是否有可能在 UILabel
中格式化 text
以显示圆点符号?
如果可以,我该怎么做?
是否有可能在 UILabel
中格式化 text
以显示圆点符号?
如果可以,我该怎么做?
也许你可以在字符串中使用 Unicode 码点来表示项目符号字符?
Objective-C
myLabel.text = @"\u2022 This is a list item!";
Swift 4
myLabel.text = "\u{2022} This is a list item!"
myLabel.numberOfLines = 0
可以让标签支持多行,并且会保留换行符。总的来说,我更喜欢使用 UITextField
,因为它更加灵活。例如,在使用 UITextField
时,您可以轻松检测到用户点击了哪个字符,而我认为您不能使用 UILabel
实现这一点。文本视图还具有许多其他有用的功能。 - John Erckoption+8
。 - atulkhatri只需添加" • "
我也在寻找类似于这样的东西用于我的textView
。 我所做的就是将上述字符串附加到我的字符串中,并将其传递给我的textView
,对于labels
也可以使用相同方法。
我为未来的观众解答了这个问题。
这里有一个使用Swift的好解决方案
let label = UILabel()
label.frame = CGRect(x: 40, y: 100, width: 280, height: 600)
label.textColor = UIColor.lightGray
label.numberOfLines = 0
let arrayString = [
"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
"Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.",
"Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.",
"Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
]
label.attributedText = add(stringList: arrayString, font: label.font, bullet: "")
self.view.addSubview(label)
func add(stringList: [String],
font: UIFont,
bullet: String = "\u{2022}",
indentation: CGFloat = 20,
lineSpacing: CGFloat = 2,
paragraphSpacing: CGFloat = 12,
textColor: UIColor = .gray,
bulletColor: UIColor = .red) -> NSAttributedString {
let textAttributes: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: font, NSAttributedStringKey.foregroundColor: textColor]
let bulletAttributes: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: font, NSAttributedStringKey.foregroundColor: bulletColor]
let paragraphStyle = NSMutableParagraphStyle()
let nonOptions = [NSTextTab.OptionKey: Any]()
paragraphStyle.tabStops = [
NSTextTab(textAlignment: .left, location: indentation, options: nonOptions)]
paragraphStyle.defaultTabInterval = indentation
//paragraphStyle.firstLineHeadIndent = 0
//paragraphStyle.headIndent = 20
//paragraphStyle.tailIndent = 1
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.paragraphSpacing = paragraphSpacing
paragraphStyle.headIndent = indentation
let bulletList = NSMutableAttributedString()
for string in stringList {
let formattedString = "\(bullet)\t\(string)\n"
let attributedString = NSMutableAttributedString(string: formattedString)
attributedString.addAttributes(
[NSAttributedStringKey.paragraphStyle : paragraphStyle],
range: NSMakeRange(0, attributedString.length))
attributedString.addAttributes(
textAttributes,
range: NSMakeRange(0, attributedString.length))
let string:NSString = NSString(string: formattedString)
let rangeForBullet:NSRange = string.range(of: bullet)
attributedString.addAttributes(bulletAttributes, range: rangeForBullet)
bulletList.append(attributedString)
}
return bulletList
}
在Swift 3.1中
lblItemName.text = "\u{2022} This is a list item!"
好的。请复制并粘贴以下符号:•
Swift编译器可以在Xcode中按照需要解释和显示该符号,无需其他操作。
重用
extension String {
static var bullet: String {
return "• "
}
}
print(String.bullet + "Buy apples")
let secondPoint: String = .bullet + "Buy oranges"
print(secondPoint)
输出
• Buy apples
• Buy oranges
可重复使用的数组
extension Array where Element == String {
var bulletList: String {
var po = ""
for (index, item) in self.enumerated() {
if index != 0 {
po += "\n"
}
po += .bullet + item
}
return po
}
}
print(["get apples", "get oranges", "get a bannana"].bulletList)
输出
• get apples
• get oranges
• get a bannana
如果你想对项目符号的文本缩进进行对齐,你可以使用以下方法,该方法构建了一个具有适当缩进和间距属性的NSAttributedString
:
- (NSAttributedString *)attributedStringForBulletTexts:(NSArray *)stringList
withFont:(UIFont *)font
bulletString:(NSString *)bullet
indentation:(CGFloat)indentation
lineSpacing:(CGFloat)lineSpacing
paragraphSpacing:(CGFloat)paragraphSpacing
textColor:(UIColor *)textColor
bulletColor:(UIColor *)bulletColor {
NSDictionary *textAttributes = @{NSFontAttributeName: font,
NSForegroundColorAttributeName: textColor};
NSDictionary *bulletAttributes = @{NSFontAttributeName: font, NSForegroundColorAttributeName: bulletColor};
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.tabStops = @[[[NSTextTab alloc] initWithTextAlignment: NSTextAlignmentLeft location:indentation options:@{}]];
paragraphStyle.defaultTabInterval = indentation;
paragraphStyle.lineSpacing = lineSpacing;
paragraphStyle.paragraphSpacing = paragraphSpacing;
paragraphStyle.headIndent = indentation;
NSMutableAttributedString *bulletList = [NSMutableAttributedString new];
for (NSString *string in stringList) {
