用CATextLayer來實現一個UILabel

   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顯示</pre>