objective-c - 如何在 CATextlayer 上重写？

Question

我正在使用 CATextLayer 进行自定义日历设计。我正在使用 CAlayer 来绘制每个月的数字。但是当我按下下一个按钮移动到下个月时，日期是重叠的。我尝试删除子层但没有用。请帮帮我。。

但是当我搬到十二月时。日期重叠

我使用的代码是：

 [date sizeWithAttributes:@{ NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Light" size:10.0] }];
            self.mainLayer = [self layer];
            [self.mainLayer setRasterizationScale:[[UIScreen mainScreen] scale]];

            self.messageLayer = [CATextLayer layer];
            [self.messageLayer setForegroundColor:[[UIColor blackColor] CGColor]];
            [self.messageLayer setContentsScale:[[UIScreen mainScreen] scale]];
            [self.messageLayer setFrame:CGRectMake(targetX+2, targetY+10, kVRGCalendarViewDayWidth, kVRGCalendarViewDayHeight)];
            [self.messageLayer setString:date];



            self.messageLayer.font = (__bridge CFTypeRef)@"HelveticaNeue-Bold";
            messageLayer.fontSize = 10;
            messageLayer.alignmentMode = kCAAlignmentCenter;
            [mainLayer addSublayer:messageLayer];

           [mainLayer setShouldRasterize:YES];