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    <p>Here's how I do it - I use the face center and the angle to compute the x,y position of the endpoints of the hands, drawing is simple from there. Here's a complete clock face class. It's a subclass of UIView. Set it's time property every second and it works like a charm...</p> <pre><code>// // ClockFace.h // #import &lt;UIKit/UIKit.h&gt; @interface ClockFace : UIView @property (strong,nonatomic) NSDate *time; @end // ClockFace.m #import "ClockFace.h" @interface ClockFace () @property(assign,nonatomic) CGPoint boundsCenter; @property(assign,nonatomic) NSInteger seconds; @property(assign,nonatomic) NSInteger minutes; @property(assign,nonatomic) NSInteger hours; @end @implementation ClockFace @synthesize time=_time; @synthesize boundsCenter=_boundsCenter; - (id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if (self) { _boundsCenter = CGPointMake(self.bounds.size.width/2.0, self.bounds.size.height/2.0); } return self; } - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code _boundsCenter = CGPointMake(self.bounds.size.width/2.0, self.bounds.size.height/2.0); } return self; } - (CGPoint)secondsHandPosition { float secondsAsRadians = (float)self.seconds / 60.0 * 2.0 * M_PI - M_PI_2; float handRadius = self.frame.size.width / 2.4; return CGPointMake(handRadius*cosf(secondsAsRadians)+self.boundsCenter.x, handRadius*sinf(secondsAsRadians)+self.boundsCenter.y); } - (CGPoint)minutesHandPosition { float minutesAsRadians = (float)self.minutes / 60.0 * 2.0 * M_PI - M_PI_2; float handRadius = self.frame.size.width / 2.2; return CGPointMake(handRadius*cosf(minutesAsRadians)+self.boundsCenter.x, handRadius*sinf(minutesAsRadians)+self.boundsCenter.y); } - (CGPoint)hoursHandPosition { float hoursAsRadians = (float)self.hours / 12.0 * 2.0 * M_PI - M_PI_2; float handRadius = self.frame.size.width / 3.8; return CGPointMake(handRadius*cosf(hoursAsRadians)+self.boundsCenter.x, handRadius*sinf(hoursAsRadians)+self.boundsCenter.y); } // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGFloat zClear[4] = {1.0,1.0,1.0,0.0}; CGContextSetFillColor(context, zClear); CGContextFillRect(context, rect); CGRect face = CGRectInset(rect, 1.0, 1.0); CGContextSetLineWidth(context, 1.0); CGContextAddEllipseInRect(context, face); CGContextStrokePath(context); CGRect center = CGRectMake(self.boundsCenter.x-2.0, self.boundsCenter.y-2.0, 4.0, 4.0); CGContextAddEllipseInRect(context, center); CGContextStrokePath(context); CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f}; CGPoint secondsHandPosition = [self secondsHandPosition]; CGContextSetStrokeColor(context, red); CGContextBeginPath(context); CGContextMoveToPoint(context, self.boundsCenter.x, self.boundsCenter.y); CGContextAddLineToPoint(context, secondsHandPosition.x, secondsHandPosition.y); CGContextStrokePath(context); CGFloat black[4] = {0.0f, 0.0f, 0.0f, 1.0f}; CGPoint minutesHandPosition = [self minutesHandPosition]; CGContextSetStrokeColor(context, black); CGContextBeginPath(context); CGContextMoveToPoint(context, self.boundsCenter.x, self.boundsCenter.y); CGContextAddLineToPoint(context, minutesHandPosition.x, minutesHandPosition.y); CGContextStrokePath(context); CGPoint hoursHandPosition = [self hoursHandPosition]; CGContextSetStrokeColor(context, black); CGContextBeginPath(context); CGContextMoveToPoint(context, self.boundsCenter.x, self.boundsCenter.y); CGContextAddLineToPoint(context, hoursHandPosition.x, hoursHandPosition.y); CGContextStrokePath(context); } - (void)setTime:(NSDate *)time { _time = time; static NSCalendar *gregorian; if (!gregorian) gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *weekdayComponents = [gregorian components:(NSDayCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:time]; self.hours = [weekdayComponents hour]; if (self.hours &gt; 12) self.hours -= 12; self.minutes = [weekdayComponents minute]; self.seconds = [weekdayComponents second]; [self setNeedsDisplay]; } @end </code></pre> <p>To use this in a view controller, create a property:</p> <pre><code>#import "ClockFace.h" // ... @property(strong, non atomic) ClockFace *clockFace; </code></pre> <p>In view did load (or in storyboard if you know how to add custom views):</p> <pre><code>self.clockFace = [[ClockFace alloc] initWithFrame:CGRectMake(10, 10, 300, 300)]; </code></pre> <p>Whenever you want the clock to run, setup a timer:</p> <pre><code>[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired:) userInfo:nil repeats:NO]; </code></pre> <p>When the timer fires, tell the clock what time it is:</p> <pre><code>- (void)timerFired:(NSTimer *)timer { self.clockFace.time = [NSDate date]; } </code></pre>
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    1. POHow to rotate the hands of clock for the 24 hour clock?
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    1. COIt will be nice if you provide the source code project. I don't know how to call this.
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    2. COI missed your reply comment somehow. Sorry. I've edited to add code demonstrating how to call. Hope that makes sense.
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