StackOverflow2013

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17352075
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2013-06-27T19:54:48.877
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2013-06-27T19:54:48.877
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text
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<p>When the convinient methods from apple dont work, this category provides a good aproximation in most cases.</p> <pre><code>@implementation NSAttributedString (PixLib) - (CGFloat)heightForWidth:(CGFloat)width { CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, NULL, CGRectMake(0, 0, width, 99999)); CGFloat h = [self heightForPath:path]; CGPathRelease(path); return h; } - (CGFloat)heightForPath:(CGPathRef)path { CGFloat height = 0; CTFrameRef frame = [self cfframeForPath:path]; if (frame != NULL) { NSArray* lines = (__bridge NSArray*)CTFrameGetLines(frame); int l = [lines count]; if (l > 1) { CGPoint origins[l]; CTFrameGetLineOrigins(frame, CFRangeMake(0, l), origins); CGFloat yFirst = origins[0].y; CGFloat yLast = origins[l-1].y; CGFloat ascent, descent, leading; CTLineGetTypographicBounds((__bridge CTLineRef)[lines objectAtIndex:l-1], &ascent, &descent, &leading); height = ceilf((ascent+descent+leading)*1.3) + yFirst-yLast; } else { if (l==1) { CGFloat ascent, descent, leading; CTLineGetTypographicBounds((__bridge CTLineRef)[lines objectAtIndex:0], &ascent, &descent, &leading); height = ceilf(ascent+descent+leading)*1.3; } } CFRelease(frame); } return height; } - (CTFrameRef)cfframeForPath:(CGPathRef)p { // hack to avoid bugs width different behavior in iOS <4.3 and >4.3 CGMutablePathRef path = CGPathCreateMutable(); CGRect r = CGPathGetBoundingBox(p); CGAffineTransform t = CGAffineTransformIdentity; t = CGAffineTransformTranslate(t, r.origin.x, r.origin.y); t = CGAffineTransformScale(t, 1, -1); t = CGAffineTransformTranslate(t, r.origin.x, - ( r.origin.y + r.size.height )); CGPathAddPath(path, &t, p); CGPathMoveToPoint(path, NULL, 0, 0); CGPathCloseSubpath(path); // hack end CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)self); CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL); CFRelease(framesetter); CGPathRelease(path); return frame; } @end </code></pre>
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1. This table or related slice is empty.
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1. POCalculate Height from NSAttributedString with NSParagraphStyle
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1. PTAnswer
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1. USJonathan Cichon
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1. COit doesn't work with the line spacing. I add a NSParagrahStyle to the NSAttributedLabel but it doesn't calculate the linespacing…
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  USmariusLAN

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