异常描述：

在绘制NSString时，

NSTextAlignmentJustified和NSTextAlignmentNatural是无效的对齐值（空值）（
0 CoreFoundation 0x00aa702e exceptionPreprocess + 206
1 libobjc.A.dylib 0x03152e7e objc_exception_throw + 44
2 CoreFoundation 0x00aa6deb + [NSException raise：format：] + 139
3 UIKit 0x022ea8ec - [NSString（UIStringDrawing）_drawInRect：withFont：lineBreakMode：alignment：lineSpacing：includeEmoji：truncationRect：] + 88
4 UIKit 0x022ea88f - [NSString（UIStringDrawing）drawInRect：withFont：lineBreakMode：alignment：lineSpacing：includeEmoji：] + 99
5 UIKit 0x022ea827 - [NSString（UIStringDrawing）drawInRect：withFont：lineBreakMode：alignment：lineSpacing：] + 91
6 UIKit 0x0241ce73 - [UILabel _legacy_drawTextInRect：baselineCalculationOnly：] + 3433
7 UIKit 0x0241cf76 - [UILabel _drawTextInRect：baselineCalculationOnly：] + 160
8 UIKit 0x0241bcd9 - [UILabel drawTextInRect：] + 548
9 UIKit 0x0241e098 - [UILabel drawRect：] + 98
10 UIKit 0x0230fe6e - [UIView（CALayerDelegate）drawLayer：inContext：] + 504
11 QuartzCore 0x0340ba3f - [CALayer drawInContext：] + 128
12 QuartzCore 0x0340b96b _ZL16backing_callbackP9CGContextPv + 96
13 QuartzCore 0x0331d723 CABackingStoreUpdate_ + 2703
14 QuartzCore 0x0340b83c _ZN2CA5Layer8display_Ev + 1406
15 QuartzCore 0x0340b9ba - [CALayer _display] + 33
16 QuartzCore 0x0340b2b6 _ZN2CA5Layer7displayEv + 152
17 QuartzCore 0x0340b994 - [CALayer显示] + 33
18 QuartzCore 0x034000e2 _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 328
19 QuartzCore 0x0340015c _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 38
20 QuartzCore 0x0337e0bc _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 324
21 QuartzCore 0x0337f227 _ZN2CA11Transaction6commitEv + 395
22 QuartzCore 0x0337f8e2 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 96
23 CoreFoundation 0x00a6fafe __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 30
24 CoreFoundation 0x00a6fa3d __CFRunLoopDoObservers + 381
25 CoreFoundation 0x00a4d7c2 __CFRunLoopRun + 1106
26 CoreFoundation 0x00a4cf44 CFRunLoopRunSpecific + 276
27 CoreFoundation 0x00a4ce1b CFRunLoopRunInMode + 123
28 GraphicsServices 0x044bc7e3 GSEventRunModal + 88
29 GraphicsServices 0x044bc668 GSEventRun + 104
30 UIKit 0x022bfffc UIApplicationMain + 1211
31 DirectSeller 0x0000548d main + 141
32 libdyld.dylib 0x03a2470d start + 1 ）

我从未将对齐设置为“NSTextAlignmentJustified”或“NSTextAlignmentNatural”。我无法理解。

自动高度代码：

DSBasicInfoPrototypeCell * cell = [tableView dequeueReusableCellWithIdentifier：@“BasicCell”]; NSString * titleText = data [@“title”];

    NSMutableAttributedString *titleAttributedText = [[NSMutableAttributedString alloc] initWithString:titleText];
    NSMutableParagraphStyle *titleParagraphStyle = [[NSMutableParagraphStyle alloc] init];
    [titleParagraphStyle setLineSpacing:3.0f];
    titleParagraphStyle.alignment = NSTextAlignmentLeft;
    [titleAttributedText addAttribute:NSParagraphStyleAttributeName value:titleParagraphStyle range:NSMakeRange(0, titleText.length)];
    cell.titleLabel.attributedText = titleAttributedText;

    cell.titleLabel.preferredMaxLayoutWidth = 280;
    [cell.titleLabel setText:data[@"title"]];
    [cell.leftSubtitleLabel setText:data[@"source"]];
    [cell.rightSubtitleLabel setText:data[@"time"]];

    [cell setNeedsUpdateConstraints];
    [cell updateConstraintsIfNeeded];
    [cell.contentView setNeedsLayout];
    [cell.contentView layoutIfNeeded];

    return [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;

最后，为我糟糕的英语道歉。

Answer 1

＆＃39; ave设法通过为段落指定文本对齐方式在iOS 6上解决此问题（不将其保留为默认值）：

paragraphStyle.alignment = NSTextAlignmentLeft;

希望它也适合你。

Answer 2

我有同样的问题，我无法找到根本原因。我相信它与在属性文本中使用ParagraphStyle有关。

我的解决方法是检查操作系统版本，如果它低于7.0版，我会使用标准文本而不是AttributedText。

不是最好的解决方案，但它至少让我的应用程序停止在iOS6.1上崩溃，直到找到更好的解决方案。

    NSString* text = @"Text\nText";

    NSString *ver   = [[UIDevice currentDevice] systemVersion];
    float ver_float = [ver floatValue];
    if (ver_float >= 7.0)
    {            
        NSMutableAttributedString* attributedText = [[NSMutableAttributedString alloc] initWithString:text];
        NSMutableParagraphStyle* paragraphStyle   = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.paragraphSpacing           = 6.0f;
        [attributedText addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, text.length)];

        [self.descLabel setAttributedText:attributedText];
    }
    else
    {            
        [self.descLabel setText:@"text"];
    }

表格中的uilabel（对齐异常）的自动高度由NSMutableParagraphStyle提供

异常描述：

2 个答案: