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मेरे पास मेरे ऐप में एक मॉडल दृश्य है जो UIMapView प्रदर्शित करता है। इसके बाद मैं इस मानचित्र दृश्य (नीचे कोड) में बड़ी संख्या में एनोटेशन (800 से अधिक) जोड़ता हूं।MKMapView के लिए अनुकूलन कोड - एनोटेशन की बड़ी संख्या
समस्या यह है कि उपयोगकर्ता को एक मिनट या तो प्रतीक्षा करने के लिए मजबूर होना पड़ता है जबकि सभी पिन लोड होते हैं। मानचित्र पर सभी 800 पिन होने पर भी ऐप आलसी हो जाता है।
क्या कोई सुझाव दे सकता है कि मैं नीचे अपना कोड कैसे सुधार सकता हूं?
धन्यवाद।
#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_IDIOM() == UIUserInterfaceIdiomPad) {
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, 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;
}