CATextLayer *textLayer = [CATextLayerlayer];      textLayer.frame =CGRectMake(100,100,100,100);      [self.view.layeraddSublayer:textLayer];           textLayer.foregroundColor = [UIColorblackColor].CGColor;      textLayer.alignmentMode =kCAAlignmentJustified;      textLayer.wrapped =YES;           UIFont *font = [UIFontsystemFontOfSize:15];           CFStringRef fontName = (__bridgeCFStringRef)font.fontName;      CGFontRef fontRef =CGFontCreateWithFontName(fontName);      textLayer.font = fontRef;      textLayer.fontSize = font.pointSize;      CGFontRelease(fontRef);           NSString *text =@"Cupid laid by his brand, and fell asleep";           textLayer.string = text;        textLayer.contentsScale = [UIScreen mainScreen].scale; // 在Retina显示