UIButton上的iOS NSAttributedString [英] iOS NSAttributedString on UIButton

问题描述

我正在使用 iOS 6 ，因此归因字符串应该易于使用，对吧？好吧......没那么多。

I'm using iOS 6, so attributed strings should be easy to use, right? Well... not so much.

我想做什么：

使用<的自定义子类code> UIButton （它没有做任何自定义 titleLabel ），我想有一个多行，归因于标题是：

Using a custom subclass of UIButton (it doesn't do anything custom to titleLabel), I'd like to have a multi-line, attributed title that is:

1. 第一行上的所有上限（我意识到这不是属性的一部分）

第一行
2. 粗体


3. 第一行带下划线


4. 正常的第二行重量


5. 第二行没有下划线


6. 以两行为中心

1. All caps (I realize that's not part of the attributes) on the first line
2. Bolded on the first line
3. Underlined on the first line
4. "Normal" weight on the second line
5. Non-underlined on the second line
6. Centered on both lines

到目前为止，我已经能够获得＃1到5（至少，我认为我做过，但目前的测试是多线文本产生错误），但当我尝试做某事（任何东西！）以使文本居中时，我的应用程序一直在崩溃。当我试图让所有6个项目都工作时（通过各种方法），我得到以下崩溃/错误：

I've been able to get #'s 1 through 5 so far (at least, I thought I did, but current testing is yielding errors with multi-line text), but when I tried to do something (anything!) to get the text to be centered, my app keeps crashing. When I try to get all 6 items working (through various methods), I get the following crash/error:

Terminating app due to uncaught exception 
'NSInternalInconsistencyException', reason: 
'NSAttributedString invalid for autoresizing, 
it must have a single spanning paragraph style
(or none) with a non-wrapping lineBreakMode.'

根据我的尝试，看来我可以选择以下选项之一，但不是两个：

Based on what I've tried, it appears that I can have one of the following options, but not both:

1. 多行，居中的标签


2. 属性标签

如果我必须，我可以和其他人一起生活，但我不相信我不能有什么似乎是一个相当简单的概念。

I can live with one or the other if I must, but I can't believe that I can't have what seems to be a fairly straightforward concept.

有人可以告诉我我的错误吗？

Can someone please tell me what I've got wrong?

这是我正在尝试的代码的最后一次迭代：

Here's the last iteration of the code I'm trying:

NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[style setAlignment:NSTextAlignmentCenter];
[style setLineBreakMode:NSLineBreakByWordWrapping];

UIFont *font1 = [UIFont fontWithName:@"HelveticaNeue-Medium" size:20.0f];
UIFont *font2 = [UIFont fontWithName:@"HelveticaNeue-Light"  size:20.0f];
NSDictionary *dict1 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),  
                        NSFontAttributeName:font1};
NSDictionary *dict2 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleNone),    
                        NSFontAttributeName:font2};

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init];
[attString appendAttributedString:[[NSAttributedString alloc] initWithString:@"LINE 1\n"    attributes:dict1]];
[attString appendAttributedString:[[NSAttributedString alloc] initWithString:@"line 2"      attributes:dict2]];
[[self buttonToStyle] setAttributedTitle:attString forState:UIControlStateNormal];
[[[self buttonToStyle] titleLabel] setNumberOfLines:0];
[[[self buttonToStyle] titleLabel] setLineBreakMode:NSLineBreakByWordWrapping];

推荐答案

在我看来你忘了你的代码使用您设置的样式对象..您只是实例化它。您应该修改您的代码，如下所示：

It looks to me like you forgot in your code to use the "style" object that you set up.. you just instantiated it. You should modify your code to look like this:

NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[style setAlignment:NSTextAlignmentCenter];
[style setLineBreakMode:NSLineBreakByWordWrapping];

UIFont *font1 = [UIFont fontWithName:@"HelveticaNeue-Medium" size:20.0f];
UIFont *font2 = [UIFont fontWithName:@"HelveticaNeue-Light"  size:20.0f];
NSDictionary *dict1 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),
                        NSFontAttributeName:font1,
                        NSParagraphStyleAttributeName:style}; // Added line
NSDictionary *dict2 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleNone),
                        NSFontAttributeName:font2,
                        NSParagraphStyleAttributeName:style}; // Added line

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init];
[attString appendAttributedString:[[NSAttributedString alloc] initWithString:@"LINE 1\n"    attributes:dict1]];
[attString appendAttributedString:[[NSAttributedString alloc] initWithString:@"line 2"      attributes:dict2]];
[self.resolveButton setAttributedTitle:attString forState:UIControlStateNormal];
[[self.resolveButton titleLabel] setNumberOfLines:0];
[[self.resolveButton titleLabel] setLineBreakMode:NSLineBreakByWordWrapping];

请注意，我只添加了定义NSParagraphStyleAttributeName的行..其他一切都相同..和这就是我得到的按钮：

Note that I only added the lines that define the NSParagraphStyleAttributeName.. everything else is the same.. and this is what I get for the button:

这里是Swift 3.0

And here it is in Swift 3.0

let style = NSMutableParagraphStyle()
style.alignment = .center
style.lineBreakMode = .byWordWrapping

guard
    let font1 = UIFont(name: "HelveticaNeue-Medium", size: 20),
    let font2 = UIFont(name: "HelveticaNeue-Light", size: 20)  else { return }

let dict1:[String:Any] = [
    NSUnderlineStyleAttributeName:NSUnderlineStyle.styleSingle.rawValue,
    NSFontAttributeName:font1,
    NSParagraphStyleAttributeName:style
]

let dict2:[String:Any] = [
    NSUnderlineStyleAttributeName:NSUnderlineStyle.styleNone.rawValue,
    NSFontAttributeName:font2,
    NSParagraphStyleAttributeName:style
]

let attString = NSMutableAttributedString()
attString.append(NSAttributedString(string: "LINE 1", attributes: dict1))
attString.append(NSAttributedString(string: "line 2", attributes: dict2))

button.setAttributedTitle(attString, for: .normal)
button.titleLabel?.numberOfLines = 0
button.titleLabel?.lineBreakMode = .byWordWrapping

这篇关于UIButton上的iOS NSAttributedString的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！