I want to calculate number of lines and height of UILabel dynamically from given text for same.
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问题:
回答1:
Try this
// UILabel *myLabel; CGSize labelSize = [myLabel.text sizeWithFont:myLabel.font constrainedToSize:myLabel.frame.size lineBreakMode:NSLineBreakByWordWrapping]; CGFloat labelHeight = labelSize.height; int lines = [myLabel.text sizeWithFont:myLabel.font constrainedToSize:myLabel.frame.size lineBreakMode:NSLineBreakByWordWrapping].height/16; // '16' is font size or
int lines = labelHeight/16; NSLog(@"lines count : %i \n\n",lines); or
int lines = [myLabel.text sizeWithFont:myLabel.font constrainedToSize:myLabel.frame.size lineBreakMode:UILineBreakModeWordWrap].height /myLabel.font.pointSize; //fetching font size from font By Using Categories, Just Create the category class named as
UILabel+UILabelDynamicHeight.h
UILabel+UILabelDynamicHeight.m
No more tension about the height calculation. Please review the below implementation.
Updates for iOS7 & Above,iOS 7 below : Dynamically calculate the UILabel height
#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame) #define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending) #define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending) #define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending) #define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending) #define iOS7_0 @"7.0" UILabel+UILabelDynamicHeight.h
#import @interface UILabel (UILabelDynamicHeight) #pragma mark - Calculate the size the Multi line Label /*====================================================================*/ /* Calculate the size of the Multi line Label */ /*====================================================================*/ /** * Returns the size of the Label * * @param aLabel To be used to calculte the height * * @return size of the Label */ -(CGSize)sizeOfMultiLineLabel; @end UILabel+UILabelDynamicHeight.m
#import "UILabel+UILabelDynamicHeight.h" @implementation UILabel (UILabelDynamicHeight) #pragma mark - Calculate the size,bounds,frame of the Multi line Label /*====================================================================*/ /* Calculate the size,bounds,frame of the Multi line Label */ /*====================================================================*/ /** * Returns the size of the Label * * @param aLabel To be used to calculte the height * * @return size of the Label */ -(CGSize)sizeOfMultiLineLabel{ //Label text NSString *aLabelTextString = [self text]; //Label font UIFont *aLabelFont = [self font]; //Width of the Label CGFloat aLabelSizeWidth = self.frame.size.width; if (SYSTEM_VERSION_LESS_THAN(iOS7_0)) { //version = 7.0 //Return the calculated size of the Label return [aLabelTextString boundingRectWithSize:CGSizeMake(aLabelSizeWidth, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{ NSFontAttributeName : aLabelFont } context:nil].size; } return [self bounds].size; } @end 回答2:
Calling -sizeToFit on UILabel instance will automatically resize it to fit text it displays, no calculating required. If you need the size, you can get it from label's frame property after that.
label.numberOfLines = 0; // allows label to have as many lines as needed label.text = @"some long text"; [label sizeToFit]; NSLog(@"Label's frame is: %@", NSStringFromCGRect(label.frame)); 回答3:
To summarize, you can calculate the height of a label by using its string and calling boundingRectWithSize. You must provide the font as an attribute, and include .usesLineFragmentOrigin for multi-line labels.
let labelWidth = label.frame.width let maxLabelSize = CGSize(width: labelWidth, height: CGFloat.greatestFiniteMagnitude) let actualLabelSize = label.text!.boundingRect(with: maxLabelSize, options: [.usesLineFragmentOrigin], attributes: [.font: label.font], context: nil) let labelHeight = actualLabelSize.height Some extensions to do just that:
Swift Version:
extension UILabel { func textHeight(withWidth width: CGFloat) -> CGFloat { guard let text = text else { return 0 } return text.height(withWidth: width, font: font) } func attributedTextHeight(withWidth width: CGFloat) -> CGFloat { guard let attributedText = attributedText else { return 0 } return attributedText.height(withWidth: width) } } extension String { func height(withWidth width: CGFloat, font: UIFont) -> CGFloat { let maxSize = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude) let actualSize = self.boundingRect(with: maxSize, options: [.usesLineFragmentOrigin], attributes: [.font : font], context: nil) return actualSize.height } } extension NSAttributedString { func height(withWidth width: CGFloat) -> CGFloat { let maxSize = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude) let actualSize = boundingRect(with: maxSize, options: [.usesLineFragmentOrigin], context: nil) return actualSize.height } } Objective-C Version:
UILabel+Utility.h
#import @interface UILabel (Utility) - (CGFloat)textHeightForWidth:(CGFloat)width; - (CGFloat)attributedTextHeightForWidth:(CGFloat)width; @end UILabel+Utility.m
@implementation NSString (Utility) - (CGFloat)heightForWidth:(CGFloat)width font:(UIFont *)font { CGSize maxSize = CGSizeMake(width, CGFLOAT_MAX); CGSize actualSize = [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : font} context:nil].size; return actualSize.height; } @end @implementation NSAttributedString (Utility) - (CGFloat)heightForWidth:(CGFloat)width { CGSize maxSize = CGSizeMake(width, CGFLOAT_MAX); CGSize actualSize = [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin context:nil].size; return actualSize.height; } @end @implementation UILabel (Utility) - (CGFloat)textHeightForWidth:(CGFloat)width { return [self.text heightForWidth:width font:self.font]; } - (CGFloat)attributedTextHeightForWidth:(CGFloat)width { return [self.attributedText heightForWidth:width]; } @end 回答4:
The current solution has been deprecated as of iOS 7.
