CAShapeLayer：识别形状：在该形状中添加CATextLayer

Question

我有 SVG 文件，我可以使用SVGKit访问SVG的形状。

现在，我有CAShapeLayer可能包含圆形，方形或任何封闭形状。

我想在CATextLayer上添加CAShapeLayer，使文字不会超出定义的形状。

以下是在CATextLayer上交叉CAShapeLayer的示例：

它只是因为，CATextLayer从CAShapeLayer的0位开始，其中包含圆圈，特别是这种情况。

就我而言，CAShapeLayer可以包含任何封闭的形状。它也可以是椭圆形的。

如何识别CAShapeLayer内的形状？或者我如何应用CATextLayer的路径？这将确保文本将在形状内绘制？

以下是在CATextLayer上添加CAShapeLayer的代码：

-(CATextLayer *)addTrackerNumberToLayer:(NSString *)numbers{
    self.numbersTextLayer = [CATextLayer new];
    self.numbersTextLayer.foregroundColor = [UIColor blackColor].CGColor;
    self.numbersTextLayer.font = (__bridge CFTypeRef _Nullable)([UIFont boldSystemFontOfSize:15]);
    self.numbersTextLayer.fontSize=25;
    self.numbersTextLayer.anchorPoint = CGPointZero;
    self.numbersTextLayer.frame = CGRectMake(self.parentShapeLayer.bounds.size.width*0.05, self.parentShapeLayer.bounds.size.height*0.05, self.parentShapeLayer.bounds.size.width*0.90, self.parentShapeLayer.bounds.size.height*0.30);
    self.numbersTextLayer.position = CGPointMake(self.parentShapeLayer.bounds.size.width*0.05,self.parentShapeLayer.bounds.size.height*0.05);
    self.numbersTextLayer.alignmentMode = kCAAlignmentCenter;

    [self.parentShapeLayer addSublayer:self.numbersTextLayer];
}

Answer 1

使用isWrapped CATextLayer属性确定文本是否被包装以适合接收者的范围。

-(CATextLayer *)addTrackerNumberToLayer:(NSString *)numbers{
    self.numbersTextLayer = [CATextLayer new];
    self.numbersTextLayer.foregroundColor = [UIColor blackColor].CGColor;
    self.numbersTextLayer.font = (__bridge CFTypeRef _Nullable)([UIFont boldSystemFontOfSize:15]);
    self.numbersTextLayer.fontSize=25;
    self.numbersTextLayer.anchorPoint = CGPointZero;
    self.numbersTextLayer.frame = CGRectMake(self.parentShapeLayer.bounds.size.width*0.05, self.parentShapeLayer.bounds.size.height*0.05, self.parentShapeLayer.bounds.size.width*0.90, self.parentShapeLayer.bounds.size.height*0.30);
    self.numbersTextLayer.position = CGPointMake(self.parentShapeLayer.bounds.size.width*0.05,self.parentShapeLayer.bounds.size.height*0.05);
    self.numbersTextLayer.alignmentMode = kCAAlignmentCenter;
    [self.numbersTextLayer setWrapped:YES];//User Wrapped to YES to imbound the text to fit in the region.
    [self.parentShapeLayer setMasksToBounds:YES];
    [self.parentShapeLayer addSublayer:self.numbersTextLayer];
    return self.numbersTextLayer;
}