CLLocationDistance转换

Question

我在CLLocationDistance类型的变量中有距离，我需要将它转换为整数变量，我该怎么做呢

我有用处

CLLocationDistance kilometers;

int distance = [kilometers intValue];

但它给出了错误。

帮助那些家伙

Answer 1

https://developer.apple.com/library/mac/#documentation/CoreLocation/Reference/CLLocation_Class/CLLocation/CLLocation.html

distanceFromLocation:

返回从接收者的位置到指定位置的距离(以米为单位)。

- (CLLocationDistance)distanceFromLocation:(const CLLocation *)location

参数

位置另一个位置。

返回值两个位置之间的距离(米)。

返回类型不是int，而是double。而且它也不是NSNumber。

Answer 2

这将使用CLLocationDistance计算两个位置之间的距离。默认情况下，它以米为单位给出值。要转换为千米，请将CLLocationDistance/1000.0除以。为了得到里程数乘以CLLocationDistance*0.62137。

 //Pass your current location Latitude and longitude
                     CLLocation *currentlocation = [[CLLocation alloc] initWithLatitude:13.015370f  longitude:80.200393f];
 //Pass your destination location Latitude and longitude 
CLLocation *destination = [[CLLocation alloc] initWithLatitude:37.420948f longitude:-122.09578499999998f];
CLLocationDistance meters = [currentlocation distanceFromLocation:destination];
//get distance in meters
    NSLog(@"meters :%f", meters);
//get distance in kilometers
    CLLocationDistance kilometers = meters / 1000.0;
    NSLog(@"kilometers :%f", kilometers);
//Get distance in miles
    NSLog(@"Miles:%f",kilometers*0.62137);
//convert kilometers to int value
    int num=kilometers;

Answer 3

从iOS 10开始，有了一个新的Measurement类，它使得转换距离变得轻而易举。

下面是一个转换距离的扩展：

extension Double {
  func convert(from originalUnit: UnitLength, to convertedUnit: UnitLength) -> Double {
    return Measurement(value: self, unit: originalUnit).converted(to: convertedUnit).value
  }
}

示例用法：

let miles = 1.0
let metersInAMile = miles.convert(from: .miles, to: .meters)

let mileInFeet = 5280.0
let feetInAMile = mileInFeet.convert(from: .feet, to: .miles)

let marathonInFeet = 138_435.0
let milesInMarathon = marathonInFeet.convert(from: .feet, to: .miles)
let kmInMarathon = marathonInFeet.convert(from: .feet, to: .kilometers)

let inch = 1.0
let centimetersInInch = inch.convert(from: .inches, to: .centimeters)