Ios NSAttribute字符串添加文本对齐方式

如何将文本对齐属性添加到NSAttributedString以使文本居中

编辑： 我做错什么了吗？它似乎没有改变对齐方式

CTParagraphStyleSetting setting;
setting.spec = kCTParagraphStyleSpecifierAlignment;
setting.valueSize = kCTCenterTextAlignment;

CTParagraphStyleSetting settings[1] = {
    {kCTParagraphStyleSpecifierAlignment, sizeof(CGFloat), &setting},           
};

CTParagraphStyleRef paragraph = CTParagraphStyleCreate(settings, sizeof(setting));

NSMutableAttributedString *mutableAttributed = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedString];
[mutableAttributed addAttributes:[NSDictionary dictionaryWithObjectsAndKeys:(NSObject*)paragraph ,(NSString*) kCTParagraphStyleAttributeName, nil] range:_selectedRange];

---

由于

NSAttributedString

主要用于iOS上的核心文本，因此必须使用而不是

NSParagraphStyle

。没有可变的变体

例如：

CTTextAlignment alignment = kCTCenterTextAlignment;

CTParagraphStyleSetting alignmentSetting;
alignmentSetting.spec = kCTParagraphStyleSpecifierAlignment;
alignmentSetting.valueSize = sizeof(CTTextAlignment);
alignmentSetting.value = &alignment;

CTParagraphStyleSetting settings[1] = {alignmentSetting};

size_t settingsCount = 1;
CTParagraphStyleRef paragraphRef = CTParagraphStyleCreate(settings, settingsCount);
NSDictionary *attributes = @{(__bridge id)kCTParagraphStyleAttributeName : (__bridge id)paragraphRef};
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:@"Hello World" attributes:attributes];

Swift 4.2

let paragraphStyle: NSMutableParagraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = NSTextAlignment.center

    let attributedString = NSAttributedString(string: "someText", attributes: [NSAttributedString.Key.paragraphStyle : paragraphStyle])

---

我正在搜索相同的问题，并能够通过以下方式将NSAttribute字符串中的文本居中对齐：

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init] ;
[paragraphStyle setAlignment:NSTextAlignmentCenter];

NSMutableAttributedString *attribString = [[NSMutableAttributedString alloc]initWithString:string];
[attribString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [string length])];

Swift 4.0+ Swift 3.0+ （原始答复如下）

Swift 2.0+

---

Swift 4回答：

// Define paragraph style - you got to pass it along to NSAttributedString constructor
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center

// Define attributed string attributes
let attributes = [NSAttributedStringKey.paragraphStyle: paragraphStyle]

let attributedString = NSAttributedString(string:"Test", attributes: attributes)

在swift 4中：

    let paraStyle = NSMutableParagraphStyle.init()
    paraStyle.alignment = .left

    let str = "Test Message"
    let attribute = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 12)]

    let attrMessage = NSMutableAttributedString(string: str, attributes: attribute)


    attrMessage.addAttribute(kCTParagraphStyleAttributeName as NSAttributedStringKey, value: paraStyle, range: NSMakeRange(0, str.count))

---

Xamarin.iOS

NSMutableParagraphStyle paragraphStyle = new NSMutableParagraphStyle();
paragraphStyle.HyphenationFactor = 1.0f;
var hyphenAttribute = new UIStringAttributes();
hyphenAttribute.ParagraphStyle = paragraphStyle;
var attributedString = new NSAttributedString(str: name, attributes: hyphenAttribute);

---

---

如果您使用

UILabel

，只需使用

label.textAlignment=.center

即可

我不使用，我使用名为EGOTextView的库，它会获取一个属性字符串。您创建段落样式的方式有问题。检查我添加的示例，它在EGOTextView中工作，至少它将行显示为居中，但问题似乎有问题，选择不能正确地与居中文本一起工作。是的，它充满了错误，我在过去的4周里一直在用我的头敲击键盘试图修复错误。但这是一个很好的开始，没有它，我不知道从哪里开始使用我的富文本编辑器，谢谢你的回答，它对我很有用。@omz你救了我的工作DThanks@bobby我同意，但我在5年前写了这个答案，而

NSParagraphStyle

在当时的iOS上不可用。请编辑您的答案并格式化代码以使其可读。这不适用于

NSTextAlignmentJustified

。你能告诉我为什么吗？我如何才能将对齐设置为合理？注意：接受的答案在iOS7上对我不起作用，尽管据我所知，它似乎100%正确。这个答案是正确的，当然是更简单的代码：）我和Sam报告的问题是一样的。除了

nstextalignmentjustized

之外，所有对齐都可以。这是一个iOS7错误吗？解决了。只需将NSBaselineOffsetAttributeName:@0添加到属性字典。谢谢它对我也很有用，顺便问一下，synthax

NSAttributeString.alloc到底是什么？这是最好的答案，但是当我问这个问题时，这个答案中使用的API在iOS上是不可用的。有没有办法将其应用于某个特定的范围？是的，通过编辑范围参数
NSMakeRange（0，[string length]）
表示完整的字符串。遗憾的是，与NSAttributedString的draw（）函数不配合使用：NSMakeRange（0，str.count）
let titleParagraphStyle = NSMutableParagraphStyle()
titleParagraphStyle.alignment = .center

let titleFont = UIFont.preferredFont(forTextStyle: UIFontTextStyle.headline)
let title = NSMutableAttributedString(string: "You Are Registered", 
    attributes: [NSFontAttributeName:titleFont,    
    NSForegroundColorAttributeName:UIColor.red, 
    NSParagraphStyleAttributeName: titleParagraphStyle])

let titleParagraphStyle = NSMutableParagraphStyle()
titleParagraphStyle.alignment = .Center

let titleFont = UIFont.preferredFontForTextStyle(UIFontTextStyleHeadline)
let title = NSMutableAttributedString(string: "You Are Registered",
    attributes:[NSFontAttributeName:titleFont,   
    NSForegroundColorAttributeName:UIColor.redColor(), 
    NSParagraphStyleAttributeName: titleParagraphStyle])

// Define paragraph style - you got to pass it along to NSAttributedString constructor
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center

// Define attributed string attributes
let attributes = [NSAttributedStringKey.paragraphStyle: paragraphStyle]

let attributedString = NSAttributedString(string:"Test", attributes: attributes)

    let paraStyle = NSMutableParagraphStyle.init()
    paraStyle.alignment = .left

    let str = "Test Message"
    let attribute = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 12)]

    let attrMessage = NSMutableAttributedString(string: str, attributes: attribute)


    attrMessage.addAttribute(kCTParagraphStyleAttributeName as NSAttributedStringKey, value: paraStyle, range: NSMakeRange(0, str.count))

NSMutableParagraphStyle paragraphStyle = new NSMutableParagraphStyle();
paragraphStyle.HyphenationFactor = 1.0f;
var hyphenAttribute = new UIStringAttributes();
hyphenAttribute.ParagraphStyle = paragraphStyle;
var attributedString = new NSAttributedString(str: name, attributes: hyphenAttribute);