I want to set label's line height and I use minimumLineHeight and maximumLineHeight of NSMutableParagraphStyle
extension UILabel {
func setTextWithLineHeight(text: String?, lineHeight: CGFloat) {
if let text = text {
let style = NSMutableParagraphStyle()
style.maximumLineHeight = lineHeight
style.minimumLineHeight = lineHeight
let attributes: [NSAttributedString.Key: Any] = [
.paragraphStyle: style
.baselineOffset: (lineHeight - font.lineHeight) / 4 // added!!️️🤟
]
let attrString = NSAttributedString(string: text,
attributes: attributes)
self.attributedText = attrString
}
}
}
I add .baselineOffset attribute based on a answer NSAttributedString text always sticks to bottom with big lineHeight , because without it, text is sticks to bottom like this.
image
What I want is set text center vertically so using baselineOffset, I solved the problem. However I wonder why it set baseOffline as (attributes.lineHeight - font.lineHeight) / 4 not (attributes.lineHeight - font.lineHeight) / 2
Related
I use "CIAttributedTextImageGenerator" to generate a CIImage from text and then I overlay it on my edited image with "CISourceAtopCompositing" :
// Text to image
let font = UIFont.systemFont(ofSize: 78)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
paragraphStyle.firstLineHeadIndent = 5.0
let shadow = NSShadow()
shadow.shadowColor = UIColor.red
shadow.shadowBlurRadius = 5
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.blue,
.paragraphStyle: paragraphStyle,
.shadow: shadow
]
let attributedQuote = NSAttributedString(string: "General Kenobi", attributes: attributes)
let textGenerationFilter = CIFilter(name: "CIAttributedTextImageGenerator")!
textGenerationFilter.setValue(attributedQuote, forKey: "inputText")
textGenerationFilter.setValue(NSNumber(value: Double(inputSizeFactor)), forKey: "inputScaleFactor")
let textImage = textGenerationFilter.outputImage!.oriented(.right)
finalImage = textImage
.applyingFilter("CISourceAtopCompositing", parameters: [ kCIInputBackgroundImageKey: finalImage])
However, the text image is always in the right bottom corner of my edited image:
How can I set it a custom location? For example, if I want it to be in the bottom right corner, or in the center of the edited image?
You can apply transformations to the image before you composite it over the background:
let transformedText = textImage.transformed(by: CGAffineTransform(translationX: 200, y: 300)
I'm afraid you have to calculate the exact position for centering the image yourself. There's no built-in way to center one image ontop another.
I am trying to get the estimated size of the rectangle required to draw out a NSMutableAttributedString. The numbers that come not does not make any sense to me. I have a UIViewController with a UIlabel (txtField), with a UIlabel.numberOfLines = 3. I would like to estimate the height of this NSMutableAttributedString were i to set UIlabel.numberOfLines= 0.
With reference to the console reading, I do not understand why the estimated height of the rectangle required to draw the entire NSMutableAttributedString is less than that if it were constrained to just 3 lines?
var txtField: UILabel = {
let label = UILabel()
label.numberOfLines = 3
label.translatesAutoresizingMaskIntoConstraints = false
label.lineBreakMode = .byTruncatingTail
return label
}()
override func viewDidLoad() {
super.viewDidLoad()
let content = "Pasture he invited mr company shyness. But when shot real her. Chamber her
observe visited removal six sending himself boy. At exquisite existence if an oh dependent excellent. Are gay head need down draw. Misery wonder enable mutual get set oppose the uneasy. End why melancholy estimating her had indulgence middletons. Say ferrars demands besides her address. Blind going you merit few fancy their. "
let attributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14)]
let attributedString = NSMutableAttributedString.init(string: content, attributes: attributes)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.5
paragraphStyle.lineBreakMode = .byTruncatingTail
attributedString.addAttributes([.paragraphStyle : paragraphStyle], range: NSRange(location: 0, length: attributedString.length))
txtField.attributedText = attributedString
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if let attText = txtField.attributedText{
let size = CGSize.init(width: txtField.frame.width - 20, height: 1000)
let estimatedFrame = attText.boundingRect(with: size, options: .usesLineFragmentOrigin, context: nil)
print("txtField.frame: \(txtField.frame)")
print("estimatedFrame: \(estimatedFrame)")
}
}
CONSOLE:
txtField.frame: (0.0, 0.0, 394.0, 53.333333333333336)
estimatedFrame: (0.0, 0.0, 367.28125, 16.70703125)
This is wrong:
paragraphStyle.lineBreakMode = .byTruncatingTail
Attributed string line breaking is different from label line breaking. Your attributed string needs to have a line break mode that wraps. Otherwise you are measuring the height of just one line.
