iphone – 为MKMapView优化代码 – 大量注释

问题是当所有引脚加载时,用户被迫等待一分钟左右.一旦所有800个引脚都在地图上,应用程序也会变得迟钝.

任何人都可以建议我如何改进下面的代码？

谢谢.

#import "MapView.h"
#import "MapPlaceObject.h"


@implementation MapView
@synthesize mapViewLink,mapLOCATIOns,detail,FailedLoad;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundLeorNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundLeorNil];
if (self) {
    // Custom initialization
}
return self;
}

-(void)addPins
{

for (MapPlaceObject * info in mapLOCATIOns) {


    double latitude = info.longitude;
    double longitude = info.latitude;

    NSString * name = info.name;
    NSString * addressline = info.addressOne;
    NSString * postcode = info.postCode;

    NSString * addresscomma = [addressline StringByAppendingString:@","];
    NSString * address = [addresscomma StringByAppendingString:postcode];

    CLLOCATIOnCoordinate2D coordinate;
    coordinate.latitude = latitude;
    coordinate.longitude = longitude;
    MyLOCATIOn *Annotation = [[[MyLOCATIOn alloc] initWithName:name address:address coordinate:coordinate] autorelease];


    [mapViewLink addAnnotation:Annotation];

}
}

- (void)showLinks : (id)sender {


if (UI_user_iNTERFACE_I@L_714_7@m() == UIUserInterfaceI@L_714_7@mPad) {
    detail = [[DetailViewController alloc] initWithNibName:@"DetailViewController-iPad" bundle:nil];
} 

else if (!detail) {

    NSLog(@"Detail is None");

    detail = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil]; 

}

int uniquEID = ((UIButton *)sender).tag;

//PlaceObject *info = [mapLOCATIOns objectATindex:uniquEID];

detail.UniquEID = uniquEID;
detail.hidesBottomBarWhenPushed = YES;

[self.navigationController pushViewController:detail animated:YES];

self.detail = nil;

[detail release];

}

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) Annotation{

if (Annotation == mapView.userLOCATIOn){
    return nil; //default to blue dot
}    

MKPinAnnotationView *AnnView=[[MKPinAnnotationView alloc] initWithAnnotation:Annotation reusEIDentifier:@"currentloc"];
AnnView.pinColor = MKPinAnnotationColorRed;

nameSaved = Annotation.title;

for (PlaceObject * info in mapLOCATIOns) {

    if (info.name == nameSaved) {

        savEID = info.UniquEID;

    }
}

UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
advertButton.frame = CGRectMake(0,23,23);
advertButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
advertButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

[advertButton addTarget:self action:@SELEctor(showLinks:) forControlEvents:UIControlEventTouchUpInside];

advertButton.tag = savEID;

AnnView.rightCalloutAccessoryView = advertButton;

AnnView.animatesDrop=TRUE;
AnnView.canShowCallout = YES;
AnnView.calloutOffset = CGPointMake(-5,5);
return AnnView;

}

- (void)dealloc
{
[mapViewLink release];
[mapLOCATIOns release];
[detail release];
self.FailedLoad = nil;
[FailedLoad release];
[super dealloc];
}

- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data,images,etc that aren't in use.
}

- (void)viewWillAppear:(BOOL)animated {

if (firstTimE) {

    CLLOCATIOnCoordinate2D zoomLOCATIOn;

    zoomLOCATIOn.latitude = 51.50801;
    zoomLOCATIOn.longitude = -0.12789;

    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLOCATIOn,15*METERS_PER_MILE,15*METERS_PER_MILE);

    MKCoordinateRegion adjustedRegion = [mapViewLink regionThatFits:viewRegion];                

    [mapViewLink setRegion:adjustedRegion animated:YES];  

    firstTime = NO;

}    
}

- (void)viewDidLoad
{
[super viewDidLoad];

firstTime = YES;

FailedLoad = [[NSMutableArray alloc]init];

self.mapLOCATIOns = [BluePlaqueDatabase database].mapInfo;

[self addPins];
}

- (void)viewDidUnload
{
[mapViewLink release];
mapViewLink = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}