Question

我想获取当前位置，我看到这段代码，但是如何在点击按钮时分配这个纬度和经度标签？

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation   *)newLocation fromLocation:(CLLocation *)oldLocation {

    NSLog(@"latitudeAAAAA %f",newLocation.coordinate.latitude );
    NSLog(@"longitudeAAAA %f",newLocation.coordinate.longitude);
    [corelocation stopUpdatingLocation];
}

Answer 1

label.text = [NSString stringWithFormat:@"%lf,%lf", newLocation.coordinate.latitude, newLocation.coordinate.longitude];

Answer 2

您需要将自己的类设置为CLLocationManager的委托，然后调用startUpdatingLocation（docs）以使其调用您提到的方法。在您要求它开始更新位置之后，回调将在某个时刻到来，并且在您要求它停止之前一直继续。如果它应该自己启动，你必须弄清楚你的用例，但是当用户点击按钮时，或者如果更新应该开始，那么只保存位置（或者你想用它做什么）当用户点击时（我不太确定你的问题是什么意思）。

https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/CLLocationManager/CLLocationManager.html#//apple_ref/doc/uid/TP40007125-CH3-SW2

Answer 3

在界面构建器中，将touchUpInside事件设置为调用- (IBAction)buttonClicked:(id)sender（或以编程方式设置操作），然后将按钮委托给self。在viewDidLoad设置locationManager：

- (void)viewDidLoad {
    [super viewDidLoad];
    self.locationManager = [[[CLLocationManager alloc] init] autorelease];
    [locationManager setDelegate:self];
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    [locationManager setDistanceFilter:kCLDistanceFilterNone];
    [locationManager startUpdatingLocation];
}

按钮操作：

- (IBAction)buttonClicked:(id)sender {
    myLabel.text = [NSString stringWithFormat:@"%+.6f,%+.6f", locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude];
    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"Button clicked" message:myLabel.text  delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
    [alert show];

}

位置管理器委托方法：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    NSDate* eventDate = newLocation.timestamp;
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
    if (abs(howRecent) < 5.0) {
        NSLog(@"New Latitude %+.6f, Longitude %+.6f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
    }
}

获得当前的经度和纬度

3 个答案: