Question

我编写了简单的mapView应用程序。它显示了两种问题。

1-执行在线程1停止：信号SIGABRT错误。

2-此函数显示编译时错误。

- (IBAction)findMe:(id)sender {

     If( [[toggleButton titleForState:UIControlStateNormal] isEqualToString:@"Find Me"] )
     {
     [toggleButton setTitle:@"Hide Me" forState:UIControlStateNormal];
     mapView.showsUserLocation=YES;
     }
     else
     {
     [toggleButton setTitle:@"Find Me" forState:UIControlStateNormal];
     mapView.showsUserLocation=NO;
     }

}

如何删除这些错误？

我想在我的代码中放置多个位置的坐标我希望在地图上显示loc.png图标，对应于那些坐标我将如何完成此任务？

您可以通过以下链接查看示例项目：https://drive.google.com/open?id=0B5pNDpbvZ8SnRmNFS0pjVnJFWHc

Answer 1

由于以下三个原因，您收到编译时错误：

1）你在if-else条件下使用的“If”应该是“if”，即小写。

2）。您有一个IBOutlet连接到storyboard中的findMe按钮，在视图控制器中不存在。所以要么删除它，要么添加它。

3）您正在使用MKMapView，但您没有在项目的构建阶段选项的“链接二进制文件”中添加MapKit框架。

请执行所有这些步骤以编译代码并进行编译。执行错误。

Answer 2

回答您的问题：
我想在我的代码中放置多个位置的坐标我希望在地图上显示loc.png图标，这些坐标对应于我如何完成此任务？

以下是ViewController.h的代码

＆＃13;

onActivate

＆＃13;

以下是ViewController.m的代码

＆＃13;

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate>

@end

＆＃13;

添加新文件MyAnnotation.h / MyAnnotation.m

以下是MyAnnotation.h的代码

＆＃13;

#import "ViewController.h"
#import "MyAnnotation.h"
#import <MapKit/MapKit.h>

@interface ViewController ()

@property (strong, nonatomic) IBOutlet MKMapView *myMapView;

@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];

    // setup the map view, delegate and current location

    [self.myMapView setDelegate:self];

    self.myMapView.mapType = MKMapTypeStandard;

    CLLocationCoordinate2D myLocation = CLLocationCoordinate2DMake(25.085130,-77.331428);
    [self.myMapView setCenterCoordinate:myLocation];

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(myLocation, 2000, 2000);
    region.center = self.myMapView.centerCoordinate;
    self.myMapView.showsUserLocation = YES;
    [self.myMapView setRegion:region animated:YES];

    [self dropPins];
}

-(void)dropPins {
    NSMutableArray *annotationArray = [[NSMutableArray alloc] init];

    CLLocationCoordinate2D location1 = CLLocationCoordinate2DMake(25.085130, -77.331428);
    MyAnnotation *annotation1 = [[MyAnnotation alloc] initWithCoordinates:location1 image:@"loc.png"];
    [annotationArray addObject:annotation1];
    [self.myMapView addAnnotations:annotationArray];

    [annotationArray removeAllObjects];
    CLLocationCoordinate2D location2 = CLLocationCoordinate2DMake(25.085130, -77.336428);
    MyAnnotation *annotation2 = [[MyAnnotation alloc] initWithCoordinates:location2 image:@"loc.png"];
    [annotationArray addObject:annotation2];
    [self.myMapView addAnnotations:annotationArray];
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    static NSString *identifier = @"MyLocation";
    if ([annotation isKindOfClass:[MyAnnotation class]])
    {
        MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[self.myMapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        if (annotationView == nil)
        {
            annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
        } else
        {
            annotationView.annotation = annotation;
        }

        annotationView.enabled = YES;
        annotationView.canShowCallout = NO;

        if([[(MyAnnotation *)annotationView.annotation image] isEqualToString:@"pin1.png"])
            annotationView.image = [UIImage imageNamed:@"loc.png"];

        if([[(MyAnnotation *)annotationView.annotation image] isEqualToString:@"pin2.png"])
            annotationView.image = [UIImage imageNamed:@"loc.png"];

        return annotationView;
    }
    return nil;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

＆＃13;

以下是MyAnnotation.m的代码

＆＃13;

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MyAnnotation : NSObject <MKAnnotation>

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy, readonly) NSString *image;


-(id)initWithCoordinates:(CLLocationCoordinate2D) paramCoordinates
                   image:(NSString *) paramImage;

@end

＆＃13;

MapView应用程序

2 个答案: