CODEWITHSUNDEEP
objective-cfor-loop
user3166360
user3166360

Reputation:

For loop, waiting until external method has completed

I can't figure this out, I'm learning as I go. I have an array of cards that I want to move to a set location. This works fine except they all appear to move at once. I want a way to check if the first has finished moving before the second one does. Heres my code so far:

-(void)AIturn {  

int NuUnits = [p2Units count];
for (int q = 0; q < NuUnits; q++)
    {
    [self unselectUnit];
    selectedUnit = [p2Units objectAtIndex:q] ;
    CGPoint moveto = CGPointMake(184,556);
    TileData * td = [self getTileData:[self tileCoordForPosition:moveto]];
    //[selectedUnit doMarkedMovement:td ];
     [selectedUnit performSelector:@selector(doMarkedMovement:) withObject:td afterDelay:0.5];
   NSLog(@"%@ moved", selectedUnit);
    }

So, What Ideally I want is for it to know when doMarkedMovement has finished doing its stuff and then run through the loop again.

Thanks for any help you can provide.

Upvotes: 3

Views: 472

Answers (1)

Claudiu
Claudiu

Reputation: 229321

Have doMarkedMovement call a method when it's done - let's call it procNextMovement - and procNextMovement calls doMarkedMovement on the next element in the list.

Alternatively, if this works it would be much simpler - change the afterDelay parameter. So if each doMarkedMovement takes 0.2 seconds to complete, then your afterDelays will be: 0.5, 0.7, 0.9, 1.1, etc... This wouldn't be as precise as doing the callback method though.

Something like this:

- (void) AIturn {
    upTo = 0; //has to be an instance variable
    [self procNextTurn];
}

- (void) procNextTurn {
    if (upTo >= NuUnits) {
        //done
        return;
    }

    [self unselectUnit];
    selectedUnit = [p2Units objectAtIndex:upTo];
    CGPoint moveto = CGPointMake(184, 556);
    TileData * td = [self getTileData:[self tileCoordForPosition:moveto]];
    upTo += 1
    [selectedUnit performSelector:@selector(doMarkedMovement:) withObject:td afterDelay:0.5];
}

Then in the selectedUnit's function:

- (void) doMarkedMovement:(id td) {
    //regular code here
    //callback once movement is done, where `caller` is whatever the object above was
    [caller procNextTurn];
}

Upvotes: 1

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