I am attempting to create text that has an outline. I am currently using SKLabelNode with NSAttributedString, which you can now do in SpriteKit as of iOS 11. The problem is, if the stroke width is too thick, then the outline gets cut off by what appears to be the bounding rectangle of the SKLabelNode. Please see below for the image and code.
extension SKLabelNode {
func addStroke(_ strokeColor:UIColor) {
let font = UIFont(name: self.fontName!, size: self.fontSize)
let attributes:[NSAttributedStringKey:Any] = [.strokeColor: strokeColor, .strokeWidth: 20.0, .font: font!]
let attributedString = NSMutableAttributedString(string: " \(self.text!) ", attributes: attributes)
let label1 = SKLabelNode()
label1.horizontalAlignmentMode = self.horizontalAlignmentMode
label1.text = self.text
label1.zPosition = -1
label1.attributedText = attributedString
self.addChild(label1)
}
}
I looked at expanding the frame of the SKLabelNode serving as the border text, but that is a get-only property. I tried to add leading/trailing spaces, but they appear to be automatically trimmed. Using a negative value for strokeWidth works but creates an inner stroke, I'd prefer to have an outer stroke.
Any ideas? Thanks in advance for the help!
Mike
You shouldn't need to create a separate node for the stroke.
Use negative width values to only render the stroke without fill.
Use .foregroundColor to fill.
You should first check to see if an attributed string is already present to ensure you do not clobber it.
Here is the code:
extension SKLabelNode {
func addStroke(color:UIColor, width: CGFloat) {
guard let labelText = self.text else { return }
let font = UIFont(name: self.fontName!, size: self.fontSize)
let attributedString:NSMutableAttributedString
if let labelAttributedText = self.attributedText {
attributedString = NSMutableAttributedString(attributedString: labelAttributedText)
} else {
attributedString = NSMutableAttributedString(string: labelText)
}
let attributes:[NSAttributedStringKey:Any] = [.strokeColor: color, .strokeWidth: -width, .font: font!, .foregroundColor: self.fontColor!]
attributedString.addAttributes(attributes, range: NSMakeRange(0, attributedString.length))
self.attributedText = attributedString
}
}
I am a beginner in Swift and I am trying to get the height of a label.
The label has multiple lines of text. I want to know the total height it occupies on the screen.
Swift 4 with extension
extension UILabel{
public var requiredHeight: CGFloat {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: frame.width, height: CGFloat.greatestFiniteMagnitude))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.font = font
label.text = text
label.attributedText = attributedText
label.sizeToFit()
return label.frame.height
}
}
it's simple, just call
label.bounds.size.height
Updated for Swift 3
func estimatedHeightOfLabel(text: String) -> CGFloat {
let size = CGSize(width: view.frame.width - 16, height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attributes = [NSFontAttributeName: UIFont.systemFont(ofSize: 10)]
let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height
return rectangleHeight
}
override func viewDidLoad() {
super.viewDidLoad()
guard let labelText = label1.text else { return }
let height = estimatedHeightOfLabel(text: labelText)
print(height)
}
Swift 5 ioS 13.2 tested 100%, best solution when the UILabel numberOfLines = 0
Note, result is rounded. Just remove ceil() if you don't want it.
