iOS 7模拟器错误 - NSAttributedString不会出现

问题描述

我想我发现了一个bug iOS 7模拟器，其中未显示NSAttributedString。如果其他人可以测试这个以确认它是一个错误，那将是很好的，然后我将向Apple提交一个错误。

I think I have found a bug in the iOS 7 Simulator where a NSAttributedString does not appear. It would be great if someone else could test this to confirm it is a bug, then I will file a bug with Apple.

问题似乎是使用的组合NSAderlineStyleAttributeName和NSAttributedString的NSParagraphStyleAttributeName。

The problem appears to be the combination of using NSUnderlineStyleAttributeName and NSParagraphStyleAttributeName for NSAttributedString.

以下是重现的步骤：

1）在Xcode 5中创建一个新的单一视图应用程序。无论如何都要调用它。

1) In Xcode 5 create a new 'Single View Application'. Call it whatever.

2）在ViewController.m中，将viewDidLoad方法替换为：

2) In ViewController.m, replace the viewDidLoad method with:

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSMutableParagraphStyle* paragraph = [[NSMutableParagraphStyle alloc] init];
    paragraph.alignment = NSTextAlignmentCenter;

    NSAttributedString* attrStr = [[NSAttributedString alloc] initWithString:@"Lorem ipsum dolor sit" attributes:
                                   @{NSUnderlineStyleAttributeName:@1,
                                     NSParagraphStyleAttributeName:paragraph}];

    UILabel* myLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 0, 0)];
    myLabel.backgroundColor = [UIColor greenColor];
    myLabel.attributedText = attrStr;
    [myLabel sizeToFit];

    [self.view addSubview:myLabel];
}

3）在iOS 7设备上运行，然后在iOS中再次运行7模拟器。

3) Run on an iOS 7 device and then run it again in the iOS 7 simulator.

4）最后，将部署目标设置为iOS 6并在iOS 6模拟器上运行。

4) Lastly, set the deployment target to iOS 6 and run it on the iOS 6 simulator.

结果应如下所示

• iOS 7设备：正确显示


• iOS 7模拟器：仅显示标签背景


• iOS 6模拟器：正确显示

屏幕截图：


iOS7设备

iOS7模拟器

iOS7 Simulator

推荐答案

看来这不是模拟器错误，而是iOS 7 bug，因为我现在能够在设备上重现它。我在这里创建了一个新问题：

It appears this is not a Simulator bug, but an iOS 7 bug as I have been able to reproduce it on a device now. I have created a new question for it here: iOS 7 BUG - NSAttributedString does not appear

该错误似乎是使用NSUnderlineStyleAttributeName& NSParagraphStyleAttributeName作为NSAttributedString的属性。

The bug appears to be the combination of using NSUnderlineStyleAttributeName & NSParagraphStyleAttributeName as attributes for a NSAttributedString.

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