How can I make the line turn? - ios

Question

I drew the line that turn like clock.
This is the line's moving of my ideal
but my code moves like this
How can I make a line like the second picture's line?
Here is my code
LineLayer.m
- (void)drawInContext:(CGContextRef)ctx
{
CGMutablePathRef path = CGPathCreateMutable();
CGPoint points[] = {
CGPointMake(160, 220),
CGPointMake(160, 120),
};
int numPoints = sizeof(points)/sizeof(points[0]);
CGPathAddLines(path, NULL, points, numPoints);
CGContextAddPath(ctx, path);
CGPathRelease(path);
UIColor *lineColor = [UIColor colorWithWhite:1.0 alpha:1.0];
CGContextSetStrokeColorWithColor(ctx, lineColor.CGColor);
CGContextSetLineWidth(ctx, 5.0);
CGContextDrawPath(ctx, kCGPathStroke);
}
ViewController.h
- (void)setup
{
LineLayer *linelayer = [LineLayer layer];
linelayer.frame = CGRectInset(self.view.bounds,0.0,0.0);
linelayer.anchorPoint = CGPointMake(0.5, 0.5);
[self.view.layer addSublayer:linelayer];
[linelayer setNeedsDisplay];
CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:#"transform.rotation"];
animation.toValue = [NSNumber numberWithFloat:M_PI / 2.0];
animation.duration = 0.5;
animation.repeatCount = MAXFLOAT;
animation.cumulative = YES;
[linelayer addAnimation:animation forKey:#"ImageViewRotation"];
}

Answer 1

you need a clock seconds needle or something like that??
#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)
NSTimer *timer1;//global declaration
CALayer *layerLine;//global declaration
in viewDidLoad()
layerLine = [CALayer layer];
[layerLine setFrame:CGRectMake(0, 0,2, 90)];
[layerLine setBackgroundColor:[UIColor yellowColor].CGColor];
[self.view.layer addSublayer:layerLine];
CGPoint centerPoint = CGPointMake([[UIScreen mainScreen] bounds].size.width/2, ([[UIScreen mainScreen] bounds].size.height/2)-(layerLine.frame.size.height/4));
layerLine.anchorPoint = CGPointMake(0, 0);
layerLine.position = centerPoint;
layerLine.transform = CATransform3DMakeRotation(M_PI_2*2, 0.0, 0.0, 1.0);
if (!timer)
{
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(onTickTick) userInfo:nil repeats:YES];
}
timer invoking method
-(void)onTickTick
{
static int i = 180;
if (i==540)//if u change the value for i, it may affect this condition
{
i=180;
}
i=i+6;//u can replace 6 with 30 or any other value as u require
layerLine.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(i), 0.0, 0.0, 1);
}