Question

我有一个或多或少有弧形的BezierPath，我希望用户能够在弧内点击（它可能是一个更清晰的门）但不是在弧线上。但我无法做到这一点，它就像弧内的空间也是BezierPath的一部分，但唯一的是它是透明的。

创建BezierPath的代码如下：

- (UIImageView*)drawBezierPath {
    //// Bezier Drawing
    UIBezierPath* bezierPath = [UIBezierPath bezierPath];
    [bezierPath moveToPoint: CGPointMake(55.5, 643.5)];
    [bezierPath addLineToPoint: CGPointMake(55.5, 417)];
    [bezierPath addLineToPoint: CGPointMake(63, 399)];
    [bezierPath addLineToPoint: CGPointMake(69.5, 381.5)];
    [bezierPath addLineToPoint: CGPointMake(79, 363.5)];
    [bezierPath addLineToPoint: CGPointMake(91, 346)];
    [bezierPath addLineToPoint: CGPointMake(102, 331)];
    [bezierPath addLineToPoint: CGPointMake(114.5, 314.5)];
    [bezierPath addLineToPoint: CGPointMake(127.5, 301.5)];
    [bezierPath addLineToPoint: CGPointMake(142.5, 286)];
    [bezierPath addLineToPoint: CGPointMake(156.5, 273.5)];
    [bezierPath addLineToPoint: CGPointMake(171, 260)];
    [bezierPath addLineToPoint: CGPointMake(189.5, 247.5)];
    [bezierPath addLineToPoint: CGPointMake(207.5, 234.5)];
    [bezierPath addLineToPoint: CGPointMake(229.5, 222.5)];
    [bezierPath addLineToPoint: CGPointMake(250, 211)];
    [bezierPath addLineToPoint: CGPointMake(272.5, 202)];
    [bezierPath addLineToPoint: CGPointMake(295.5, 194)];
    [bezierPath addLineToPoint: CGPointMake(321, 186.5)];
    [bezierPath addLineToPoint: CGPointMake(349, 180.5)];
    [bezierPath addLineToPoint: CGPointMake(375, 179)];
    [bezierPath addLineToPoint: CGPointMake(398, 177.5)];
    [bezierPath addLineToPoint: CGPointMake(424.5, 177.5)];
    [bezierPath addLineToPoint: CGPointMake(448.5, 180.5)];
    [bezierPath addLineToPoint: CGPointMake(473, 184.5)];
    [bezierPath addLineToPoint: CGPointMake(498.5, 192)];
    [bezierPath addLineToPoint: CGPointMake(521.5, 200)];
    [bezierPath addLineToPoint: CGPointMake(544.5, 209.5)];
    [bezierPath addLineToPoint: CGPointMake(565.5, 220)];
    [bezierPath addLineToPoint: CGPointMake(584, 231)];
    [bezierPath addLineToPoint: CGPointMake(603, 244)];
    [bezierPath addLineToPoint: CGPointMake(623.5, 259)];
    [bezierPath addLineToPoint: CGPointMake(640.5, 274)];
    [bezierPath addLineToPoint: CGPointMake(657.5, 290.5)];
    [bezierPath addLineToPoint: CGPointMake(673, 308)];
    [bezierPath addLineToPoint: CGPointMake(688.5, 327)];
    [bezierPath addLineToPoint: CGPointMake(702.5, 346.5)];
    [bezierPath addLineToPoint: CGPointMake(715, 368)];
    [bezierPath addLineToPoint: CGPointMake(727, 392.5)];
    [bezierPath addLineToPoint: CGPointMake(736.5, 414.5)];
    [bezierPath addLineToPoint: CGPointMake(736.5, 644)];
    [bezierPath addLineToPoint: CGPointMake(789.5, 644.5)];
    [bezierPath addLineToPoint: CGPointMake(789.5, 1)];
    [bezierPath addLineToPoint: CGPointMake(2.5, 1)];
    [bezierPath addLineToPoint: CGPointMake(2, 645)];
    [bezierPath addLineToPoint: CGPointMake(55.5, 643.5)];
    [bezierPath closePath];
    [[UIColor blackColor] setFill];
    [bezierPath fill];
    [[UIColor blackColor] setStroke];
    bezierPath.lineWidth = 1;
    [bezierPath stroke];

    UIGraphicsBeginImageContext(CGSizeMake(800, 800));

    //this gets the graphic context
    CGContextRef context = UIGraphicsGetCurrentContext();

    //you can stroke and/or fill
    CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
    CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
    [bezierPath fill];
    [bezierPath stroke];

    //now get the image from the context
    UIImage *bezierImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    UIImageView *bezierImageView = [[UIImageView alloc]initWithImage:bezierImage];
    bezierImageView.alpha = 0;
    bezierImageView.frame = CGRectMake(115, 92, bezierImageView.frame.size.width, bezierImageView.frame.size.height);
    return bezierImageView;
}

在这个方法中，我创建了bezierPath并将其保存在UIImageView中，以便将其添加到另一个视图中。

我认为bezierPath用于绘制奇怪的形式并仅占用该形式的空间，但现在我不知道该怎么想！

有关于此的任何想法？谢谢！

Answer 1

第1步：在项目中添加QuartzCore.Framwork

第2步：{。1}中的#import <QuartzCore/QuartzCore.h>

第3步：在.h文件中定义变量UIBezierPath *path;

第4步：在viewDidLoad方法中绘制Trianble形状

path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(100, 100)];
[path addLineToPoint:CGPointMake(50, 200)];
[path addLineToPoint:CGPointMake(150, 200)];
[path closePath];
[path setLineWidth:2.0f];

// Draw a shape Layer with Triangle Path
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.fillColor   = [UIColor redColor].CGColor;
shapeLayer.strokeColor = [UIColor yellowColor].CGColor;
shapeLayer.lineWidth   = 2;
shapeLayer.path = path.CGPath;

// Add it to your view
[self.view.layer addSublayer:shapeLayer];

步骤5：实施以下触摸方法以检测触摸视图＆amp;形状

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];

    CGPoint currentPoint = [touch locationInView:self.view];
    if([path containsPoint:currentPoint])
    {
        NSLog(@"its Inside Triangle Path");
    }
    else
    {
        NSLog(@"OutSide Shape");
    }
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self.view];
    if([path containsPoint:currentPoint])
    {
        NSLog(@"its Inside Triangle Path");
    }
    else
    {
        NSLog(@"OutSide Shape");
    }
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self.view];
    if([path containsPoint:currentPoint])
    {
        NSLog(@"its Inside Triangle Path");
    }
    else
    {
        NSLog(@"OutSide Shape");
    }
}

你可以创建这样的任何形状并进行比较。

Answer 2

您需要在视图中查找触摸事件（例如TouchesBegan，TouchesMoved，TouchesEnded，TouchesCancelled）。触摸发生时，您可以在视图中获取触摸的位置。您可以使用此位置并检查该点是否在您的路径中。

请参阅此帖子：Path Interaction

Answer 3

如何绘制视图（您的bezier路径）与它们与用户（触摸）的交互方式没有多大关系。

我认为您应该在UIView子类中实现-pointInside:withEvent:，此方法确定触摸事件是否在视图中。当该点不可触及时，您应该返回NO。

像-touchesBegan:这样的方法也很有效，但有点复杂。

贝塞尔路径的透明区域不允许用户交互

3 个答案: