我是 iPhone 编程的新手,我不明白为什么 MKAnnotationView 没有显示我注释的标题。下面是用于在地图上显示它的代码。
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
NSLog(@"Entered didAddAnnotationViews");
MKAnnotationView *annotationView = [views objectAtIndex:0];
id <MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 250, 250);
[mv setRegion:region animated:YES];
}
这是我定义注释的地方:
MapPoint *mp = [[MapPoint alloc]
initWithCoordinate:[newLocation coordinate]
title:[locationTitleField text]];
[mapView addAnnotation:mp];
[mp release];
mp 是我创建的用于跟踪所有地图点的类:
#import "MapPoint.h"
@implementation MapPoint
@synthesize coordinate, title;
- (id)initWithCoordinate:(CLLocationCoordinate2D)c title:(NSString *)t
{
[super init];
coordinate = c;
[self setTitle:t];
return self;
}
- (void)dealloc
{
[title release];
[super dealloc];
}
@end
我是初学者,所以轻松一点,非常感谢所有帮助。
麦克风