尝试在ios模拟器上运行示例应用时出错

我无法理解的意外错误如下：

"_CGAffineTransformIdentity", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CGContextAddLineToPoint", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextAddPath", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o "_CGContextFillPath", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o "_CGContextMoveToPoint", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextScaleCTM", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CGContextSetFillColorWithColor", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o "_CGContextSetGrayStrokeColor", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextSetLineJoin", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o "_CGContextSetLineWidth", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextSetShadowWithColor", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CGContextSetStrokeColorWithColor", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextSetTextMatrix", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CGContextSetTextPosition", referenced from: -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o "_CGContextStrokePath", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGContextTranslateCTM", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CGPathAddRect", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel sizeThatFits:] in TTTAttributedLabel.o "_CGPathCreateMutable", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel sizeThatFits:] in TTTAttributedLabel.o "_CGRectContainsPoint", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o "_CGRectGetWidth", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGRectInset", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o "_CGRectZero", referenced from: -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CGSizeZero", referenced from: -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CTFontCreateCopyWithAttributes", referenced from: ___NSAttributedStringByScalingFontSize_block_invoke in TTTAttributedLabel.o "_CTFontCreateWithName", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o _NSAttributedStringAttributesFromLabel in TTTAttributedLabel.o "_CTFontGetSize", referenced from: ___NSAttributedStringByScalingFontSize_block_invoke in TTTAttributedLabel.o "_CTFontGetUnderlineThickness", referenced from: -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CTFrameGetLineOrigins", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o "_CTFrameGetLines", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawBackground:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel drawStrike:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel sizeThatFits:] in TTTAttributedLabel.o "_CTFramesetterCreateFrame", referenced from: -[TTTAttributedLabel characterIndexAtPoint:] in TTTAttributedLabel.o -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o -[TTTAttributedLabel sizeThatFits:] in TTTAttributedLabel.o "_CTFramesetterCreateWithAttributedString", referenced from: -[TTTAttributedLabel framesetter] in TTTAttributedLabel.o -[TTTAttributedLabel drawTextInRect:] in TTTAttributedLabel.o "_CTFramesetterSuggestFrameSizeWithConstraints", referenced from: -[TTTAttributedLabel textRectForBounds:limitedToNumberOfLines:] in TTTAttributedLabel.o -[TTTAttributedLabel sizeThatFits:] in TTTAttributedLabel.o "_CTLineCreateTruncatedLine", referenced from: -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o "_CTLineCreateWithAttributedString", referenced from: -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o "_CTLineDraw", referenced from: -[TTTAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:] in TTTAttributedLabel.o “\u CGAffineTransformity”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “\u CGContextAddLineToPoint”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextAddPath”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 “CGContextFillPath”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 “CGContextMoveToPoint”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextScaleCTM”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “CGContextSetFillColorWithColor”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 “CGContextSetGrayStrokeColor”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextSetLineJoin”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 “CGContextSetLineWidth”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextSetShadowWithColor”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “CGContextSetStrokeColorWithColor”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextSetTextMatrix”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “CGContextSetTextPosition”，引用自： -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 “CGContextStrokePath”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CGContextTranslateCm”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “_cgpathdrect”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 -[TTTAttributedLabel sizeThatFits:]在TTTAttributedLabel.o中 “CGPathCreateMutable”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 -[TTTAttributedLabel sizeThatFits:]在TTTAttributedLabel.o中 “_CGRectContainsPoint”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] “CGRectGetWidth”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “_CGRectInset”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 “_CGRectZero”，引用自： -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “_CGSizeZero”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “CTFontCreateCopyWithAttributes”，引用自： ___NSAttributedStringByScalingFontSize_block_在TTTAttributedLabel.o中调用 “CTFontCreateWithName”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] _TTtatAttributedLabel.o中的NSAttributedStringAttributesFromLabel “CTFontGetSize”，引用自： ___NSAttributedStringByScalingFontSize_block_在TTTAttributedLabel.o中调用 “CTFontGetUnderlineThickness”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CTFrameGetLineOrigins”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] “CTFrameGetLines”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 -[tttatAttributedLabel退税理由：inRect:context:]在tttatAttributedLabel.o中 -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawStrike:inRect:context:] -[TTTAttributedLabel sizeThatFits:]在TTTAttributedLabel.o中 “CTFramesetterCreateFrame”，引用自： -[TTtatAttributedLabel.o中的TTtatAttributedLabel CharacterIndexPoint:] -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 -[TTTAttributedLabel sizeThatFits:]在TTTAttributedLabel.o中 “CTFramesetterCreateWithAttributedString”，引用自： -TTTAttributedLabel.o中的[TTTAttributedLabel框架设置器] -TTtatAttributedLabel.o中的[TTtatAttributedLabel drawTextInRect:] “CTFramesetterSuggestFrameSizeWithConstraints”，引用自： -TTtatAttributedLabel.o中的[TTtatAttributedLabel textRectForBounds:limitedToNumberOfLines:] -[TTTAttributedLabel sizeThatFits:]在TTTAttributedLabel.o中 “_CTLineCreateTruncatedLine”，引用自： -[TTtatAttributedLabel drawFramesetter:attributedString:textRange:inRect:context:]在TTtatAttributedLabel.o中 “\u CTLineCreateWithAttributedString”，引用自： -[TTTAtt