CAShapeLayer：確定形狀：在該形狀中添加CATextLayer

Question

我有SVG文件，並且能夠使用SVGKit訪問SVG的形狀。

現在，我有了CAShapeLayer ，它可能包含圓形，正方形或任何閉合形狀。

我想補充CATextLayer上CAShapeLayer以這樣的方式的文本不應該越過定義形狀。

這是在CATextLayer上穿越CATextLayer的CAShapeLayer ：

它穿越只是因為， CATextLayer是從0位置開始CAShapeLayer其中特別包含這種情況下一圈。

就我而言， CAShapeLayer可以包含任何閉合形狀。 它也可以是橢圓形的。

如何識別CAShapeLayer內部的CAShapeLayer ？ 或如何將路徑應用於CATextLayer ？ 這樣可以確保將文本繪制在內部形狀中？

這是在CAShapeLayer上添加CATextLayer代碼：

-(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屬性可以確定是否將文本CATextLayer以適合接收者的邊界。

-(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;
}