ios Swift 4 标签属性
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Swift 4 Label attributes
提问by Blue
I'm moving from swift 3 to swift 4. I have UILabels that I am giving very specific text properties to the label. I'm getting an 'unexpectedly found nil while unwrapping optional value' error when strokeTextAttributes is being initialized. I'm totally lost to be frank.
我正在从 swift 3 转移到 swift 4。我有 UILabels，我为标签提供了非常具体的文本属性。初始化 strokeTextAttributes 时，我收到“在解开可选值时意外发现 nil”错误。坦率地说，我完全迷失了。
In swift 3 the of strokeTextAttributes was [String : Any] but swift 4 threw errors until I changed it to what it is below.
在 swift 3 中，strokeTextAttributes 是 [String : Any] 但 swift 4 抛出错误，直到我将其更改为下面的内容。
let strokeTextAttributes = [
NSAttributedStringKey.strokeColor.rawValue : UIColor.black,
NSAttributedStringKey.foregroundColor : UIColor.white,
NSAttributedStringKey.strokeWidth : -2.0,
NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)
] as! [NSAttributedStringKey : Any]
chevronRightLabel.attributedText = NSMutableAttributedString(string: "0", attributes: strokeTextAttributes)
回答by Xavier Lowmiller
@Larme's comment about the .rawValuenot being needed is correct.
@Larme 关于不需要的评论.rawValue是正确的。
Also, you can avoid the force cast that crashes your code using explicit typing:
此外，您可以使用显式类型避免强制转换导致代码崩溃：
let strokeTextAttributes: [NSAttributedString.Key: Any] = [
.strokeColor : UIColor.black,
.foregroundColor : UIColor.white,
.strokeWidth : -2.0,
.font : UIFont.boldSystemFont(ofSize: 18)
]
This gets rid of the repetitive NSAttributedString.Key., too.
这也摆脱了重复NSAttributedString.Key.。
回答by Krunal
In Swift 4.0+, attributed string accepts json (dictionary) with key type NSAttributedStringKeyor NSAttributedString.Key.
在 中Swift 4.0+，属性字符串接受键类型为NSAttributedStringKey或 的json（字典）NSAttributedString.Key。
So you must change it from [String : Any]to
所以你必须把它从[String : Any]改为
Swift 4.1 & below -[NSAttributedStringKey : Any]&
Swift 4.2 & above -[NSAttributedString.Key : Any]
Swift 4.1 及以下 -[NSAttributedStringKey : Any]&
Swift 4.2 及以上 -[NSAttributedString.Key : Any]
Swift 4.2
斯威夫特 4.2
Initialiser for AttributedStringin Swift 4.2 is changed to [NSAttributedString.Key : Any]?
AttributedStringSwift 4.2 中的初始化程序更改为[NSAttributedString.Key : Any]?
public init(string str: String, attributes attrs: [NSAttributedString.Key : Any]? = nil)
Here is sample working code.
这是示例工作代码。
let label = UILabel()
let labelText = "String Text"
let strokeTextAttributes = [
NSAttributedString.Key.strokeColor : UIColor.black,
NSAttributedString.Key.foregroundColor : UIColor.white,
NSAttributedString.Key.strokeWidth : -2.0,
NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 18)
] as [NSAttributedString.Key : Any]
label.attributedText = NSAttributedString(string: labelText, attributes: strokeTextAttributes)
Swift 4.0
斯威夫特 4.0
Initialiser for AttributedStringin Swift 4.0 is changed to [NSAttributedStringKey : Any]?.
AttributedStringSwift 4.0 中的Initialiser更改为[NSAttributedStringKey : Any]?.
public init(string str: String, attributes attrs: [NSAttributedStringKey : Any]? = nil)
Here is sample working code.
这是示例工作代码。
let label = UILabel()
let labelText = "String Text"
let strokeTextAttributes = [
NSAttributedStringKey.strokeColor : UIColor.black,
NSAttributedStringKey.foregroundColor : UIColor.white,
NSAttributedStringKey.strokeWidth : -2.0,
NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)
] as [NSAttributedStringKey : Any]
label.attributedText = NSAttributedString(string: labelText, attributes: strokeTextAttributes)
Look at this Apple Document, for more info: NSAttributedString - Creating an NSAttributedString Object
查看这个 Apple 文档，了解更多信息：NSAttributedString - 创建一个 NSAttributedString 对象
回答by Vini App
NSAttributedStringKey.strokeColor.rawValueis of typeString
NSAttributedStringKey.strokeColoris of typeNSAttributedStringKey
NSAttributedStringKey.strokeColor.rawValue是类型String
NSAttributedStringKey.strokeColor是类型NSAttributedStringKey
So its unable to convert Stringto NSAttributedStringKey.
