iOS7下YYtextView插入YYImage Crash

[mayazhe]

YYtextView插入YYImage 崩溃，目前只在iOS7发现有此问题

我的代码，运行到最后一句崩溃：

YYImage *image = [[YYImage alloc] initWithCGImage:[[asset defaultRepresentation] fullScreenImage]];
DGCloseImageView *imageView = [[DGCloseImageView alloc] initWithImage:image];
imageView.url = ast.url;
imageView.delegate = self;

CGFloat width = kScreenWidth - 8*2;
CGFloat height = image.size.height * width / image.size.width;
CGSize size = CGSizeMake(width, height);

NSMutableAttributedString *attachText = [NSMutableAttributedString yy_attachmentStringWithContent:imageView contentMode:UIViewContentModeScaleAspectFill attachmentSize:size alignToFont:KFont alignment:YYTextVerticalAlignmentCenter];

attachText.yy_font = KFont;
attachText.yy_minimumLineHeight = 30;
[attachText yy_insertString:@"\n" atIndex:0];
[attachText yy_appendString:@"\n"];

NSRange range = _textView.selectedRange;
NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithAttributedString:_textView.attributedText];
[attr insertAttributedString:attachText atIndex:range.location];
_textView.attributedText = attr;

崩溃在 YYTextEffectWindow.m 文件如下代码：

CGPoint center = [dot yy_convertPoint:CGPointMake(CGRectGetWidth(dot.frame) / 2, CGRectGetHeight(dot.frame) / 2) toViewOrWindow:self];
dot.mirror.center = center;

应该是计算出来的frame有问题：
center = (x = NaN, y = NaN)

[ibireme]

Fixed.