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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];
}
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
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