配给局部变量 <code>lat</code> 和 <code>long</code> 然后 <code>print</code> 它。上面的代码总是为 <code>lat</code> 和 <code>long</code> 打印 0.0。这样做的原因是因为首先执行 <code>print(lat) print(long)</code>,然后执行获取位置。我确信有一些非常简单的方法可以解决这个问题,但我不知道该怎么做。任何帮助表示赞赏。我假设我们必须与大中央调度合作。请建议我应该看什么。 </p>
<p>另外,我已将 <code>NSLocationWhenInUseUsageDescription</code> 添加到 <code>info.plist</code>。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您只能在位置管理器找到一些坐标后打印坐标,即在函数<code>locationManager(manager: CLLocationManager, didUpdateLocations locations: )</code>中。<br/>
但是当位置管理器还没有坐标时,您尝试在 <code>viewDidLoad</code> 中打印它们。</p></p>
<p style="font-size: 20px;">关于ios - 返回值时iOS问题中的线程,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/40200054/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40200054/
</a>
</p>
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