DDProgressView
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rect.size.width is null
Assertion failed: (CGFloatIsValid(x2) && CGFloatIsValid(y2)), function void CGPathAddArcToPoint(CGMutablePathRef, const CGAffineTransform *, CGFloat, CGFloat, CGFloat, CGFloat, CGFloat), file Paths/CGPath.cc, line 354.
http://i.imgur.com/aVYq2NV.png