iOS之CATextLayer屬性簡介

標籤：結束   tla   屬性   bsp   渲染   star   anti   置中   getter   

1、CATextLayer簡介

　　CATextLayer快速高效簡單地來渲染純文字、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_BEGINCA_CLASS_AVAILABLE (10.5, 2.0, 9.0, 2.0)@interface CATextLayer : CALayer{@private    struct CATextLayerPrivate *_state;}//渲染的字串@property(nullable, copy) id string;//字型@property(nullable) CFTypeRef font;//字型大小@property CGFloat fontSize;//文字顏色@property(nullable) CGColorRef foregroundColor;//是否換行，預設NO@property(getter=isWrapped) BOOL wrapped;//枚舉：設定截斷模式@property(copy) NSString *truncationMode;//枚舉：設定對其模式@property(copy) NSString *alignmentMode;//文字是否像素化，預設NO@property BOOL allowsFontSubpixelQuantization;@end/* Truncation modes. */CA_EXTERN NSString * const kCATruncationNone    //不剪裁，預設CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCATruncationStart   //剪裁開始部分CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCATruncationEnd     //剪裁結束部分CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCATruncationMiddle  //剪裁中間部分CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);/* Alignment modes. */CA_EXTERN NSString * const kCAAlignmentNatural  //預設CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCAAlignmentLeft     //靠左對齊CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCAAlignmentRight    //靠右對齊CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCAAlignmentCenter   //置中對齊CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);CA_EXTERN NSString * const kCAAlignmentJustified    //左右對齊CA_AVAILABLE_STARTING (10.5, 3.2, 9.0, 2.0);NS_ASSUME_NONNULL_END

 

iOS之CATextLayer屬性簡介