当用户到达某个位置时如何触发视频？

Posted 2023-03-05

【中文标题】当用户到达某个位置时如何触发视频？

【英文标题】：How to trigger a video when a user reaches a certain location?

【发布时间】：2011-08-09 11:28:07

【问题描述】：

这是我的 CoreLocationController.h 目标 c 类

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>

extern const CLLocationAccuracy kCLLocationAccuracyBest;
@protocol CoreLocationControllerDelegate 
@required
- (BOOL)startRegionMonitoring;
- (void)locationUpdate:(CLLocation *)location; // Our location updates are sent here
- (void)locationError:(NSError *)error; // Any errors are sent here
@end

@interface CoreLocationController : NSObject <CLLocationManagerDelegate, MKMapViewDelegate>      
CLLocationManager *locMgr;
CLLocationCoordinate2D coordinate;
IBOutlet MKMapView *worldView;
IBOutlet UIActivityIndicatorView *activityIndicator;
id delegate;
 

@property (nonatomic, retain) CLLocationManager *locMgr;
@property (nonatomic, assign) id delegate;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

@结束

这是 CorelocationController.m

#import "CoreLocationController.h"


@implementation CoreLocationController
@synthesize locMgr, delegate, coordinate;

- (id)init 
    self = [super init];

    if(self != nil) 
        self.locMgr = [[[CLLocationManager alloc] init] autorelease]; // Create new instance of locMgr
        self.locMgr.delegate = self; // Set the delegate as self.

        [locMgr setDistanceFilter:kCLDistanceFilterNone];
        [locMgr setDesiredAccuracy:kCLLocationAccuracyBest];

        [worldView setShowsUserLocation:YES];
    

    return self;


- (BOOL)startRegionMonitoring 

    if (![CLLocationManager regionMonitoringAvailable] || ![CLLocationManager regionMonitoringEnabled] )
        return NO;
    CLLocationCoordinate2D home;
    home.latitude = +51.49410630;
    home.longitude = -0.10251360;

    CLRegion * region = [[CLRegion alloc] initCircularRegionWithCenter:home radius:10.0 identifier:@"home"];
    if (locMgr == nil)
        locMgr = ([[CLLocationManager alloc] init]);
    [locMgr startMonitoringForRegion:region desiredAccuracy:kCLLocationAccuracyBest];

    [region release];
    return YES;


- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
    NSLog(@"Enteed location");
//  [self leavingHomeNotify];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location entered" message:@"Region entered" delegate:NULL cancelButtonTitle:@"OK" otherButtonTitles:NULL];
    [alert show];


- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
    if([self.delegate conformsToProtocol:@protocol(CoreLocationControllerDelegate)])   // Check if the class assigning itself as the delegate conforms to our protocol.  If not, the message will go nowhere.  Not good.
        [self.delegate locationUpdate:newLocation];

    


- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error 
    if([self.delegate conformsToProtocol:@protocol(CoreLocationControllerDelegate)])      // Check if the class assigning itself as the delegate conforms to our protocol.  If not, the message will go nowhere.  Not good.
        [self.delegate locationError:error];
    
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location failed" message:@"Location failed" delegate:NULL cancelButtonTitle:@"OK" otherButtonTitles:NULL];
    [alert show];

     - (void)dealloc 
    [self.locMgr release];
    [super dealloc];



@end

这是 CoreLocationDemoViewer.h

#import <UIKit/UIKit.h>
#import "CoreLocationController.h"
#import <MapKit/MapKit.h>

@interface CoreLocationDemoViewController : UIViewController <CoreLocationControllerDelegate, MKMapViewDelegate> 
    CoreLocationController *CLController;
    IBOutlet UILabel *locLabel;
    MKMapView *worldView;



@property (nonatomic, retain) CoreLocationController *CLController;
@property (nonatomic, retain) IBOutlet UILabel *locLabel;
@property (nonatomic, retain) MKMapView *worldView;

@end

这是 CoreLocationDemoViewer.m

#import "CoreLocationDemoViewController.h"


@implementation CoreLocationDemoViewController
@synthesize CLController;
@synthesize locLabel;
@synthesize worldView;


- (void)viewDidLoad 
    [super viewDidLoad];
    self.worldView.mapType = MKMapTypeStandard;   // also MKMapTypeSatellite or MKMapTypeHybrid
    CLController = [[CoreLocationController alloc] init];
    CLController.delegate = self;
    [CLController.locMgr startUpdatingLocation];


    worldView.zoomEnabled = YES;
    worldView.scrollEnabled = YES;



- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)u

    CLLocationCoordinate2D loc = [u coordinate];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
    [worldView setRegion:region animated:YES];




- (void)locationUpdate:(CLLocation *)location 
    locLabel.text = [location description];
//  [mapView setCenterCoordinate:location.coordinate];
//  [mapView setShowsUserLocation:YES];

    CLLocationCoordinate2D coord = [location coordinate];

    // Add it to the map view
//    [worldView addAnnotation:mp];

    // MKMapView retains its annotations, we can release
//  [mp release];

    // Zoom the region to this location
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 50, 50);
    [worldView setRegion:region animated:YES];

//   [locationManager stopUpdatingLocation];    


- (void)locationError:(NSError *)error 
    locLabel.text = [error description];


- (void)didReceiveMemoryWarning 
    [super didReceiveMemoryWarning];


// The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) 
        // Custom initialization.
    
    return self;

*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad 
    [super viewDidLoad];

*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);

*/



- (void)viewDidUnload 
    [super viewDidUnload];
     self.worldView = nil;

    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;



- (void)dealloc 
    [CLController release];
    [worldView release];
    [super dealloc];


@end

好的，这就是我想要的。到目前为止，它显示了带有用户位置的地图 它会找到标签上显示的确切位置..如果我做错了什么，请纠正..

我想做的是在用户到达某个位置时触发视频...

我快到了吧？

【问题讨论】：

看起来您已经为位置片段设置了正确的一切。到目前为止，您的代码是否存在问题，或者只是想验证您迄今为止所做的工作？

【参考方案1】：

我认为，如果您只是无法正确缩放 mapView，请使用这篇文章中的 MKCoordinate 内容，How do I zoom an MKMapView。

我正在开发一个地图视图，它可以缩放到合适的水平以供查看，我正在为地图设置 lattitudeDelta 和 longitudeDelta。对我有用。

【参考方案2】：

也许设置委托有问题？我通常像这样在 .h 文件中指定委托：

id <CoreLocationControllerDelegate> delegate;

和

@property (nonatomic, assign) id <CoreLocationControllerDelegate> delegate;

编辑

另外，您是否检查过-mapView:didUpdateUserLocation: 是否被调用？

【讨论】：

我刚刚插入了一个 NSLog 以查看是否调用了 mapview 并且似乎没有出现.. 我该怎么办？？？ NSLog(@"mapview 被调用");

【参考方案3】：

我没有看到您为 worldView 分配代理（但您为其他事情分配了代理）。尝试在您的viewDidLoad 中添加worldView.delegate = self;。

【讨论】：

我做到了，但你认为 mapview 没有被调用没有区别吗？我能做些什么呢？非常感谢你hhhhhh我是一个新手

尝试在你认为没有被调用的地方添加一个断点。如果断点被命中，那么它就会被调用。如果没有，则不会调用该方法。只需单击编辑器左侧的行添加断点 (useyourloaf.com/blog/2011/2/21/xcode-breakpoint-actions.html)。