iOS 6上的NSTextAlignmentJustified到UILable textAligment将会崩溃

我现在使用 Xcode4.5和iOS6,iOS6已经改变了UILable的textAlignment,

label.textAlignment = NSTextAlignmentJustified;

该代码将在使用ios6 SDK的iPhone 6.0 Simulator上崩溃.但不会在iPhone 5.0模拟器与iOS6 SDK崩溃.

iOS6支持NSTextAlignmentJustified,但为什么会崩溃？

解决方法

编辑1：

使用NSAttributedString我们可以证明文本.

NSMutableParagraphStyle *paragraphStyles = [[NSMutableParagraphStyle alloc] init];
paragraphStyles.alignment                = NSTextAlignmentJustified;
paragraphStyles.firstLineHeadIndent      = 0.05;    // Very IMP

NSString *stringTojustify                = @"We are what our thoughts have made us; so take care about what you think. Words are secondary. Thoughts live; they travel far.";
NSDictionary *attributes                 = @{NSParagraphStyleAttributeName: paragraphStyles};
NSAttributedString *attributedString     = [[NSAttributedString alloc] initWithString:stringTojustify attributes:attributes];

self.lblQuote.attributedText             = attributedString;
self.lblQuote.numberOfLines              = 0;
[self.lblQuote sizeToFit];

UITextAlignmentJustify的弃用,在iOS 6下不再可用.

在这个SO link也提供了所有可能的解决方案
看看this page和iOS6 prerelease Documentation.