1 - (void)drawRect:(CGRect)rect 2 { 3 NSString *longText = @"CoreText"; /* ... */ 4 NSRange rang =[self.hightString rangeOfString:longText]; 5 longText = @"CoreText"; 6 NSMutableAttributedString *string = [[NSMutableAttributedString alloc] 7 initWithString:longText]; 8 9 10 if (rang.location == NSNotFound) 11 { 12 13 } 14 15 16 // make a few words bold 17 CTFontRef helvetica = CTFontCreateWithName(CFSTR("Helvetica"), 14.0, NULL); 18 CTFontRef helveticaBold = CTFontCreateWithName(CFSTR("Helvetica-Bold"), 14.0, NULL); 19 20 [string addAttribute:(id)kCTFontAttributeName 21 value:(__bridge id)helvetica 22 range:NSMakeRange(0, [string length])]; 23 24 25 [string addAttribute:(id)kCTForegroundColorAttributeName 26 value:(id)[UIColor redColor].CGColor 27 range:NSMakeRange(3, 5)]; 28 29 // layout master 30 CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString( 31 (CFAttributedStringRef)string); 32 33 // left column form 34 CGMutablePathRef leftColumnPath = CGPathCreateMutable(); 35 CGPathAddRect(leftColumnPath, NULL, 36 CGRectMake(0, 0, 37 self.bounds.size.width/2.0, 38 self.bounds.size.height)); 39 40 // left column frame 41 CTFrameRef leftFrame = CTFramesetterCreateFrame(framesetter, 42 CFRangeMake(0, 0), 43 leftColumnPath, NULL); 44 45 // right column form 46 CGMutablePathRef rightColumnPath = CGPathCreateMutable(); 47 CGPathAddRect(rightColumnPath, NULL, 48 CGRectMake(self.bounds.size.width/2.0, 0, 49 self.bounds.size.width/2.0, 50 self.bounds.size.height)); 51 52 NSInteger rightColumStart = CTFrameGetVisibleStringRange(leftFrame).length; 53 54 // right column frame 55 CTFrameRef rightFrame = CTFramesetterCreateFrame(framesetter, 56 CFRangeMake(rightColumStart, 0), 57 rightColumnPath, 58 NULL); 59 60 // flip the coordinate system 61 CGContextRef context = UIGraphicsGetCurrentContext(); 62 CGContextSetTextMatrix(context, CGAffineTransformIdentity); 63 CGContextTranslateCTM(context, 0, self.bounds.size.height); 64 CGContextScaleCTM(context, 1.0, -1.0); 65 66 // draw 67 CTFrameDraw(leftFrame, context); 68 CTFrameDraw(rightFrame, context); 69 70 // cleanup 71 CFRelease(leftFrame); 72 CGPathRelease(leftColumnPath); 73 CFRelease(rightFrame); 74 CGPathRelease(rightColumnPath); 75 CFRelease(framesetter); 76 CFRelease(helvetica); 77 CFRelease(helveticaBold); 78 // [string release]; 79 80 }