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Core Text is aCore Foundation styleAPI inmacOS, first introduced inMac OS X 10.4 Tiger, made public inMac OS X 10.5 Leopard, and introduced for theiPad with iPhone SDK 3.2. Exposing aCAPI, it replaces the text rendering abilities of the now-deprecatedQuickDraw andATSUI frameworks in previous versions of Mac OS X. According to Apple, Core Text is "designed for high performance and ease of use" and its layout API is "simple, consistent, and tightly integrated with Core Foundation, Core Graphics, and Cocoa."[1]
Core Text provides the following opaque types:
The following code displays the text "Hello, World!" to the given graphics context inObjective-C.
// Prepare fontCTFontReffont=CTFontCreateWithName(CFSTR("Times"),48,NULL);// Create an attributed stringCFStringRefkeys[]={kCTFontAttributeName};CFTypeRefvalues[]={font};CFDictionaryRefattr=CFDictionaryCreate(NULL,(constvoid**)&keys,(constvoid**)&values,sizeof(keys)/sizeof(keys[0]),&kCFTypeDictionaryKeyCallBacks,&kCFTypeDictionaryValueCallBacks);CFAttributedStringRefattrString=CFAttributedStringCreate(NULL,CFSTR("Hello, World!"),attr);CFRelease(attr);// Draw the stringCTLineRefline=CTLineCreateWithAttributedString(attrString);CGContextSetTextMatrix(context,CGAffineTransformIdentity);//Use this one when using standard view coordinates//CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0, -1.0)); //Use this one if the view's coordinates are flippedCGContextSetTextPosition(context,10,20);CTLineDraw(line,context);// Clean upCFRelease(line);CFRelease(attrString);CFRelease(font);
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