Question

let latitude = NSUserDefaults .standardUserDefaults().valueForKey(klat) as! Double

 let longitude = NSUserDefaults .standardUserDefaults().valueForKey(klong) as! Double


let location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)

//Second Location lat and long
let latitudeSec:CLLocationDegrees = 11.0100
let longitudeSec:CLLocationDegrees = 77.3620

let locationSec:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitudeSec, longitudeSec)

let span:MKCoordinateSpan = MKCoordinateSpanMake(1, 1)

let region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)

mapView.setRegion(region, animated: true)


let myAn1 = MyAnnotation(title: "Office", coordinate: location,subtitle: "MyOffice");

我无法使用关键字“klat and”klong中的NSUserDefaults检索我之前存储在应用程序中的地图位置“它显示以下错误：

“无法将'_ NSCFString'类型的值（0x1604da4）转换为'NSNumber'（0x971800）”

Answer 1

使用以下代码存储纬度和经度

#include <iostream>

void CompressString (std::string str)
{
    //count will keep track of the number of occurences of any given character
    unsigned int count = 1;

    //new string to store the values from the original string
    std::string str2 = "";

    //store the first letter of the string initially
    char ch = str[0];

    //run a loop from the second character of the string since first character if stored in "ch"
    for (unsigned int i = 1; i < str.length(); i++)
    {
        if (str[i] == ch)
            count++;
        else
        {
            str2 = str2 + ch + std::to_string (count);
            ch = str[i];
            count = 1;
        }
    }

    //for cases like aabbb
    str2 = str2 + ch + std::to_string (count);

    //check if after compression, the length of the string reduces or not
    if (str.length() > str2.length())
        std::cout << str2 << std::endl;
    else
        std::cout << str << std::endl;
}

int main ()
{
    std::cout << "Enter a string to compress: ";
    std::string str;
    getline (std::cin, str);

    std::cout << "Compressed string is: ";
    CompressString (str);
    return 0;
}

用于检索

[[NSUserDefaults standardUserDefaults] setDouble:latitude forKey:klat]
[[NSUserDefaults standardUserDefaults] setDouble:longitude forKey:klong]

无法使用swift ios在mapView中检索lat和long位置

1 个答案: