Question

i have one application it has mapview .

problem is that i want to show map. means right now when all data loaded then it show mapview. i want to show mapview before it loaded . how can i do this ?

Edit:

for show map i use this [self performSelector:@selector(methoname) withObject:nil afterDelay:0.02];

but by this other problem generate .problem is ,it show me two times activity indicator. any other thing ,like performselector but without activity indicator.

i dont want to show this thing.

Answer 1

You want to look at multithreading.

Basically, you should be retrieving your data in a background thread. If you do what you’re doing right now (loading everything in the main thread) the UI cannot be updated until everything is loaded.

So, do something like this:

-(void)viewDidLoad{
    mapView.hidden = NO;
    [self performSelectorInBackground:@selector(getExtraMapData)];
}

-(void)getExtraMapData{
    NSAutoReleasePool *pool = [[NSAutoreleasePool alloc] init];
    [self downloadMapData];
    [map addTheDataIDownloaded];//I've never used the mapView, 
                                // so I don't know it's methods.
    [pool release];
}

-(void)downloadMapData{
    NSURL *mapDataURL = [NSURL URLWithString:@"http://aURLWithInfoForMyMap.com"];
    NSData *mapData = [NSData dataWithContentsOfURL:mapDataURL];
}