浅析CoreText自由绘制（4）-竖排绘制-如何绕中心点旋转-如何强行设置字体
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Coretext竖排绘制以及如何绕中心点旋转。以及如何设置字体。
不废话。直接上代码。
// CustomView.m// testWingdings//// Created by 向晨宇 on 12-12-6.// Copyright (c) 2012年 向晨宇. All rights reserved.//#import "CustomView.h"#import <CoreText/CoreText.h>#define ARCVIEW_DEFAULT_RADIUS 90.0@implementation CustomView@synthesize ns_str;- (id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { // Initialization code self.backgroundColor = [UIColor clearColor]; } return self;}-(void)dealloc{ [ns_str release]; [super dealloc];}-(NSDictionary*) getDicWithFont{ float kLabelFontSize = 44.0; CTFontRef ref = CTFontCreateWithName((CFStringRef)@"Arial", kLabelFontSize, NULL); NSMutableDictionary *attrDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:(id)ref, (NSString *)kCTFontAttributeName, nil]; return attrDictionary;}- (void)drawRect:(CGRect)rect{ [super drawRect:rect]; NSDictionary* attrDictionary = [self getDicWithFont]; NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:ns_str attributes:attrDictionary]; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGAffineTransform textTransform = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0,0.0, 0.0); CGContextSetTextMatrix(context,textTransform); CGContextTranslateCTM(context, 0, 44); CTLineRef line = CTLineCreateWithAttributedString((CFAttributedStringRef)attString); //9-4 [attString release]; CFArrayRef runArray = CTLineGetGlyphRuns(line); //包装成一个数组 CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, 0); CFIndex runGlyphCount = CTRunGetGlyphCount(run); CTFontRef runFont = (CTFontRef)CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName); for (CFIndex runGlyphIndex = 0; runGlyphIndex < runGlyphCount; runGlyphIndex++) { CFRange glyphRange = CFRangeMake(runGlyphIndex, 1); CGGlyph glyph; CGPoint position; CTRunGetGlyphs(run, glyphRange, &glyph); CTRunGetPositions(run, glyphRange, &position); CGFontRef cgFont = CTFontCopyGraphicsFont(runFont, NULL); CGContextSetFont(context, cgFont); CGContextSetFontSize(context, CTFontGetSize(runFont)); float ascent_temp = 0.0f; float descent_temp = 0.0f; float leading_temp = 0.0f; NSNumber *widthValue = [NSNumber numberWithDouble:CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), &ascent_temp, &descent_temp, &leading_temp)]; int width = [widthValue intValue]; int height = ascent_temp+descent_temp+leading_temp; // CGContextSetRGBFillColor(context, 0.9, 0.9, 0.1, 1.0); CGContextSaveGState(context); CGContextSetTextPosition(context, position.x+width/2, position.y + height/2); CGAffineTransform cgTransform2 = CGAffineTransformMakeRotation(90*M_PI/180); CGAffineTransform result=CGAffineTransformConcat(textTransform, cgTransform2); CGContextSetTextMatrix(context, result); CGContextTranslateCTM(context,0, -width-(height-width)/2); CGContextShowGlyphsAtPoint(context, position.x , position.y, &glyph, 1); CGContextRestoreGState(context); CFRelease(cgFont); } CFRelease(line); CGContextRestoreGState(context); }-(UIFont*)customFont{// 你的字体路径 NSString *fontPath = [[NSBundle mainBundle] pathForResource:@"tom" ofType:@"ttf"]; NSURL *url = [NSURL fileURLWithPath:fontPath]; CGDataProviderRef fontDataProvider = CGDataProviderCreateWithURL(( CFURLRef)url); if (fontDataProvider == NULL) return nil; CGFontRef newFont = CGFontCreateWithDataProvider(fontDataProvider); CGDataProviderRelease(fontDataProvider); if (newFont == NULL) return nil; NSString *fontName = ( NSString *)CGFontCopyFullName(newFont); UIFont *font = [UIFont fontWithName:fontName size:12]; CGFontRelease(newFont); return font;}@end字体设置这一块折腾了很久，苹果的CTFontRef陷害了我。这个是强行设置的唯一方法。网上其他很多直接更改列表的都是不对的。那种不能兼容到所有的方法。字体绕中心点旋转也折腾了很久。本来用CONTEXT去平移，但是复杂情况还是不行。最后用矩阵解决。
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