iOS UIView.animatewithDuration在Swift 2.2中？

这是一个使用UIMapKit的天桥动画，基本上动画从摄像机角度变化开始，然后在物体上旋转。我得到错误，我不知道什么是错的。请帮忙。iOS UIView.animatewithDuration在Swift 2.2中？

“节距是摄像机的视角，以度为单位。 0导致摄像机A 值指出直下地图。角度大于0结果在照相机中被投朝向地平线通过的程度的指定的号码。如果地图类型是卫星或混合，间距值被钳位为0

在该属性的值可以被钳位到一个最大值保持地图的可读性。虽然没有固定的最大值，但是，因为实际最大值取决于相机的当前海拔高度。“

现在的问题是，根据下面的代码，我初始化UIMapView间距值设置为0楼下，覆盖FUNC，当它的时候的动画，我将值更改为65，所以我希望相机角度（pitch）会发生变化，但是当我在模拟器中运行时，摄像机仍然直接指向地图。但是旋转动画正在工作，因为倾斜相机和旋转相机之间的标题已经改变。

我不知道我的音高设置有什么问题。我错过了什么？我应该添加高度属性吗？仍然试图弄清楚。

https://developer.apple.com/reference/mapkit/mkmapcamera

import UIKit 
import MapKit 
import CoreLocation 
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate { 

    let distance: CLLocationDistance = 700 
    let pitch: CGFloat = 65 
    let heading = 90.0 
    var camera = MKMapCamera() 
    let coordinate = CLLocationCoordinate2D(latitude: 40.7484405, 
              longitude: -73.9856644) 
    @IBOutlet weak var mapView: MKMapView! 


    override func viewDidLoad() { 
     super.viewDidLoad() 
     mapView.mapType = .SatelliteFlyover 

     camera = = MKMapCamera(lookingAtCenterCoordinate: coordinate, 
          fromDistance: distance, 
          pitch: 0, 
          heading: 0) 
     self.mapView.camera = camera 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func viewDidAppear(animated: Bool) { 
     let pitchedCamera = MKMapCamera(lookingAtCenterCoordinate: coordinate, fromDistance: distance, pitch: pitch, heading: 0) 
     let rotatedCamera = MKMapCamera(lookingAtCenterCoordinate: coordinate, fromDistance: distance, pitch: pitch, heading: 180) 

     UIView.animateWithDuration(5.0, animations: { 
      self.mapView.camera = pitchedCamera 

      }, completion: { 
       (Completed: Bool) -> Void in 

       UIView.animateWithDuration(25.0, delay: 0, options: UIViewAnimationOptions.CurveLinear, animations: { 
        self.mapView.camera = rotatedCamera 
        }, completion: nil) 

       }) 
     } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

}

来源

2016-06-22 Tom Xue

我想通了，原来的的iOS模拟器不支持天桥。所以当我在真实设备上运行它时，我的美丽天桥动画就像我期望的一样。

来源

2016-06-23 07:35:36

iOS UIView.animatewithDuration在Swift 2.2中？

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