Set Time Clicking on Dial - ios

Question

I am working on an alarm app in which I have to show an analogue clock. The functionality is to set time by clicking on the circumference of the circle displayed as the clock dial.
I have succesfully done this too. But the issue comes at 6 O'Clock or 30 min. The angle comes out to be nan for that which makes my smooth clock totally abrupt.
Here is the code.
myPath1 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(5, 5, 244, 244)];
[myPath1 closePath];
[myPath1 setLineWidth:20];
// Draw a shape Layer with Triangle Path
CAShapeLayer *shapeLayer1 = [CAShapeLayer layer];
shapeLayer1.fillColor = [UIColor clearColor].CGColor;
shapeLayer1.strokeColor = [UIColor clearColor].CGColor;
shapeLayer1.lineWidth = 20;
shapeLayer1.path = myPath1.CGPath;
// Add it to your view
[circleView.layer addSublayer:shapeLayer1];
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:circleView];
if([self containsPointOnStroke:currentPoint onPath:myPath1])
{
[self calculateAngle:currentPoint];
}
}
- (BOOL)containsPointOnStroke:(CGPoint)point onPath:(UIBezierPath *)path
{
CGPathRef cgPath = path.CGPath;
CGPathRef strokedPath = CGPathCreateCopyByStrokingPath(cgPath, NULL, 10,
kCGLineCapRound, kCGLineJoinRound, 1);
BOOL pointIsNearPath = CGPathContainsPoint(strokedPath, NULL, point, NO);
CGPathRelease(strokedPath);
return pointIsNearPath;
}
//---- calculate angle from the point of touch taking center as the reference ----//
- (void) calculateAngle : (CGPoint)currentPoint
{
double distance = sqrt(pow((currentPoint.x - 127), 2.0) + pow((currentPoint.y - 5), 2.0));
float val = ((2 * 14884) - powf((distance), 2)) / (2 * 14884);
float angleVal = acosf(val) * 180/M_PI;
float timeval = angleVal;
//NSLog(#"angleVal : %f timeVal : %.2f", angleVal, timeval);
if (isnan(angleVal))
{
// if the value of the angle val is infinite
if(check == 0)
[hourBtn setTitle:#"06" forState:UIControlStateNormal];
else
[minBtn setTitle:#"30" forState:UIControlStateNormal];
}
else
{
if(check == 0)
{
if (currentPoint.x >= 127)
[hourBtn setTitle:[self getHour:timeval reverseTIme:NO] forState:UIControlStateNormal];
else
[hourBtn setTitle:[self getHour:timeval reverseTIme:YES] forState:UIControlStateNormal];
}
else
{
if (currentPoint.x >= 127)
[minBtn setTitle:[self getMin:timeval reverseTIme:NO] forState:UIControlStateNormal];
else
[minBtn setTitle:[self getMin:timeval reverseTIme:YES] forState:UIControlStateNormal];
}
}
[timeLbl setText:[NSString stringWithFormat:#"%02d:%02d",[hourBtn.titleLabel.text intValue], [minBtn.titleLabel.text intValue]]];
}
//---- get the hour time from the angle ----//
- (NSString *) getHour :(float) angle reverseTIme:(BOOL) reverseCheck
{
int minuteCount = angle * 2;
int quo = minuteCount / 60;
int temp = quo;
if(quo == 0)
quo = 12;
NSString *timeStr = [NSString stringWithFormat:#"%02d", quo];
quo = temp;
if (reverseCheck)
{
int revQuo = 11 - quo;
if(revQuo == 0)
revQuo = 12;
timeStr = [NSString stringWithFormat:#"%02d", revQuo];
}
return timeStr;
}
// get the min time from the angle
- (NSString *) getMin :(float) angle reverseTIme:(BOOL) reverseCheck
{
int minuteCount = angle;
int rem = minuteCount / 6;
NSString *timeStr = [NSString stringWithFormat:#"%02d", rem];
if (reverseCheck)
{
int revRem = 60 - rem;
if(revRem == 60)
revRem = 0;
timeStr = [NSString stringWithFormat:#"%02d", revRem];
}
//NSLog(#"timeStr : %#", timeStr);
return timeStr;
}