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画圆圈

画圆圈

by 伍雪颖

CGPoint CGRectGetCenter(CGRect rect){
   
returnCGPointMake(CGRectGetMidX(rect),CGRectGetMidY(rect));
}
@interfaceViewController () {
   
CAShapeLayer *circleLayer;
}
@property (nonatomic,strong)CADisplayLink *timer;
@end
@implementation ViewController

- (
void)viewDidLoad {
    [
superviewDidLoad];
   
circleLayer = [CAShapeLayerlayer];
   
CGFloat radius =30.0;
   
UIBezierPath *path = [UIBezierPathbezierPathWithArcCenter:CGRectGetCenter(self.view.frame)
                                                       
radius:radius
                                                   
startAngle:-0.5 * M_PI
                                                     
endAngle:1.5 * M_PI
                                                    
clockwise:YES];
   
circleLayer.path = path.CGPath;
   
circleLayer.strokeColor = [UIColorredColor].CGColor;
   
circleLayer.lineWidth =3;
   
circleLayer.fillColor =nil;
   
circleLayer.contentsScale = [UIScreenmainScreen].scale;
    [
self.view.layeraddSublayer:circleLayer];
}

画圆圈