-
(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint p = [touch locationInView:self];
    NSValue *v = [NSValue valueWithCGPoint:p]; //CGPoint 

 

转为 对象

    NSMutableArray *points = [allPoints lastObject];
    [points addObject:v];
    //驱动画笔（drawRect 方法）
    [self setNeedsDisplay];
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{}

@end

效果：

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