NSString *formattedString = [NSString stringWithFormat:@"%@\t%@\n", bullet, string];
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:formattedString];
if (string == stringList.lastObject) {
paragraphStyle = [paragraphStyle mutableCopy];
paragraphStyle.paragraphSpacing = 0;
}
[attributedString addAttributes:@{NSParagraphStyleAttributeName: paragraphStyle} range:NSMakeRange(0, attributedString.length)];
[attributedString addAttributes:textAttributes range:NSMakeRange(0, attributedString.length)];
NSRange rangeForBullet = [formattedString rangeOfString:bullet];
[attributedString addAttributes:bulletAttributes range:rangeForBullet];
[bulletList appendAttributedString:attributedString];
}
return bulletList;
}
您可以按照以下方式使用该方法,通过传递一个包含文本的 NSArray
并提供已经有一个 UILabel
:
NSArray *stringArray = @[@"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
@"Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.",
@"Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.",
@"Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
];
label.attributedText = [self attributedStringForBulletTexts:stringArray
withFont:label.font
bulletString:@"•"
indentation:15
lineSpacing:2
paragraphSpacing:10
textColor:UIColor.blackColor
bulletColor:UIColor.grayColor];
NSString *lineWrap = string == stringList.lastObject ? @"" : @"\n"; NSString *formattedString = [NSString stringWithFormat:@"%@\t%@%@", bullet, string, lineWrap];
- Vincent Sit请查看此链接,我制作了一个自定义视图,以符号(使用UILabel的attributeText属性)格式化文本为列表项符号(Swift 3.0)。 https://github.com/akshaykumarboth/SymbolTextLabel-iOS-Swift
import UIKit
class ViewController: UIViewController {
@IBOutlet var symbolView: SymbolTextLabel!
var testString = "Understanding the concept of sales"
var bulletSymbol = "\u{2022}"
var fontsize: CGFloat= 18
override func viewDidLoad() {
super.viewDidLoad()
//First way // Dynamically creating SymbolTextLabel object
let symbolTextLabel = SymbolTextLabel(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
symbolTextLabel.setText(text: testString, symbolCode: bulletSymbol) //setting text and symbol of text item
symbolTextLabel.setFontSize(textSize: fontsize) // setting font size
//symbolTextLabel.setSpacing(spacing: 5) // setting space between symbol and text
self.view.addSubview(symbolTextLabel)
//second way // from storyboard or interface builder
symbolView.setText(text: testString, symbolCode: bulletSymbol)
//setting text and symbol of text item
symbolView.setFontSize(textSize: fontsize) // setting font size
//symbolView.setSpacing(spacing: 5) // setting space between symbol and text
}
}
NSAttributedString
扩展:import UIKit
public extension NSAttributedString {
static func makeBulletList(from strings: [String],
bulletCharacter: String = "\u{2022}",
bulletAttributes: [NSAttributedString.Key: Any] = [:],
textAttributes: [NSAttributedString.Key: Any] = [:],
indentation: CGFloat = 20,
lineSpacing: CGFloat = 1,
paragraphSpacing: CGFloat = 10) -> NSAttributedString
{
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.defaultTabInterval = indentation
paragraphStyle.tabStops = [
NSTextTab(textAlignment: .left, location: indentation)
]
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.paragraphSpacing = paragraphSpacing
paragraphStyle.headIndent = indentation
let bulletList = NSMutableAttributedString()
for string in strings {
let bulletItem = "\(bulletCharacter)\t\(string)\n"
var attributes = textAttributes
attributes[.paragraphStyle] = paragraphStyle
let attributedString = NSMutableAttributedString(
string: bulletItem, attributes: attributes
)
if !bulletAttributes.isEmpty {
let bulletRange = (bulletItem as NSString).range(of: bulletCharacter)
attributedString.addAttributes(bulletAttributes, range: bulletRange)
}
bulletList.append(attributedString)
}
if bulletList.string.hasSuffix("\n") {
bulletList.deleteCharacters(
in: NSRange(location: bulletList.length - 1, length: 1)
)
}
return bulletList
}
}
extension UILabel{
func setBulletAttributes(bullet:String , text:String){
var attributes = [NSAttributedString.Key: Any]()
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.headIndent = (bullet as NSString).size(withAttributes: attributes).width
attributes[.paragraphStyle] = paragraphStyle
self.attributedText = NSAttributedString(string: text, attributes: attributes)
}
然后调用它:
var bullet = "* "
self.label.setBulletAttributes(bullet:bullet, text: bullet + "Test *****")
UILabel
不会将其文本视为HTML。 - Ben ZottoALT+8 = •
。 - TheTiger