1、CATextLayer简介

  CATextLayer快速高效简单地来渲染纯文本、NSAttributedString

/* The text layer provides simple text layout and rendering of plain
* or attributed strings. The first line is aligned to the top of the
* layer. */ NS_ASSUME_NONNULL_BEGIN CA_CLASS_AVAILABLE (10.5, 2.0, 9.0, 2.0)
@interface CATextLayer : CALayer
{
@private
struct CATextLayerPrivate *_state;
} //渲染的字符串
@property(nullable, copy) id string; //字体
@property(nullable) CFTypeRef font; //字号
@property CGFloat fontSize; //文字颜色
@property(nullable) CGColorRef foregroundColor; //是否换行,默认NO
@property(getter=isWrapped) BOOL wrapped; //枚举:设置截断模式
@property(copy) NSString *truncationMode; //枚举:设置对其模式
@property(copy) NSString *alignmentMode; //文字是否像素化,默认NO
@property BOOL allowsFontSubpixelQuantization; @end /* Truncation modes. */ CA_EXTERN NSString * const kCATruncationNone //不剪裁,默认
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCATruncationStart //剪裁开始部分
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCATruncationEnd //剪裁结束部分
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCATruncationMiddle //剪裁中间部分
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0); /* Alignment modes. */ CA_EXTERN NSString * const kCAAlignmentNatural //默认
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCAAlignmentLeft //左对齐
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCAAlignmentRight //右对齐
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCAAlignmentCenter //居中对齐
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);
CA_EXTERN NSString * const kCAAlignmentJustified //两端对齐
CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0); NS_ASSUME_NONNULL_END
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