You have to use like below:
所以它无法转换String为NSAttributedStringKey. 你必须像下面这样使用：
let strokeTextAttributes: [NSAttributedStringKey : Any] = [
NSAttributedStringKey.strokeColor : UIColor.black,
NSAttributedStringKey.foregroundColor : UIColor.white,
NSAttributedStringKey.strokeWidth : -2.0,
NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)
]
回答by Azharhussain Shaikh
Swift 4 Attributed text with multiple colors
Swift 4 具有多种颜色的属性文本
extension NSMutableAttributedString
{
@discardableResult func DustyOrange(_ text: String, Fontsize : CGFloat) -> NSMutableAttributedString
{
let attrs: [NSAttributedStringKey: Any] = [.font: UIFont(name: "SFUIDisplay-Regular", size: Fontsize)!, NSAttributedStringKey.foregroundColor: UIColor(red: 242.0/255.0, green: 97.0/255.0, blue: 0.0/255.0, alpha: 1.0) ]
let boldString = NSMutableAttributedString(string:text, attributes: attrs)
append(boldString)
return self
}
@discardableResult func WarmGrey(_ text: String, Fontsize : CGFloat) -> NSMutableAttributedString {
let attrs: [NSAttributedStringKey: Any] = [.font: UIFont(name: "SFUIDisplay-Regular", size: Fontsize)!, NSAttributedStringKey.foregroundColor: UIColor(red: 152.0/255.0, green: 152.0/255.0, blue: 152.0/255.0, alpha: 1.0) ]
let boldString = NSMutableAttributedString(string:text, attributes: attrs)
append(boldString)
return self
}
}
Now you can Execute the function something like this to use as a globally
现在您可以执行类似这样的函数以用作全局
func FormattedString(Orange : String, WarmGrey : String ,fontsize : CGFloat) -> NSMutableAttributedString
{
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .left
paragraphStyle.lineSpacing = 1
paragraphStyle.paragraphSpacing = 1
let formattedString = NSMutableAttributedString()
formattedString
.DustyOrange(Orange, Fontsize: fontsize)
.WarmGrey(WarmGrey, Fontsize: fontsize )
formattedString.addAttributes([NSAttributedStringKey.paragraphStyle: paragraphStyle], range: NSRange(location: 0, length: formattedString.length))
return formattedString
}
You can use globalized function like this
您可以像这样使用全球化函数
yourLabelName.attributedText = FormattedString(Orange: "String with orange color", WarmGrey: " String with warm grey color.", fontsize: 11.5)
Attributed text with image
带有图像的属性文本
func AttributedTextwithImgaeSuffix(AttributeImage : UIImage , AttributedText : String , buttonBound : UIButton) -> NSMutableAttributedString
{
let fullString = NSMutableAttributedString(string: AttributedText + " ")
let image1Attachment = NSTextAttachment()
image1Attachment.bounds = CGRect(x: 0, y: ((buttonBound.titleLabel?.font.capHeight)! -
AttributeImage.size.height).rounded() / 2, width:
AttributeImage.size.width, height: AttributeImage.size.height)
image1Attachment.image = AttributeImage
let image1String = NSAttributedString(attachment: image1Attachment)
fullString.append(image1String)
fullString.append(NSAttributedString(string: ""))
return fullString
}
you can use "NSTextAttachment" with your button label like this.
您可以像这样使用带有按钮标签的“NSTextAttachment”。
yourUIButton.setAttributedTitle(AttributedTextwithImgaeSuffix(AttributeImage: desiredImage, AttributedText: "desired UIButton title", buttonBound: yourUIButton), for: .normal)
回答by Arunabh Das
In Swift 4.x, this should look like :
在 Swift 4.x 中，这应该是这样的：
let strokeTextAttributes: [NSAttributedStringKey: Any] = [
NSStrokeColorAttributeName: UIColor.black,
NSForegroundColorAttributeName : UIColor.white,
NSStrokeWidthAttributeName : -2.0,
NSFontAttributeName : UIFont.boldSystemFont(ofSize: 18)
]
回答by Priya Gupta
if you want to change particular string value so that below answer is helpful you:-
如果您想更改特定的字符串值，以便以下答案对您有所帮助：-
let subStr = "Hello" let allStr = "Hello World"
let subStr = "Hello" let allStr = "Hello World"
let newStr = NSMutableAttributedString(string: allStr)
newStr.addAttribute(kCTFontAttributeName as NSAttributedStringKey, value: UIFont.init(customFont: .MyriadPro_R, withSize: 18)!, range: (allStr as NSString).range(of: subStr))
newStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.PrimaryColor, range: (allStr as NSString).range(of: subStr))
self.stateLbl.attributedText = newStr
回答by Danut Pralea
let text = systolicString + " / " + diastolicString
let newStr = NSMutableAttributedString(string: text)
// I have static ranges, but you can also extract them dynamically
let systolicRange = NSRange(location: 0, length: 2)
let backslashRange = NSRange(location: 3, length: 1)
let diastolicRange = NSRange(location: 5, length: 2)
newStr.addAttribute(NSAttributedStringKey.font, value: UIFont.ubuntuRegular(28), range: systolicRange)
newStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor(hexString: "042f57"), range: systolicRange)
newStr.addAttribute(NSAttributedStringKey.font, value: UIFont.ubuntuLight(23), range: backslashRange)
newStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor(hexString: "6485a3"), range: backslashRange)
newStr.addAttribute(NSAttributedStringKey.font, value: UIFont.ubuntuRegular(18), range: diastolicRange)
newStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor(hexString: "042f57"), range: diastolicRange)
// my UILabel
valueLabel.attributedText = newStr
