UIButton上的iOS NSAttributedString

我使用的是iOS 6 ，所以属性string应该很容易使用，对吧？ 那么…不是那么多。

我想做的事：

使用UIButton的自定义子类（它不会做任何自定义titleLabel ），我想有一个多行，归因的标题是：

1. 所有大写（我意识到这不是属性的一部分）在第一行
2. 在第一行粘贴
3. 在第一行加下划线
4. 第二行的“正常”重量
5. 第二行没有下划线
6. 以两条线为中心

到目前为止，我已经能够获得＃1至5（至less，我以为我做了，但是目前的testing正在产生多行文本的错误），但是当我试图做某件事（任何事情！文字要居中，我的应用程序不断崩溃。 当我试图让所有6个项目（通过各种方法）工作，我得到以下崩溃/错误：

 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.' 

根据我所尝试的，似乎我可以有以下选项之一，但不能同时使用这两个选项：

1. 多线，居中的标签
2. 归属标签

如果必须的话 ，我可以和其中一个人住在一起，但我不能相信我不能有一个相当直接的概念。

有人可以告诉我我错了什么吗？

这是我正在尝试的代码的最后一个迭代：

 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]; 

Answer 1

它看起来像你忘记了在你的代码中使用你设置的“样式”对象..你刚刚实例化它。 你应该修改你的代码如下所示：

 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。其他一切都是一样的..这就是我得到的button：

这里是在Swift 3.0中

 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 

Answer 2

使用Swift 4，您可以使用下面的UIButton子类实现来解决您的问题：

 import UIKit class CustomButton: UIButton { required init(title: String, subtitle: String) { super.init(frame: CGRect.zero) let style = NSMutableParagraphStyle() style.alignment = NSTextAlignment.center style.lineBreakMode = NSLineBreakMode.byWordWrapping let titleAttributes: [NSAttributedStringKey : Any] = [ NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue, NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: UIFontTextStyle.largeTitle), NSAttributedStringKey.paragraphStyle : style ] let subtitleAttributes = [ NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: UIFontTextStyle.body), NSAttributedStringKey.paragraphStyle : style ] let attributedString = NSMutableAttributedString(string: title, attributes: titleAttributes) attributedString.append(NSAttributedString(string: "\n")) attributedString.append(NSAttributedString(string: subtitle, attributes: subtitleAttributes)) setAttributedTitle(attributedString, for: UIControlState.normal) titleLabel?.numberOfLines = 0 titleLabel?.lineBreakMode = NSLineBreakMode.byWordWrapping } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } } 

用法：

 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let button = CustomButton(title: "Title", subtitle: "Subtitle") button.translatesAutoresizingMaskIntoConstraints = false view.addSubview(button) let horizontalConstraint = button.centerXAnchor.constraint(equalTo: view.centerXAnchor) let verticalConstraint = button.centerYAnchor.constraint(equalTo: view.centerYAnchor) NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint]) } } 

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作为替代scheme，如果您确实需要systemtypes的button，则可以使用以下代码：

 import UIKit extension UIButton { static func customSystemButton(title: String, subtitle: String) -> UIButton { let style = NSMutableParagraphStyle() style.alignment = NSTextAlignment.center style.lineBreakMode = NSLineBreakMode.byWordWrapping let titleAttributes: [NSAttributedStringKey : Any] = [ NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue, NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: UIFontTextStyle.largeTitle), NSAttributedStringKey.paragraphStyle : style ] let subtitleAttributes = [ NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: UIFontTextStyle.body), NSAttributedStringKey.paragraphStyle : style ] let attributedString = NSMutableAttributedString(string: title, attributes: titleAttributes) attributedString.append(NSAttributedString(string: "\n")) attributedString.append(NSAttributedString(string: subtitle, attributes: subtitleAttributes)) let button = UIButton(type: UIButtonType.system) button.setAttributedTitle(attributedString, for: UIControlState.normal) button.titleLabel?.numberOfLines = 0 button.titleLabel?.lineBreakMode = NSLineBreakMode.byWordWrapping return button } } 

用法：

 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let button = UIButton.customSystemButton(title: "Title", subtitle: "Subtitle") button.translatesAutoresizingMaskIntoConstraints = false view.addSubview(button) let horizontalConstraint = button.centerXAnchor.constraint(equalTo: view.centerXAnchor) let verticalConstraint = button.centerYAnchor.constraint(equalTo: view.centerYAnchor) NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint]) } } 

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下面的两个屏幕截图显示了UIButton子类（左侧）和systemtypesbutton（右侧）的结果显示：