Как добавить UIView к CALayer

Question

Я пытаюсь добавить пользовательский UIView в CALayer, но он не отображается.

Я не добавляю пользовательский вид в другое представление. Вместо этого я пытаюсь добавить его непосредственно в CALayer.

Если я добавляю пользовательский вид в другое представление (т. Е. [self.view addSubview:customView]), он работает, но по какой-то причине начинает вызывать сбои в тот момент, когда коснется экран.

Так Основном

[self.view addSubview:customView]; 
[layer addSublayer:customView.layer]; //Causes crashes the minute the screen is touched 

Ниже приведен код:

CustomView *customView = [[CustomView alloc] initWithFrame:frame]; 

//I'm not adding the custom view to another view 
//Instead I'm trying to add it to a CALayer 

CALayer *layer = [CALayer layer]; 
[Layer setFrame:frame2]; 
[layer addSublayer: customView.layer]; 

P.S. Моим текущим обходным путем является преобразование UIView в UIImage и добавление его в CALayer.

Белу обычай UIView Код:

- (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 = @"Curva Style Label"; 

    NSLog(@"FONT = %@, TEXT = %@", self.font, self.text); 

    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; 

}

- (id)initWithFrame:(CGRect)frame font:(UIFont *)font text:(NSString *)text radius:(float)radius arcSize:(float)arcSize color:(UIColor *)color{ 

self = [super initWithFrame:frame]; 
if (self) { 
    self.font = font; 
    self.text = text; 
    self.radius = radius; 
    self.showsGlyphBounds = NO;// Border add for each Text 
    self.showsLineMetrics = NO; 
    self.dimsSubstitutedGlyphs = NO; 
    self.color = color; 
    self.arcSize = arcSize; 
    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 (линия);

// 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; 
} 

}

-(void)setText:(NSString *)text{ 
//[_string release]; 
_string = text; 

[self setNeedsDisplay]; 

}

-(void)setArcSize:(CGFloat)degrees{ 

_arcSize = degrees * M_PI/180.0; 

}

-(CGFloat)arcSize{ 
NSLog(@"arcSize %f",_arcSize * 180.0/M_PI); 

return _arcSize * 180.0/M_PI; 

}

- (void)drawRect:(CGRect)rect { 
    // Don't draw if we don't have a font or string 

NSLog(@"FONT = %@, TEXT = %@", self.font, self.text); 

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); 
CGContextSetShadowWithColor(context, CGSizeMake(self.xOffsetShadow, self.yOffsetShadow), self.blurShadow, self.shadowColor.CGColor); 

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 = (__bridge 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); 

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:(__bridge 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; 
} 

CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor); 
CGContextSetAlpha(context,0.0); 
CGContextFillRect(context, rect); 

CGContextRestoreGState(context); 

free(glyphArcInfo); 
CFRelease(line); 

}

@synthesize font = _font; 
@synthesize text = _string; 
@synthesize radius = _radius; 
@synthesize color = _color; 
@synthesize arcSize = _arcSize; 
@synthesize shiftH = _shiftH; 
@synthesize shiftV = _shiftV; 
@synthesize shadowColor = _shadowColor; 
@synthesize xOffsetShadow = _xOffsetShadow; 
@synthesize blurShadow = _blurShadow; 
@synthesize yOffsetShadow = _yOffsetShadow; 

@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: 
           (__bridge id)fontRef, (id)kCTFontAttributeName, 
           colorRef, (id)kCTForegroundColorAttributeName, 
           nil]; 
assert(attributesDict != nil); 


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

return attrString; 

}

@end 

Answer 1

Вы должны действительно спросить о проблеме, а не о вашей попытке исправить эту проблему:

[self.view addSubview:customView]; 
[layer addSublayer:customView.layer]; 
//Causes crashes the minute the screen is touched 

Вам не нужно добавлять подвью и слой, просто добавьте subview. То, что вы делаете, это отключение чего-то или чрезмерное исправление и создание нежелательного поведения.

Если вы хотите добавить слои к слоям, то используйте слои, а не виды. Представления собственные слои, и вы не должны пытаться отключить их или сохранить слой, когда его вид будет освобожден.

Итак, в идеале создайте подкласс CALayer и переместите весь код, который у вас есть в настоящее время, в его метод drawInContext:. Похоже, вы можете просто скопировать и вставить его, так как весь ваш текущий код в любом случае рисует CGContext.