Question

我在touchesMoved中通过UIBezierPath绘制一个形状。

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    secondPoint = firstPoint;
    firstPoint = [touch previousLocationInView:self];
    currentPoint = [touch locationInView:self];

    CGPoint mid1 = midPoint(firstPoint, secondPoint);
    CGPoint mid2 = midPoint(currentPoint, firstPoint);

    [bezierPath moveToPoint:mid1]; 
    [bezierPath addQuadCurveToPoint:mid2 controlPoint:firstPoint];

    [self setNeedsDisplay]; 
}

我想在closePath之后填充其中的RED颜色但不能。请帮忙！

- (void)drawRect:(CGRect)rect
{
    UIColor *fillColor = [UIColor redColor];
    [fillColor setFill];
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor setStroke];
    [bezierPath closePath];
    [bezierPath fill];
    [bezierPath stroke]; 
}

Answer 1

如果你有一个bezier路径存储在别处，这应该有效：

修改

查看您编辑的代码，发生的事情是，当您关闭正在绘制的路径时，您将获得一条线，而不是形状，因为您只有两点。

解决此问题的一种方法是在点移动时创建路径，但是笔划并填充该路径的副本。例如这是未经测试的代码，我直接在
中编写
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; secondPoint = firstPoint; firstPoint = [touch previousLocationInView:self]; currentPoint = [touch locationInView:self]; CGPoint mid1 = midPoint(firstPoint, secondPoint); CGPoint mid2 = midPoint(currentPoint, firstPoint); [bezierPath moveToPoint:mid1]; [bezierPath addQuadCurveToPoint:mid2 controlPoint:firstPoint]; // pathToDraw is an UIBezierPath * declared in your class pathToDraw = [[UIBezierPath bezierPathWithCGPath:bezierPath.CGPath]; [self setNeedsDisplay]; }

然后您的绘图代码可以：

- (void)drawRect:(CGRect)rect { UIColor *fillColor = [UIColor redColor]; [fillColor setFill]; UIColor *strokeColor = [UIColor blueColor]; [strokeColor setStroke]; // This closes the copy of your drawing path. [pathToDraw closePath]; // Stroke the path after filling it so that you can see the outline [pathToDraw fill]; // this will fill a closed path [pathToDraw stroke]; // this will stroke the outline of the path. }

有一些整理可以做touchesEnded，这可以提高性能，但你明白了。

Answer 2

你必须保留UIBezierPath的数组。试试这段代码，

 - (void)drawRect:(CGRect)rect
    {

        for(UIBezierPath *_path in pathArray){


         [_path fill];
        [_path stroke];
        }
    }

    #pragma mark - Touch Methods
    -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
        myPath=[[UIBezierPath alloc]init];
        myPath.lineWidth = currentSliderValue;

        UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
        [myPath moveToPoint:[mytouch locationInView:self]];
        [pathArray addObject:myPath];
    }
    -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
    {
        UITouch *mytouch=[[touches allObjects] objectAtIndex:0];
        [myPath addLineToPoint:[mytouch locationInView:self]];
        [self setNeedsDisplay];

    }

如何在UIBezierPath中填充颜色？

2 个答案: