Xcode 6 [NSString drawInRect：withAttributes：]

Question

我已将我的XCode 5升级到6，但遗憾的是调试器突然停止或此时没有断点的异常。请参阅下面的图片了解更多详情。

这是我使用的示例代码，在以前的版本上运行很好。这有什么问题，我该怎么做才能避免这种例外？

UIFont *font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:20.0f];
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
paragraphStyle.alignment = NSTextAlignmentCenter;

NSDictionary *attributes = @{ NSFontAttributeName: font, NSParagraphStyleAttributeName: paragraphStyle };

[@"Hello" drawInRect:CGRectMake(118, 32, 375, 24) withAttributes:attributes];