Question

为什么我无法从mapview中删除我的注释？

我的代码：

（void）viewDidAppear：（BOOL）animated {   [super viewDidAppear：animated];   [self becomeFirstResponder];

NSMutableArray * annotations = [[NSMutableArray alloc] init];

NSString * path = [[NSBundle mainBundle] pathForResource：@＆＃34; data＆＃34; ofType：@＆＃34; plist中＆＃34;];    NSDictionary * dict = [NSDictionary dictionaryWithContentsOfFile：path];

if（[[NSUserDefaults standardUserDefaults] boolForKey：@＆＃34; blackKey＆＃34;]）   {       NSLog（@＆＃34; Black在＆＃34;）;

NSArray * ann = [dict objectForKey：@＆＃34; Category1＆＃34;];

for（int i = 0; i＆lt; [ann count]; i ++）{
NSString *coordinates = [[ann objectAtIndex:i] objectForKey:@"Coordinates"];

double realLatitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:1] doubleValue];
double realLongitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:0] doubleValue];

MyAnnotation *myAnnotation = [[MyAnnotation alloc] init];
CLLocationCoordinate2D theCoordinate;
theCoordinate.latitude = realLatitude;
theCoordinate.longitude = realLongitude;

myAnnotation.coordinate=CLLocationCoordinate2DMake(realLatitude,realLongitude);

myAnnotation.title = [[ann objectAtIndex:i] objectForKey:@"Name"];
myAnnotation.subtitle = [[ann objectAtIndex:i] objectForKey:@"Address"];
myAnnotation.icon = [[ann objectAtIndex:0] objectForKey:@"Icon"];

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blackKey"])
{
    NSLog(@"Black is on");
    [mapView addAnnotation:myAnnotation];
    [annotations addObject:myAnnotation];

}   else 
    {
        NSLog(@"Black is off");

        [self.mapView removeAnnotation:myAnnotation];


    } 

}
}

否则   {       //没做什么   }
 }

[self.mapView removeAnnotation:myAnnotation];对我不起作用

Answer 1

没有什么可以删除的。您创建注释，然后基于blackKey检查，您可以添加或删除它。但是当你删除它时，你从未在它之前添加它。

为什么我无法从mapview中删除我的注释？

1 个答案: