ios - 如何使用 UIBezierpath 在 touchesEnded 的屏幕上绘制一个点

Question

有人可以告诉我如何使用 UIBezierpath 绘制一个点吗？我可以使用 UIBezierpath 画一条线，但是如果我移开手指并将其放回原处，然后再移开，屏幕上什么也不会画出来。

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint p = [touch locationInView:self];
    [pPath moveToPoint:p];
    [pPath stroke];
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect
{
     [pPath stroke];
}

Answer 1

您的路径不包括任何要描边的线段或曲线段。

试试这个：

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint p = [touches.anyObject locationInView:self];
    static CGFloat const kRadius = 3;
    CGRect rect = CGRectMake(p.x - kRadius, p.y - kRadius, 2 * kRadius, 2 * kRadius);
    pPath = [UIBezierPath bezierPathWithOvalInRect:rect];
    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect {
    [[UIColor blackColor] setFill];
    [pPath fill];
}

Answer 2

我使用了这段代码：

 -(void)handleTap:(UITapGestureRecognizer*)singleTap { 
     //draw dot on screen

     CGPoint tapPoint = [singleTap locationInView:self];
     [bezierPath_ moveToPoint:tapPoint];
     [bezierPath_ addLineToPoint:tapPoint];

     [self setNeedsDisplay]; 
}