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我使用 uitextview 输入文本多行，并限制文本输入行。在iOS7中，输入全文和输入多阶段字符（日语）时，应用程序会崩溃。（我不能重复这个问题，但我的客户说，它在 Crashlytics 中显示错误，如下图所示）

来自 Crashlytics 的崩溃日志图片

我无法调试，因为在测试模拟器中它不会崩溃。这是我在下面设置文本限制行的代码：

- (BOOL) textView:(UITextView *)textViewshouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {   

    CGRect textRect = [textView.layoutManager usedRectForTextContainer:textView.textContainer];
    CGFloat sizeAdjustment = textView.font.lineHeight * [UIScreen mainScreen].scale;

    //------------------fix num line-----------------------------
    NSLayoutManager *layoutManager = [textView layoutManager];
    unsigned numberOfLines, index, numberOfGlyphs = [layoutManager numberOfGlyphs];

    NSRange lineRange;

    for (numberOfLines=0, index=0; index < numberOfGlyphs; numberOfLines++) {
        [layoutManager lineFragmentRectForGlyphAtIndex:index
                                        effectiveRange:&lineRange];
        index = NSMaxRange(lineRange);
    }

    if (textRect.size.height >= textView.frame.size.height - textView.contentInset.bottom - sizeAdjustment) {
        if ([text isEqualToString:@"\n"] && numberOfLines < MAX_NUMBER_OF_LINES_ALLOWED-1) {
            [UIView animateWithDuration:0.2 animations:^{
                [textView setContentOffset:CGPointMake(textView.contentOffset.x, textView.contentOffset.y + sizeAdjustment)];
            }];
        }
    }

    [textView scrollRangeToVisible:textView.selectedRange];

    if(numberOfLines < MAX_NUMBER_OF_LINES_ALLOWED) {
        if([text isEqualToString:@"\n"] && numberOfLines == MAX_NUMBER_OF_LINES_ALLOWED-1) {
            return NO;
        } else {
            return numberOfLines < MAX_NUMBER_OF_LINES_ALLOWED;
        }
    } else {
        return NO;
    }  
}

-(void)textViewDidChange:(UITextView *)textView { 
    //------------------fix num line-----------------------------
    NSLayoutManager *layoutManager = [textView layoutManager];
    unsigned numberOfLines, index, numberOfGlyphs = [layoutManager numberOfGlyphs];

    NSRange lineRange;

    for (numberOfLines = 0, index = 0; index < numberOfGlyphs; numberOfLines++){
        (void) [layoutManager lineFragmentRectForGlyphAtIndex:index
                                               effectiveRange:&lineRange];
        index = NSMaxRange(lineRange);
    }

    NSLog(@"numberOfLines %d",numberOfLines);

    if (numberOfLines<MAX_NUMBER_OF_LINES_ALLOWED) {
        _tempComment = self.commentTextView.text;
    } else {
        self.commentTextView.text = _tempComment;
    }
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