Bir uygulama için 2 daireler çizdik yapıyorum. Biri diğerinden daha biraz daha büyük. Yapıyorum dairesel bir menü için o satırları arasında metin eğri, istiyorum.

Okuduğum en şeyler hakkında kıvrımlı bir metin var ayrılmak metin karakterleri ve beraberlik her karakter kendi ile dik açı aklında (döndürerek kapsamında olduğunuz çizim).

Ben sadece başımı karakterlerim için doğru açı ve pozisyon almak konusunda almıyor.

Bu menü, şu anda, gibi görünüyor ne bir ekran görüntüsü ekledim. Sadece metinleri ben bir UİİmageView bir görüntü yüklenir tarafından eklenmiştir.

Birisi belirli noktalarda beyaz bir daire içinde metin çizebilirsiniz nasıl, bana bir başlangıç noktası olabilir umarım.

EDİT: Tamam, şu anda bu noktada duyuyorum

Ben aşağıdaki kodu kullanarak gerçekleştirmek:

- (UIImage*) createMenuRingWithFrame:(CGRect)frame
{
    CGRect imageSize = CGRectMake(0,0,300,300);
    float perSectionDegrees = 360 / [sections count];
    float totalRotation = 90;
    char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding];

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, imageSize.size.width, imageSize.size.height, 8, 4 * imageSize.size.width, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);
    CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman);

    CGContextSetRGBFillColor(context, 0, 0, 0, 1);

    CGPoint centerPoint = CGPointMake(imageSize.size.width / 2, imageSize.size.height / 2);
    double radius = (frame.size.width / 2);

    CGContextStrokeEllipseInRect(context, CGRectMake(centerPoint.x - (frame.size.width / 2), centerPoint.y - (frame.size.height / 2), frame.size.width, frame.size.height));

    for (int index = 0; index < [sections count]; index  )
    {
        NSString* menuItemText = [sections objectAtIndex:index];
        CGSize textSize = [menuItemText sizeWithFont:self.menuItemsFont];
        char* menuItemTextChar = (char*)[menuItemText cStringUsingEncoding:NSASCIIStringEncoding];

        float x = centerPoint.x   radius * cos(degreesToRadians(totalRotation));
        float y = centerPoint.y   radius * sin(degreesToRadians(totalRotation));

        CGContextSaveGState(context);

        CGContextTranslateCTM(context, x, y);
        CGContextRotateCTM(context, degreesToRadians(totalRotation - 90));
        CGContextShowTextAtPoint(context, 0 - (textSize.width / 2), 0 - (textSize.height / 2), menuItemTextChar, strlen(menuItemTextChar));

        CGContextRestoreGState(context);

        totalRotation  = perSectionDegrees;
    }

    CGImageRef contextImage = CGBitmapContextCreateImage(context);

    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);

    return [UIImage imageWithCGImage:contextImage];
}

Bu orada kullandığım değişkenleri:

NSArray* sections = [[NSArray alloc] initWithObjects:@"settings", @"test", @"stats", @"nog iets", @"woei", @"woei2", nil];
self.menuItemsFont = [UIFont fontWithName:@"VAGRounded-Bold" size:18];

Kelimelerin rotasyon doğru yerleştirilmesi de görünüyor. Şimdi hangi dönme harfleri (ve onların koordinatları) olmalıdır çözmem lazım bir şekilde. Bu konuda yardım alabilirim.

Düzenleme:Sabit! Aşağıdaki kodu göz atın!

- (void) drawStringAtContext:(CGContextRef) context string:(NSString*) text atAngle:(float) angle withRadius:(float) radius
{
    CGSize textSize = [text sizeWithFont:self.menuItemsFont];

    float perimeter = 2 * M_PI * radius;
    float textAngle = textSize.width / perimeter * 2 * M_PI;

    angle  = textAngle / 2;

    for (int index = 0; index < [text length]; index  )
    {
        NSRange range = {index, 1};
        NSString* letter = [text substringWithRange:range];     
        char* c = (char*)[letter cStringUsingEncoding:NSASCIIStringEncoding];
        CGSize charSize = [letter sizeWithFont:self.menuItemsFont];

