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

Question

有人可以在这里请示范我如何使用UIBezierpath绘制一个点。我能够使用UIBezierpath绘制一条线，但是如果我移开手指并将其放回，然后移除画面上的任何东西。 由于

- (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抚摸的线段或曲线段。

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

这一次我用

- （空）handleTap：（UITapGestureRecognizer *）singleTap {// 在屏幕上画点

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

[self setNeedsDisplay]; 

}