ios - iOS上的MapView错误

Question

我在Xcode上使用MapView，并且一切正常，但是当我添加以下行时

mapView.delegate = self;

到ViewController.m，我得到了错误

从不兼容的类型'ViewController * const分配给'id '
__强大'

这是我的代码:

ViewController.m:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize mapView;

- (void)viewDidLoad
{
    [super viewDidLoad];
    mapView.showsUserLocation = YES;
    mapView.delegate = self; //The line I added that creates the error
    // Do any additional setup after loading the view, typically from a nib.
}

@end

ViewController.h

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

@interface ViewController : UIViewController {
    MKMapView *mapview;
}
@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@end

Answer 1

您需要声明您的类实现了MKMapViewDelegate方法。在您的ViewController.h头文件中，更改行

@interface ViewController : UIViewController {

至

@interface ViewController : UIViewController <MKMapViewDelegate> {