ios - 由于某种原因，UIBezierPath 轮廓不断出现在 View 周围

Question

下面的代码是我用来创建 subview “theSubview”的代码，我将其添加到父 View “parentView”中。

假设parentView有框架{ {0.0, 0.0}, {100.0, 100.0} }并且 subview 的框架为 { {20.0, 20.0}, {20.0, 20.0} }

问题是，当我的绘图完成时，我最终不仅得到蓝色箭头标记，而且在 subview 的框架上得到一个蓝色轮廓。

知道我做错了什么吗？

谢谢!

// theSubview
// My UIView subclass that is added to another view
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        self.opaque = NO;
    }
    return self;
}

- (void)drawRect:(CGRect)rect {

    [self drawArrow];        
}

- (void)drawArrow {    
    CGRect arrowRect;

    arrowRect = self.bounds;
    UIBezierPath *arrowPath = [UIBezierPath bezierPathWithRect:arrowRect];

//    UIColor *backgrColor = [UIColor grayColor];
//    [backgrColor setFill];
//    [arrowPath fillWithBlendMode:kCGBlendModeNormal alpha:0.9f];

    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor setStroke];


    CGFloat thirdOfWidth = floorf(CGRectGetWidth(self.bounds) / 3);
    CGFloat thirdOfHeight = floorf(CGRectGetHeight(self.bounds) / 3);

    [arrowPath moveToPoint:CGPointMake(thirdOfWidth, thirdOfHeight)];
    [arrowPath addLineToPoint:CGPointMake(thirdOfWidth * 2, thirdOfHeight + (floorf(thirdOfHeight/2)))];
    [arrowPath addLineToPoint:CGPointMake(thirdOfWidth, thirdOfHeight * 2)];
    [arrowPath setLineWidth:3.0f];
    [arrowPath stroke];


}

Answer 1

呵呵，我明白了。 bezierPathWithRect 实际上使用该矩形作为路径创建了一个 bezierPath。矩形不是框架，b/c bezierPath 没有框架。b/c 它不是 UIView。

将上面的代码更改为

UIBezierPath *arrowPath = [UIBezierPath bezierPath];

修复它。