Question

有人可以告诉我如何使用UIBezierpath绘制单个点。我可以使用UIBezier路径绘制一条线，但是如果我移开我的手指并将其放回去，然后移除屏幕上的任何内容。感谢

- (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

您的路径不包含任何要描边的线段或曲线段。

请改为尝试：

- (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

这个我用的是

- （void）handleTap：（UITapGestureRecognizer *）singleTap { //在屏幕上绘制点
CGPoint tapPoint = [singleTap locationInView:self];
[bezierPath_ moveToPoint:tapPoint];
[bezierPath_ addLineToPoint:tapPoint];

[self setNeedsDisplay]; 
}

如何使用UIBezierpath在touchesEnded上在屏幕上绘制一个点

2 个答案: