iOS保存纬度/经度坐标到NSString以输出到标签

如何将纬度和经度坐标保存到nsstring，以便在其他函数中使用。基本上，我只想显示从要传递给uilabel的坐标中检索到的值

- (void)viewDidLoad
{
[super viewDidLoad];
[self getCurrentLocation];
NSLog(@"lat is %@ : lon is %@",self.latPoint, self.longPoint);

}

我试图用NSlog检索上面的内容，结果显示为null。我在.h文件中创建了两个NSString属性，即latPoint/longPoint

- (void)getCurrentLocation {
if ([CLLocationManager locationServicesEnabled]) {
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    [self.locationManager startUpdatingLocation];
} else {
    NSLog(@"Location services are not enabled");
}

}



- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *location = [locations lastObject];
self.latPoint = [NSString stringWithFormat:@"%f", location.coordinate.latitude];
self.lonPoint = [NSString stringWithFormat:@"%f", location.coordinate.longitude];
}

---

您看到的行为很可能是因为

CLLocationManager

回调是异步的。您对打印

self.latPoint

和

self.longPoint

（很可能）的NSLog调用发生在位置管理器找到并存储当前位置之前

如果移动

NSLog（@“lat is%@:lon is%@”、self.latPoint、self.longPoint）didUpdateLocations

方法调用code>语句，那么您应该看到，只要位置管理器找到（并更新）您的当前位置，就会调用它

您只需要对

CLLocationManager

回调作出反应，而不是试图假设何时找到位置

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *location = [locations lastObject];
    self.latPoint = [NSString stringWithFormat:@"%f", location.coordinate.latitude];
    self.lonPoint = [NSString stringWithFormat:@"%f", location.coordinate.longitude];

    NSLog(@"lat is %@ : lon is %@",self.latPoint, self.longPoint);
    //Now you know the location has been found, do other things, call others methods here
}

---

John

最有可能是因为位置管理器是异步的，并且在位置管理器有时间查找和存储当前位置之前，您对print selt.latpoint和self.longpoint的NSLog调用就发生了。将NSLog语句移动到didUpdateLocations方法。如何将值存储到nsstring，以便在其他方法中使用它？如何在ViewDidLoad中找到坐标后重新激活它？我是mapkit的新手。请帮助这是core location而不是mapkit，您试图重新激活什么？抱歉，我的意思是core location，如何将坐标保存到nsstring并在view加载时使用它