If you want to get height -> give storyboard width of UILabel
If you want to get width -> give storyboard height of UILabel
let stringValue = ""//your label text
let width:CGFloat = 0//storybord width of UILabel
let height:CGFloat = 0//storyboard height of UILabel
let font = UIFont(name: "HelveticaNeue-Bold", size: 18)//font type and size
func getLableHeightRuntime() -> CGFloat {
let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
let boundingBox = stringValue.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)
return ceil(boundingBox.height)
}
func getLabelWidthRuntime() -> CGFloat {
let constraintRect = CGSize(width: .greatestFiniteMagnitude, height: height)
let boundingBox = stringValue.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)
return ceil(boundingBox.width)
}
#iajmeri43's answer Updated for Swift 5
func estimatedLabelHeight(text: String, width: CGFloat, font: UIFont) -> CGFloat {
let size = CGSize(width: width, height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attributes = [NSAttributedString.Key.font: font]
let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height
return rectangleHeight
}
To use it:
// 1. get the text from the label
guard let theLabelsText = myLabel.text else { return }
// 2. get the width of the view the label is in for example a cell
// Here I'm just stating that the cell is the same exact width of whatever the collection's width is which is usually based on the width of the view that collectionView is in
let widthOfCell = self.collectionView.frame.width
// 3. get the font that your using for the label. For this example the label's font is UIFont.systemFont(ofSize: 17)
let theLabelsFont = UIFont.systemFont(ofSize: 17)
// 4. Plug the 3 values from above into the function
let totalLabelHeight = estimatedLabelHeight(text: theLabelsText, width: widthOfCell, font: theLabelsFont)
// 5. Print out the label's height with decimal values eg. 95.46875
print(totalLabelHeight)
// 6. as #slashburn suggested in the comments, use the ceil() function to round out the totalLabelHeight
let ceilHeight = ceil(totalLabelHeight)
// 7. Print out the ceilHeight rounded off eg. 95.0
print(ceilHeight)
Is it possible to set a UILabel's distance between the line, as i had a UILabel contain 3 lines, and linebreakmode is wordwrap?
If you're referring to "leading", which refers to the gap between lines of type - you cannot change this on a UILabel. That is inferred from the front of the label itself. Some people have tried to create categories to override the "leading" property of the UIFont for the label but it doesn't actually work when rendering.
If you really need to control the vertical spacing between lines of text then your best bet is to programmatically drop 1 UILabel per line of fixed width and control the vertical gap yourself.
Here is how you can set line spacing using interface builder and programatically as well.
From Interface Builder:
Programmatically:
SWift 4
Using label extension
extension UILabel {
// Pass value for any one of both parameters and see result
func setLineSpacing(lineSpacing: CGFloat = 0.0, lineHeightMultiple: CGFloat = 0.0) {
guard let labelText = self.text else { return }
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.lineHeightMultiple = lineHeightMultiple
let attributedString:NSMutableAttributedString
if let labelattributedText = self.attributedText {
attributedString = NSMutableAttributedString(attributedString: labelattributedText)
} else {
attributedString = NSMutableAttributedString(string: labelText)
}
// Line spacing attribute
attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))
self.attributedText = attributedString
}
}
Now call extension function
let label = UILabel()
let stringValue = "is\nit\npossible\nto\nset\nthe\nUILabel\ndistance\nbetween\nthe\nline?"
// Pass value for any one argument - lineSpacing or lineHeightMultiple
label.setLineSpacing(lineSpacing: 2.0) . // try values 1.0 to 5.0
// or try lineHeightMultiple
//label.setLineSpacing(lineHeightMultiple = 2.0) // try values 0.5 to 2.0
Or using label instance (Just copy & execute this code to see result)
let label = UILabel()
let stringValue = "is\nit\npossible\nto\nset\nthe\nUILabel\ndistance\nbetween\nthe\nline?"
let attrString = NSMutableAttributedString(string: stringValue)
var style = NSMutableParagraphStyle()
style.lineSpacing = 24 // change line spacing between paragraph like 36 or 48
style.minimumLineHeight = 20 // change line spacing between each line like 30 or 40
// Line spacing attribute
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value: style, range: NSRange(location: 0, length: stringValue.characters.count))
// Character spacing attribute
attrString.addAttribute(NSAttributedStringKey.kern, value: 2, range: NSMakeRange(0, attrString.length))
label.attributedText = attrString