Animation using NSTimer and the position of the UIImageView frame - ios

Question

Hi and thanks in advance for any help and contribution :)
I am currently working on a personal project(some sort of a mmorpg) AND I'am stuck at the walking animation.
Until now I have made the map and implemented the A* pathfinder that returns a path array in C style.
What I am trying to do is to change the background image of an UIImageFrame and de/increment its x and y position depending on the values stored in an array.
The ideea was to change the background image and de/increase X or Y by 2px using an NSTimer, every 0,1s.
The NStimer will call the animation function 32 times before it is invalidated.
And here is the code for the 4 possible directions( N/S/W/E):
In the .h file:
#import <UIKit/UIKit.h>
int xMyCharacterFrame;
int yMyCharacterFrame;
#interface ViewController : UIViewController
{
int counterInMilisecondsForAnimation;
UIImageView *myCharacterFrame ;
}
#property (strong, nonatomic) NSTimer *timerForSouthMoving;
#property (strong, nonatomic) NSTimer *timerForNorthMoving;
#property (strong, nonatomic) NSTimer *timerForEstMoving;
#property (strong, nonatomic) NSTimer *timerForWestMoving;
-(void)southAnimation;
-(void)northAnimation;
-(void)estAnimation;
-(void)westAnimation;
#end
In the .m file:
- (void)viewDidLoad {
[super viewDidLoad];
myCharacterFrame = [[UIImageView alloc]init];
myCharacterFrame.frame = CGRectMake(xMyCharacterFrame, yMyCharacterFrame, 100, 100);
myCharacterFrame.image = [UIImage imageNamed:#"scientist_s0.png"];
}
When the game is started the xMyCharacterFrame are laoded form NSUserDefaults. ANd the recalculated depending on the user tap. The game is a 2d map based, with tiles of 64*64 px.
-(void)findPathForStart:(int)start andFinish:(int)stop{
//after the path is find using the self implemented A* pathfinder, the walking animation should use
the resulted path find array, that is two dimensional, first position Y and on the second the X.
On the fist 2d array of the path array I store the finish position, so in order to animate I need to read it in reverse.
int xWayOfMoving;
int yWayOfMoving;
for (int possitionInThePathArray = sizeOfPathArray - 1; possitionInThePathArray >= 0; possitionInThePathArray--) {
xWayOfMoving= pathArray[possitionInThePathArray-1][1] - pathArray[possitionInThePathArray][1];
yWayOfMoving= pathArray[possitionInThePathArray-1][0] - pathArray[possitionInThePathArray][0];
if (xWayOfMoving== 0 && yWayOfMoving== 1) {
//animate north
[timerForSouthMoving invalidate];
timerForSouthMoving = nil;
counterInMilisecondsForAnimation= 0;
timerPentruAnimatieDeplasare = [NSTimer scheduledTimerWithTimeInterval: 0.1
target: self
selector:#selector(northAnimation)
userInfo: nil
repeats:YES];
}else if (xWayOfMoving== 0 && yWayOfMoving== -1){
//animate south
[timerForNorthMoving invalidate];
timerForNorthMoving= nil;
counterInMilisecondsForAnimation= 0;
timerForNorthMoving= [NSTimer scheduledTimerWithTimeInterval: 0.1
target: self
selector:#selector(northAnimation)
userInfo: nil
repeats:YES];
}else if (xWayOfMoving== 1 && yWayOfMoving== 0){
// animate west
[timerForWestMovinginvalidate];
timerForWestMoving= nil;
counterInMilisecondsForAnimation= 0;
timerForWestMoving = [NSTimer scheduledTimerWithTimeInterval: 0.1
target: self
selector:#selector(northAnimation)
userInfo: nil
repeats:YES];
}else if (xWayOfMoving== -1 && yWayOfMoving == 0){
//animate est
[timerForEstMoving invalidate];
timerForEstMoving = nil;
counterInMilisecondsForAnimation= 0;
timerForEstMoving = [NSTimer scheduledTimerWithTimeInterval: 0.1
target: self
selector:#selector(northAnimation)
userInfo: nil
repeats:YES];
}
}
}
One of the 4 functions for the walking animation:
-(void)northAnimation{
if (counterInMilisecondsForAnimation< 33) {
if (counterCharacterImageSouth == 11) {
counterCharacterImageSouth = 0;}
myCharacterFrame.frame = CGRectMake(xMyCharacterFrame, yMyCharacterFrame, 100, 100);
myCharacterFrame.image = [UIImage imageNamed:[NSString stringWithFormat:#"scientist_s%d.png", counterCharacterImageSouth]];
yMyCharacterFrame = yMyCharacterFrame - 2;
counterCharacterImageSouth++;
counterInMilisecondsForAnimation++;
}
else{
[timerForSouthMoving invalidate];
}
}