[WP/153] CGContextShowTextAtPoint vs. CoreText

0.m

#import <CoreText/CoreText.h>

- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0, -1.0));
    CGContextSetTextDrawingMode(context, kCGTextFill);

    // CGContextShowTextAtPoint 를 사용하는 경우
    CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
    CGContextSelectFont(context, "Helvetica", 10.0, kCGEncodingMacRoman);
    NSString *textString = [[NSString alloc] initWithString:@"CGContextShowTextAtPoint"];
    CGContextShowTextAtPoint(context, 0, 10, [textString UTF8String], strlen([textString UTF8String]));

    // CoreText 를 사용하는 경우
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:@"CoreText"];

    CTFontRef helvetica = CTFontCreateWithName(CFSTR("Helvetica"), 10.0, NULL);
    [string addAttribute:(id)kCTFontAttributeName value:(__bridge id)helvetica range:NSMakeRange(0, [string length])];
    [string addAttribute:(id)kCTForegroundColorAttributeName value:(id)[UIColor blackColor].CGColor range:NSMakeRange(0, [string length])];

    CTFramesetterRef textFramesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)string);

    CGMutablePathRef textPath = CGPathCreateMutable();
    CGPathAddRect(textPath, NULL, CGRectMake(0, 10, 100, 20));

    CTFrameRef textFrame = CTFramesetterCreateFrame(textFramesetter, CFRangeMake(0, 0), textPath, NULL);

    CTFrameDraw(textFrame, context);

    CFRelease(textFrame);
    CGPathRelease(textPath);
    CFRelease(textFramesetter);
    CFRelease(helvetica);
}