RisingSunView.m

//
//  SunshineLayerView.m
//  Sunshine
//

#import "SunshineLayerView.h"

@implementation SunshineLayerView

@synthesize color = _color;
@synthesize count = _count;

- (NSUInteger)count {
    if (!_count) _count = 16;
    return _count;
}

- (void)setCount:(NSUInteger)count {
    _count = count;
    [self setNeedsDisplay];
}

- (UIColor *)color {
    if (!_color) _color = [[UIColor redColor] colorWithAlphaComponent:0.25];
    return _color;
}

- (void)setColor:(UIColor *)color {
    _color = [color colorWithAlphaComponent:0.25];
    [self setNeedsDisplay];
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self setup];
    }
    return self;
}

- (void)setup {
    self.backgroundColor = nil;
    self.opaque = NO;
    self.contentMode = UIViewContentModeRedraw;
    [self animate];
}


- (void)animate {
    [self.layer removeAllAnimations];
    [UIView animateWithDuration:4.0
                          delay:0.0
                        options:UIViewAnimationOptionBeginFromCurrentState+UIViewAnimationOptionRepeat+UIViewAnimationOptionCurveLinear+UIViewAnimationOptionAllowAnimatedContent+UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         self.transform = CGAffineTransformMakeRotation(-M_PI);
                     }
                     completion:nil];
}

- (void)awakeFromNib {
    [self setup];
}

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
    UIBezierPath *path =[UIBezierPath bezierPath];
    CGPoint center = CGPointMake(rect.size.width / 2.0, rect.size.height / 2.0);
    CGFloat radius = sqrt(pow(center.x, 2) + pow(center.y, 2));
    CGFloat angle = M_PI / self.count;
    [self.color set];
    [path moveToPoint:center];
    for (NSUInteger i = 0; i < self.count; i++) {
        [path addArcWithCenter:center radius:radius startAngle:2*i*angle endAngle:(2*i+1)*angle clockwise:YES];
        [path addLineToPoint:center];
        [path closePath];
        [path fill];
    }
}

@end