        NSLog(@"Char %@ with size: %f x %f", letter, charSize.width, charSize.height);

        float x = radius * cos(angle);
        float y = radius * sin(angle);

        float letterAngle = (charSize.width / perimeter * -2 * M_PI);

        CGContextSaveGState(context);
        CGContextTranslateCTM(context, x, y);
        CGContextRotateCTM(context, (angle - 0.5 * M_PI));
        CGContextShowTextAtPoint(context, 0, 0, c, strlen(c));
        CGContextRestoreGState(context);

        angle  = letterAngle;
    }
}

- (UIImage*) createMenuRingWithFrame:(CGRect)frame
{
    CGPoint centerPoint = CGPointMake(frame.size.width / 2, frame.size.height / 2);
    char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding];

    CGFloat* ringColorComponents = (float*)CGColorGetComponents(ringColor.CGColor);
    CGFloat* textColorComponents = (float*)CGColorGetComponents(textColor.CGColor);

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, frame.size.width, frame.size.height, 8, 4 * frame.size.width, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);

    CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman);
    CGContextSetRGBStrokeColor(context, ringColorComponents[0], ringColorComponents[1], ringColorComponents[2], ringAlpha);
    CGContextSetLineWidth(context, ringWidth);  

    CGContextStrokeEllipseInRect(context, CGRectMake(ringWidth, ringWidth, frame.size.width - (ringWidth * 2), frame.size.height - (ringWidth * 2)));
    CGContextSetRGBFillColor(context, textColorComponents[0], textColorComponents[1], textColorComponents[2], textAlpha);

    CGContextSaveGState(context);
    CGContextTranslateCTM(context, centerPoint.x, centerPoint.y);

    float angleStep = 2 * M_PI / [sections count];
    float angle = degreesToRadians(90);

    textRadius = textRadius - 12;

    for (NSString* text in sections)
    {
        [self drawStringAtContext:context string:text atAngle:angle withRadius:textRadius];
        angle -= angleStep;
    }

    CGContextRestoreGState(context);

    CGImageRef contextImage = CGBitmapContextCreateImage(context);

    CGContextRelease(context);
    CGColorSpaceRelease(colorSpace);

    [self saveImage:[UIImage imageWithCGImage:contextImage] withName:@"test.png"];
    return [UIImage imageWithCGImage:contextImage];

}

Apple'ın CoreTextArcCocoa örnek proje (this reply Tom H tarafından belirtilen) ben de uyum sağladım ve burada paylaşmak istedim.

Ekledim bir kaç diğer özellikleri, gibi yetenek set ark boyutu için daha küçük bir şey daha 180 ve metin rengi ve ofset shift gibi özellikleri (böylece zorunda değilsiniz büyük bir çerçeve için, Göster tüm metin).

 /*

 File: CoreTextArcView.m (iOS version)

 Abstract: Defines and implements the CoreTextArcView custom UIView subclass to
 draw text on a curve and illustrate best practices with CoreText.

 Based on CoreTextArcView provided by Apple for Mac OS X https://developer.apple.com/library/mac/#samplecode/CoreTextArcCocoa/Introduction/Intro.html

 Ported to iOS (& added color, arcsize features) August 2011 by Alec Vance, Juggleware LLC http://juggleware.com/

 */ 

#import <UIKit/UIKit.h>
#import <CoreText/CoreText.h>


@interface CoreTextArcView : UIView {
@private
    UIFont *            _font;
    NSString *          _string;
    CGFloat             _radius;
    UIColor *           _color;
    CGFloat             _arcSize;
    CGFloat             _shiftH, _shiftV; // horiz & vertical shift

    struct {
        unsigned int    showsGlyphBounds:1;
        unsigned int    showsLineMetrics:1;
        unsigned int    dimsSubstitutedGlyphs:1;
        unsigned int    reserved:29;
    }                   _flags;
}

@property(retain, nonatomic) UIFont *font;
@property(retain, nonatomic) NSString *text;
@property(readonly, nonatomic) NSAttributedString *attributedString;
@property(assign, nonatomic) CGFloat radius;
@property(nonatomic) BOOL showsGlyphBounds;
@property(nonatomic) BOOL showsLineMetrics;
@property(nonatomic) BOOL dimsSubstitutedGlyphs;
@property(retain, nonatomic) UIColor *color;
@property(nonatomic) CGFloat arcSize;
@property(nonatomic) CGFloat shiftH, shiftV;
@end


