gistfile1.txt

#import "ViewController.h"

typedef NS_ENUM(NSInteger, HDDirection) {
    HDDirectionNorth = 0,
    HDDirectionSouth = 1,
    HDDirectionWest = 2,
    HDDirectionEast = 3,
};

@interface ViewController ()
@property (nonatomic, assign) HDDirection currentDirection;

@end



@implementation ViewController {
    float _yValue;
    float _xValue;
}


- (CGPoint)getDirection{
    if ((int)self.currentDirection == 4) {
        self.currentDirection = 0;
    }
    
    self.currentDirection += 1;
    
    CGPoint eastPoint = CGPointMake(1, 0);
    CGPoint westPoint = CGPointMake(-1, 0);
CGPoint northPoint = CGPointMake(0, 1);
    CGPoint southPoint = CGPointMake(0, -1);
    CGPoint noPoint = CGPointMake(0, 0);
    
    switch (self.currentDirection) {
        case HDDirectionEast:
            return eastPoint;
        case HDDirectionWest:
            return westPoint;
        case HDDirectionSouth:
            return southPoint;
        case HDDirectionNorth:
            return northPoint;
        default:
            return noPoint;
    }
}



-(void)changeDirection {
CGPoint point = [self getDirection];
    _xValue = point.x;
    _yValue = point.y;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    _yValue = 0.0f;
    _xValue = 0.0f;
    
    self.orb1 = [[customView1 alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100, 100)];
    self.orb1.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
    self.orb1.backgroundColor = [UIColor clearColor];
    [self.view addSubview:self.orb1];
    
    self.containerRect = CGRectInset(self.view.frame, 20, 20);
    

    
    [NSTimer scheduledTimerWithTimeInterval:0.0009
                                     target:self
                                   selector:@selector(engine)
                                   userInfo:nil
                                    repeats:YES];
    
    
    
    [NSTimer scheduledTimerWithTimeInterval:0.2
                                     target:self
                                   selector:@selector(changeDirection)
                                   userInfo:nil
                                    repeats:YES];
    
}


- (void)engine {
    
    CGRect tempFrame = self.orb1.frame;
    tempFrame.origin.x += _xValue;
    tempFrame.origin.y += _yValue;
    self.orb1.frame = tempFrame;
    
    if (!CGRectContainsPoint(self.containerRect, self.orb1.center)) {
    }


}




@end