如何使用UIBezierpath在touchesEnded上在屏幕上繪制一個點

Question

有人可以告訴我如何使用UIBezierpath繪制一個點嗎？ 我可以使用UIBezier路徑繪制一條線，但是如果我移開手指並將其放回去，則移除屏幕上的任何內容。

- (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

您的路徑不包括要描邊的任何線段或曲線段。

試試這個：

- (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

我用過這段代碼：

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

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

     [self setNeedsDisplay]; 
}