属性文本中心对齐

我已经尝试了所有的方法，但似乎不能集中这篇文章。谁能告诉我错误在哪里。

NSMutableParagraphStyle *paragraphStyle = NSMutableParagraphStyle.new;
paragraphStyle.alignment = NSTextAlignmentCenter;
label.attributedText = [[NSAttributedString alloc] initWithString:cell.EventTitle.text attributes:@{NSForegroundColorAttributeName : [UIColor whiteColor],NSParagraphStyleAttributeName:paragraphStyle,NSBaselineOffsetAttributeName : @0,NSFontAttributeName : [UIFont fontWithName:@"BrandonGrotesque-Black" size:34]}];
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You can set the center alignment using this. Remember to set range.

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


NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [string length])];
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To do it in Swift 2.x

let attributeString = NSMutableAttributedString(string: "text")
style.alignment = .Center
attributeString.addAttribute(NSParagraphStyleAttributeName, value: style, range: range)
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Another way:

Swift:

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
let attributedString = NSAttributedString(string: "This will be centered.", attributes: [ NSAttributedString.Key.paragraphStyle: paragraphStyle])

Obj-C:

NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.alignment = NSTextAlignmentCenter;
NSAttributedString *attributedString =  [NSAttributedString.alloc initWithString:@"This will be centered."
attributes: @{NSParagraphStyleAttributeName:paragraphStyle}];
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In Swift

let titleString = "title here"


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


let attributedString = NSAttributedString(
string: titleString,
attributes: [NSParagraphStyleAttributeName: paragraphStyle]
)


titleAttributedLabel.attributedText = attributedString
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In Swift 5

let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center
textView.attributedText = NSAttributedString(string: "String",
attributes: [.paragraphStyle: paragraph])

In Swift-4

let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center


let attributes: [NSAttributedString.Key : Any] = [NSAttributedString.Key.paragraphStyle: paragraph]
let attrString = NSAttributedString(string:"string", attributes: attributes)
textView.attributedText =  attrString

In Swift-3

let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center


let attributes: [String : Any] = [NSParagraphStyleAttributeName: paragraph]
let attrString = NSAttributedString(string:"string", attributes: attributes)
textView.attributedText =  attrString
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In Swift 4

let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center


textView.attributedText = NSAttributedString(string: "string",
attributes: [.paragraphStyle: paragraph])
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Swift4

let attributedString = NSMutableAttributedString(string: "Example text that is centered using a paragraph style. With the ability to change the width between lines.", attributes: [NSAttributedStringKey.font: GothamFont.medium(with: 14)])


let myParagraphStyle = NSMutableParagraphStyle()
myParagraphStyle.alignment = .center // center the text
myParagraphStyle.lineSpacing = 14 //Change spacing between lines
myParagraphStyle.paragraphSpacing = 38 //Change space between paragraphs
attributedString.addAttributes([.paragraphStyle: myParagraphStyle], range: NSRange(location: 0, length: attributedString.length))

Example

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Swift 4+

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


// Swift 4.2++
let attributedString = NSMutableAttributedString(string: "Your String", attributes: [NSAttributedString.Key.paragraphStyle:paragraphStyle])


// Swift 4.1--
let attributedString = NSMutableAttributedString(string: "Your String", attributes: [NSAttributedStringKey.paragraphStyle:paragraphStyle])


let yourLabel = UILabel()
yourLabel.attributedText = attributedString

Objective-C

NSString *string = @"Your String";
NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = NSTextAlignmentCenter;
NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:string attributes: @{NSParagraphStyleAttributeName:paragraphStyle}];
UILabel *label = [[UILabel alloc] init];
label.attributedText = attributedString;
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Sometimes when text is in Arabic or other right align languages then when doing alignment Justified, last line text ends at left side. for this we can add baseWritingDirection below is sample code

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .justified
paragraphStyle.baseWritingDirection = .rightToLeft
attribute.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:range)
txtView.attributedText = attribute
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Set line breakmode, if you set attributed text on UIButton.

Swift 5

let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center
paragraph.lineBreakMode = .byClipping

Objective-C

NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.alignment = NSTextAlignmentCenter;
style.lineBreakMode = NSLineBreakByClipping;
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helper method based on the helpful answers above

public extension NSAttributedString
{
var centered: NSAttributedString
{
let paragraph = NSMutableParagraphStyle()
paragraph.alignment = .center
let m = NSMutableAttributedString(attributedString: self)
m.addAttribute(.paragraphStyle, value: paragraph, range: NSMakeRange(0, length))
return m
}
}

in case you want the Is dotted and Ts crossed el verbositas version

var centered: NSAttributedString {
let paragraphStyle: NSMutableParagraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.center


let attributedString = NSMutableAttributedString(attributedString: self)
attributedString.addAttributes([NSAttributedString.Key.paragraphStyle : paragraphStyle],
range: NSRange(location: 0, length: attributedString.length))
return attributedString
}
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This works for me label.textAlignment = .center


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