/*

 File: CoreTextArcView.m (iOS version)

 */ 

#import "CoreTextArcView.h"
#import <AssertMacros.h>
#import <QuartzCore/QuartzCore.h>

#define ARCVIEW_DEBUG_MODE          NO

#define ARCVIEW_DEFAULT_FONT_NAME   @"Helvetica"
#define ARCVIEW_DEFAULT_FONT_SIZE   64.0
#define ARCVIEW_DEFAULT_RADIUS      150.0
#define ARCVIEW_DEFAULT_ARC_SIZE    180.0



@implementation CoreTextArcView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.font = [UIFont fontWithName:ARCVIEW_DEFAULT_FONT_NAME size:ARCVIEW_DEFAULT_FONT_SIZE];
        self.text = @"Curvaceous Type";
        self.radius = ARCVIEW_DEFAULT_RADIUS;
        self.showsGlyphBounds = NO;
        self.showsLineMetrics = NO;
        self.dimsSubstitutedGlyphs = NO;
        self.color = [UIColor whiteColor];
        self.arcSize = ARCVIEW_DEFAULT_ARC_SIZE;
        self.shiftH = self.shiftV = 0.0f;
    }
    return self;
}

typedef struct GlyphArcInfo {
    CGFloat         width;
    CGFloat         angle;  // in radians
} GlyphArcInfo;

static void PrepareGlyphArcInfo(CTLineRef line, CFIndex glyphCount, GlyphArcInfo *glyphArcInfo, CGFloat arcSizeRad)
{
    NSArray *runArray = (NSArray *)CTLineGetGlyphRuns(line);

    // Examine each run in the line, updating glyphOffset to track how far along the run is in terms of glyphCount.
    CFIndex glyphOffset = 0;
    for (id run in runArray) {
        CFIndex runGlyphCount = CTRunGetGlyphCount((CTRunRef)run);

        // Ask for the width of each glyph in turn.
        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex  ) {
            glyphArcInfo[runGlyphIndex   glyphOffset].width = CTRunGetTypographicBounds((CTRunRef)run, CFRangeMake(runGlyphIndex, 1), NULL, NULL, NULL);
        }

        glyphOffset  = runGlyphCount;
    }

    double lineLength = CTLineGetTypographicBounds(line, NULL, NULL, NULL);

    CGFloat prevHalfWidth = glyphArcInfo[0].width / 2.0;
    glyphArcInfo[0].angle = (prevHalfWidth / lineLength) * arcSizeRad;

    // Divide the arc into slices such that each one covers the distance from one glyph's center to the next.
    CFIndex lineGlyphIndex = 1;
    for (; lineGlyphIndex < glyphCount; lineGlyphIndex  ) {
        CGFloat halfWidth = glyphArcInfo[lineGlyphIndex].width / 2.0;
        CGFloat prevCenterToCenter = prevHalfWidth   halfWidth;

        glyphArcInfo[lineGlyphIndex].angle = (prevCenterToCenter / lineLength) * arcSizeRad;

        prevHalfWidth = halfWidth;
    }
}


// ensure that redraw occurs.
-(void)setText:(NSString *)text{
    [_string release];
    _string = [text retain];

    [self setNeedsDisplay];
}

//set arc size in degrees (180 = half circle)
-(void)setArcSize:(CGFloat)degrees{
    _arcSize = degrees * M_PI/180.0;
}

//get arc size in degrees
-(CGFloat)arcSize{
    return _arcSize * 180.0/M_PI;
}

- (void)drawRect:(CGRect)rect {
    // Don't draw if we don't have a font or string
    if (self.font == NULL || self.text == NULL) 
        return;

    // Initialize the text matrix to a known value
    CGContextRef context = UIGraphicsGetCurrentContext();


    //Reset the transformation
    //Doing this means you have to reset the contentScaleFactor to 1.0
    CGAffineTransform t0 = CGContextGetCTM(context);


