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[操作系统]iOS:绘图

1、UIBezierPath(贝塞尔曲线)

  1-1)、在重写 drawRect: 方法里使用

    使用不难,看 UIBezierPath.h 基本都会用,值得注意的是,颜色设置如下:

[[UIColor redColor]set];

    下面是学习过程中的代码

- (void)drawRect:(CGRect)rect{ //矩形 UIBezierPath *path1 = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 50, 50)]; [[UIColor grayColor]set]; [path1 stroke]; //内切圆 UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(100, 20, 50, 50)]; [[UIColor blueColor]set]; [path2 fill]; [path2 stroke]; //切4个圆角 UIBezierPath *path3 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(200, 20, 50, 50) cornerRadius:15.0]; [[UIColor greenColor]set]; [path3 stroke]; //切1-4个圆角(最后一个参数cornerRadii,好像就size.width有效果?) UIBezierPath *path4 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(300, 20, 50, 50) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(15.0, 35.0)]; [[UIColor whiteColor]set]; [path4 stroke]; //弧形 UIBezierPath *path5 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(50, 120) radius:25.0 startAngle:M_PI endAngle:M_PI/4 clockwise:YES]; [[UIColor yellowColor]set]; [path5 stroke]; //画直线 UIBezierPath *path6 = [UIBezierPath bezierPath]; [path6 setLineWidth:3.0]; [[UIColor redColor]set]; [path6 moveToPoint:CGPointMake(100, 100)]; [path6 addLineToPoint:CGPointMake(150, 100)]; [path6 addLineToPoint:CGPointMake(150, 150)]; [path6 addLineToPoint:CGPointMake(100, 150)]; [path6 addLineToPoint:CGPointMake(100, 100)]; [path6 addLineToPoint:CGPointMake(200, 125)]; [path6 addLineToPoint:CGPointMake(150, 150)]; [path6 closePath]; path6.usesEvenOddFillRule = YES; [path6 fill]; [path6 stroke];  //贝塞尔曲线 UIBezierPath *path7 = [UIBezierPath bezierPath]; [path7 setLineWidth:5.0]; [[UIColor orangeColor]set]; [path7 moveToPoint:CGPointMake(200, 100)]; [path7 addCurveToPoint:CGPointMake(300, 100) controlPoint1:CGPointMake(250, 150) controlPoint2:CGPointMake(275, 50)]; [path7 stroke];  //贝塞尔曲线 UIBezierPath *path8 = [UIBezierPath bezierPath]; [path8 setLineWidth:5.0]; [[UIColor purpleColor]set]; [path8 moveToPoint:CGPointMake(200, 150)]; [path8 addQuadCurveToPoint:CGPointMake(300, 150) controlPoint:CGPointMake(250, 200)]; [path8 stroke];  //带圆心到起始角度线段的弧形 UIBezierPath *path9 = [UIBezierPath bezierPath]; [path9 setLineWidth:5.0]; [[UIColor brownColor]set]; [path9 moveToPoint:CGPointMake(50, 200)]; [path9 addArcWithCenter:CGPointMake(50, 200) radius:25.0 startAngle:0.0 endAngle:M_PI clockwise:YES]; [path9 stroke];  //虚线 UIBezierPath *path10 = [UIBezierPath bezierPath]; [path10 setLineWidth:5.0]; [[UIColor whiteColor]set]; [path10 moveToPoint:CGPointMake(10, 300)]; [path10 addLineToPoint:CGPointMake(SCREEN_WIDTH - 10, 300)]; CGFloat lineDash[] = {10.0,2.0,5.0,5.0}; //奇数实线,偶数虚线,phase起始偏移 [path10 setLineDash:lineDash count:4 phase:0]; [path10 stroke];}

 

 

  1-2)、在普通方法里使用,需要画布。配合 CAShapeLayer 。

    注意:1、设置线宽、颜色、填充等,都由 CAShapeLayer 完成,UIBezierPath 只完成路径的绘画。

       2、CAShapeLayer的大小,可以设成屏幕的大小 SCREEN.BOUNDS。UIBezierPath画完线条后,自动剪裁,如果没闭合,会自动连接起点、终点剪裁。

    

    下面是学习过程中的代码

- (void)drawTest{ //矩形 CGRect rect1 = {20, 20, 50, 50}; UIBezierPath *path1 = [UIBezierPath bezierPathWithRect:rect1];  CAShapeLayer *shapeLayer1 = [[CAShapeLayer alloc]init]; shapeLayer1.position = self.layer.position; shapeLayer1.bounds = self.layer.bounds; shapeLayer1.path = path1.CGPath; shapeLayer1.fillColor = [UIColor grayColor].CGColor; [self.layer addSublayer:shapeLayer1]; //内切圆 CGRect rect2 = {100, 20, 50, 50}; UIBezierPath *path2 = [UIBezierPath bezierPathWithOvalInRect:rect2];  CAShapeLayer *shapeLayer2 = [[CAShapeLayer alloc]init]; shapeLayer2.position = self.layer.position; shapeLayer2.bounds = self.layer.bounds; shapeLayer2.path = path2.CGPath; shapeLayer2.fillColor = [UIColor blueColor].CGColor; shapeLayer2.strokeColor = [UIColor orangeColor].CGColor; shapeLayer2.strokeStart = 0.0; shapeLayer2.strokeEnd = 0.7; shapeLayer2.lineWidth = 3.0; [self.layer addSublayer:shapeLayer2];  //画线 UIBezierPath *path3 = [UIBezierPath bezierPath]; [path3 moveToPoint:CGPointMake(100, 100)]; [path3 addLineToPoint:CGPointMake(150, 100)]; [path3 addLineToPoint:CGPointMake(150, 150)]; [path3 addLineToPoint:CGPointMake(100, 150)]; [path3 addLineToPoint:CGPointMake(100, 100)]; [path3 addLineToPoint:CGPointMake(200, 125)]; [path3 addLineToPoint:CGPointMake(150, 150)];  CAShapeLayer *shapeLayer3 = [[CAShapeLayer alloc]init]; shapeLayer3.position = self.layer.position; shapeLayer3.bounds = self.layer.bounds; shapeLayer3.path = path3.CGPath; shapeLayer3.fillColor = [UIColor redColor].CGColor; shapeLayer3.strokeColor = [UIColor orangeColor].CGColor; shapeLayer3.lineWidth = 3.0; shapeLayer3.fillRule = kCAFillRuleEvenOdd; [self.layer addSublayer:shapeLayer3];}