ios - CAShapeLayer：识别形状：在该形状中添加 CATextLayer

Question

我有SVG文件，并且能够使用SVGKit.

现在，我有CAShapeLayer可能包含圆形、方形或任何闭合形状。

我想以这样的方式添加CATextLayer文本CAShapeLayer不应该跨越定义的形状。

这是穿越的CATextLayer示例CAShapeLayer：

它的交叉只是因为CATextLayer从 0 位置开始，CAShapeLayer其中包含圆，特别是在这种情况下。

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。

如何识别里面的形状CAShapeLayer？或如何应用路径CATextLayer？这将确保文本将绘制在形状内？

这是添加CATextLayerOn的代码CAShapeLayer：

-(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

Use isWrapped property of CATextLayer this determines whether the text is wrapped to fit within the receiver’s bounds.

-(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;
}