    CGFloat xScaleFactor = t0.a > 0 ? t0.a : -t0.a;
    CGFloat yScaleFactor = t0.d > 0 ? t0.d : -t0.d;
    t0 = CGAffineTransformInvert(t0);
    if (xScaleFactor != 1.0 || yScaleFactor != 1.0)
        t0 = CGAffineTransformScale(t0, xScaleFactor, yScaleFactor);

    CGContextConcatCTM(context, t0);

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);

    if(ARCVIEW_DEBUG_MODE){
        // Draw a black background (debug)
        CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
        CGContextFillRect(context, self.layer.bounds);
    }

    NSAttributedString *attStr = self.attributedString;
    CFAttributedStringRef asr = (CFAttributedStringRef)attStr;
    CTLineRef line = CTLineCreateWithAttributedString(asr);
    assert(line != NULL);

    CFIndex glyphCount = CTLineGetGlyphCount(line);
    if (glyphCount == 0) {
        CFRelease(line);
        return;
    }

    GlyphArcInfo *  glyphArcInfo = (GlyphArcInfo*)calloc(glyphCount, sizeof(GlyphArcInfo));
    PrepareGlyphArcInfo(line, glyphCount, glyphArcInfo, _arcSize);

    // Move the origin from the lower left of the view nearer to its center.
    CGContextSaveGState(context);

    CGContextTranslateCTM(context, CGRectGetMidX(rect) _shiftH, CGRectGetMidY(rect) _shiftV - self.radius / 2.0);

    if(ARCVIEW_DEBUG_MODE){
        // Stroke the arc in red for verification.
        CGContextBeginPath(context);
        CGContextAddArc(context, 0.0, 0.0, self.radius, M_PI_2 _arcSize/2.0, M_PI_2-_arcSize/2.0, 1);
        CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);
        CGContextStrokePath(context);
    }

    // Rotate the context 90 degrees counterclockwise (per 180 degrees)
    CGContextRotateCTM(context, _arcSize/2.0);

    // Now for the actual drawing. The angle offset for each glyph relative to the previous glyph has already been calculated; with that information in hand, draw those glyphs overstruck and centered over one another, making sure to rotate the context after each glyph so the glyphs are spread along a semicircular path.

    CGPoint textPosition = CGPointMake(0.0, self.radius);
    CGContextSetTextPosition(context, textPosition.x, textPosition.y);

    CFArrayRef runArray = CTLineGetGlyphRuns(line);
    CFIndex runCount = CFArrayGetCount(runArray);

    CFIndex glyphOffset = 0;
    CFIndex runIndex = 0;
    for (; runIndex < runCount; runIndex  ) {
        CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(runArray, runIndex);
        CFIndex runGlyphCount = CTRunGetGlyphCount(run);
        Boolean drawSubstitutedGlyphsManually = false;
        CTFontRef runFont = CFDictionaryGetValue(CTRunGetAttributes(run), kCTFontAttributeName);

        // Determine if we need to draw substituted glyphs manually. Do so if the runFont is not the same as the overall font.
        if (self.dimsSubstitutedGlyphs && ![self.font isEqual:(UIFont *)runFont]) {
            drawSubstitutedGlyphsManually = true;
        }

        CFIndex runGlyphIndex = 0;
        for (; runGlyphIndex < runGlyphCount; runGlyphIndex  ) {
            CFRange glyphRange = CFRangeMake(runGlyphIndex, 1);
            CGContextRotateCTM(context, -(glyphArcInfo[runGlyphIndex   glyphOffset].angle));

            // Center this glyph by moving left by half its width.
            CGFloat glyphWidth = glyphArcInfo[runGlyphIndex   glyphOffset].width;
            CGFloat halfGlyphWidth = glyphWidth / 2.0;
            CGPoint positionForThisGlyph = CGPointMake(textPosition.x - halfGlyphWidth, textPosition.y);

            // Glyphs are positioned relative to the text position for the line, so offset text position leftwards by this glyph's width in preparation for the next glyph.
            textPosition.x -= glyphWidth;