Here is an updated solution:
+ (CGFloat)heightOfCellWithIngredientLine:(NSString *)ingredientLine withSuperviewWidth:(CGFloat)superviewWidth { CGFloat labelWidth = superviewWidth - 30.0f; // use the known label width with a maximum height of 100 points CGSize labelContraints = CGSizeMake(labelWidth, 100.0f); NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init]; CGRect labelRect = [ingredientLine boundingRectWithSize:labelContraints options:NSStringDrawingUsesLineFragmentOrigin attributes:nil context:context]; // return the calculated required height of the cell considering the label return labelRect.size.height; } The reason that my solution is set up like this is because I am using a UITableViewCell and resizing the cell dynamically relative to how much room the label will take up.
回答5:
Without calling sizeToFit, you can do this all numerically with a very plug and play solution:
+ (CGFloat)heightForText:(NSString*)text font:(UIFont*)font withinWidth:(CGFloat)width { CGSize size = [text sizeWithAttributes:@{NSFontAttributeName:font}]; CGFloat area = size.height * size.width; CGFloat height = roundf(area / width); return ceilf(height / font.lineHeight) * font.lineHeight; } I use it a lot for UITableViewCells that have dynamically allocated heights.
Solves the attributes problem as well @Salman Zaidi.
回答6:
CGSize maxSize = CGSizeMake(lbl.frame.size.width, CGFLOAT_MAX); CGSize requiredSize = [lbl sizeThatFits:maxSize]; CGFloat height=requiredSize.height 回答7:
Copy & paste this method & used It like:
[lblText setFrame:CGRectMake(lblText.frame.origin.x, lblText.frame.origin.y, width, [self getLabelHeight:lblText])]; - (CGFloat)getLabelHeight:(UILabel*)label { CGSize constraint = CGSizeMake(label.frame.size.width, CGFLOAT_MAX); CGSize size; NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init]; CGSize boundingBox = [label.text boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:label.font} context:context].size; size = CGSizeMake(ceil(boundingBox.width), ceil(boundingBox.height)); return size.height; } 回答8:
In my case, I was using a fixed size header for each section but with a dynamically cell size in each header. The cell's height, depends on the label's height.
Working with:
tableView.estimatedRowHeight = SomeNumber tableView.rowHeight = UITableViewAutomaticDimension Works but when using:
tableView.reloadSections(IndexSet(integer: sender.tag) , with: .automatic) when a lot of headers are not collapsed, creates a lot of bugs such as header duplication (header type x below the same type) and weird animations when the framework reloads with animation, even when using with type .none (FYI, a fixed header height and cell height works).
The solution is making the use of heightForRowAt callback and calculate the height of the label by your self (plus the animation looks a lot better). Remember that the height is being called first.
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat { let object = dataDetailsController.getRowObject(forIndexPath: indexPath) let label = UILabel(frame: tableView.frame) let font = UIFont(name: "HelveticaNeue-Bold", size: 25) label.text = object?.name label.font = font label.numberOfLines = 0 label.textAlignment = .center label.sizeToFit() let size = label.frame.height return Float(size) == 0 ? 34 : size } 回答9:
This is the extension I use for calculating multiline UILabel heights, it's an adjusted snippet from a previous stack overflow post:
extension UILabel { func estimatedHeight(forWidth: CGFloat, text: String, ofSize: CGFloat) -> CGFloat { let size = CGSize(width: forWidth, height: CGFloat(MAXFLOAT)) let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin) let attributes = [NSFontAttributeName: UIFont.systemFont(ofSize: ofSize)] let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height return ceil(rectangleHeight) } } 回答10:
You need to create an extension of String and call this method
func height(withConstrainedWidth width: CGFloat, font: UIFont) -> CGFloat { let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude) let boundingBox = self.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSFontAttributeName: font], context: nil) return ceil(boundingBox.height) } You must send the width of your label
回答11:
Swift 4 To get height for the NSAttributedString use this function below. Where width - the width of your UILabel or UITextView
func getHeight(for attributedString: NSAttributedString, font: UIFont, width: CGFloat) -> CGFloat { let textStorage = NSTextStorage(attributedString: attributedString) let textContainter = NSTextContainer(size: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)) let layoutManager = NSLayoutManager() layoutManager.addTextContainer(textContainter) textStorage.addLayoutManager(layoutManager) textStorage.addAttribute(NSAttributedStringKey.font, value: font, range: NSMakeRange(0, textStorage.length)) textContainter.lineFragmentPadding = 0.0 layoutManager.glyphRange(for: textContainter) return layoutManager.usedRect(for: textContainter).size.height } To get height for String use this function, It is almost identical like the previous method:
func getHeight(for string: String, font: UIFont, width: CGFloat) -> CGFloat { let textStorage = NSTextStorage(string: string) let textContainter = NSTextContainer(size: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)) let layoutManager = NSLayoutManager() layoutManager.addTextContainer(textContainter) textStorage.addLayoutManager(layoutManager) textStorage.addAttribute(NSAttributedStringKey.font, value: font, range: NSMakeRange(0, textStorage.length)) textContainter.lineFragmentPadding = 0.0 layoutManager.glyphRange(for: textContainter) return layoutManager.usedRect(for: textContainter).size.height } 回答12:
if you want the label to take dynamic lines you may use this
label.numberOfLines = 0; // allows label to have as many lines as needed label.text = @"some long text "; [label sizeToFit]; NSLog(@"Label's frame is: %@", NSStringFromCGRect(label.frame));