            CGAffineTransform textMatrix = CTRunGetTextMatrix(run);
            textMatrix.tx = positionForThisGlyph.x;
            textMatrix.ty = positionForThisGlyph.y;
            CGContextSetTextMatrix(context, textMatrix);

            if (!drawSubstitutedGlyphsManually) {
                CTRunDraw(run, context, glyphRange);
            } 
            else {
                // We need to draw the glyphs manually in this case because we are effectively applying a graphics operation by setting the context fill color. Normally we would use kCTForegroundColorAttributeName, but this does not apply as we don't know the ranges for the colors in advance, and we wanted demonstrate how to manually draw.
                CGFontRef cgFont = CTFontCopyGraphicsFont(runFont, NULL);
                CGGlyph glyph;
                CGPoint position;

                CTRunGetGlyphs(run, glyphRange, &glyph);
                CTRunGetPositions(run, glyphRange, &position);

                CGContextSetFont(context, cgFont);
                CGContextSetFontSize(context, CTFontGetSize(runFont));
                CGContextSetRGBFillColor(context, 0.25, 0.25, 0.25, 0.5);
                CGContextShowGlyphsAtPositions(context, &glyph, &position, 1);

                CFRelease(cgFont);
            }

            // Draw the glyph bounds 
            if ((self.showsGlyphBounds) != 0) {
                CGRect glyphBounds = CTRunGetImageBounds(run, context, glyphRange);

                CGContextSetRGBStrokeColor(context, 0.0, 0.0, 1.0, 1.0);
                CGContextStrokeRect(context, glyphBounds);
            }
            // Draw the bounding boxes defined by the line metrics
            if ((self.showsLineMetrics) != 0) {
                CGRect lineMetrics;
                CGFloat ascent, descent;

                CTRunGetTypographicBounds(run, glyphRange, &ascent, &descent, NULL);

                // The glyph is centered around the y-axis
                lineMetrics.origin.x = -halfGlyphWidth;
                lineMetrics.origin.y = positionForThisGlyph.y - descent;
                lineMetrics.size.width = glyphWidth; 
                lineMetrics.size.height = ascent   descent;

                CGContextSetRGBStrokeColor(context, 0.0, 1.0, 0.0, 1.0);
                CGContextStrokeRect(context, lineMetrics);
            }
        }

        glyphOffset  = runGlyphCount;
    }

    CGContextRestoreGState(context);

    free(glyphArcInfo);
    CFRelease(line);    



}

-(void)dealloc
{
    [_font release];
    [_string release];
    [_color release];
    [super dealloc]
}

@synthesize font = _font;
@synthesize text = _string;
@synthesize radius = _radius;
@synthesize color = _color;
@synthesize arcSize = _arcSize;
@synthesize shiftH = _shiftH;
@synthesize shiftV = _shiftV;

@dynamic attributedString;
- (NSAttributedString *)attributedString {
    // Create an attributed string with the current font and string.
    assert(self.font != nil);
    assert(self.text != nil);

    // Create our attributes...

    // font
    CTFontRef fontRef = CTFontCreateWithName((CFStringRef)self.font.fontName, self.font.pointSize, NULL);

    // color
    CGColorRef colorRef = self.color.CGColor;

    // pack it into attributes dictionary

    NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                    (id)fontRef, (id)kCTFontAttributeName,
                                    colorRef, (id)kCTForegroundColorAttributeName,
                                    nil];
    assert(attributesDict != nil);


    // Create the attributed string
    NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:self.text attributes:attributesDict];

    CFRelease(fontRef);

    return [attrString autorelease];
}

@dynamic showsGlyphBounds;
- (BOOL)showsGlyphBounds {
    return _flags.showsGlyphBounds;
}

- (void)setShowsGlyphBounds:(BOOL)show {
    _flags.showsGlyphBounds = show ? 1 : 0;
}

@dynamic showsLineMetrics;
- (BOOL)showsLineMetrics {
    return _flags.showsLineMetrics;
}

- (void)setShowsLineMetrics:(BOOL)show {
    _flags.showsLineMetrics = show ? 1 : 0;
}

@dynamic dimsSubstitutedGlyphs;
- (BOOL)dimsSubstitutedGlyphs {
    return _flags.dimsSubstitutedGlyphs;
}

- (void)setDimsSubstitutedGlyphs:(BOOL)dim {
    _flags.dimsSubstitutedGlyphs = dim ? 1 : 0;
}

@end