Here is my code, I put one ASTextNode on my super view and applied some attributes, but some of them do not work, such as ASTextBorder.
CGFloat top = 10;
CGFloat bottom = -1;
UIEdgeInsets insets = UIEdgeInsetsMake(top, -10, bottom, -10);
CGFloat radius = font.pointSize / 2;
mps.alignment = textAlignment; //NSMutableParagraphStyle
ASTextNode *textNode = [ASTextNode new];
ASTextBorder *asBorder = [ASTextBorder borderWithFillColor:UIColor.redColor cornerRadius:radius];
asBorder.insets = insets;
NSDictionary *attributes = #{
NSForegroundColorAttributeName: UIColor.whiteColor,
NSFontAttributeName: font,
NSStrokeWidthAttributeName: #(-5),
NSStrokeColorAttributeName: UIColor.blackColor,
NSParagraphStyleAttributeName: mps,
ASTextBorderAttributeName: asBorder,
};
textNode.attributedText = [[NSAttributedString alloc] initWithString:text attributes:attributes];
textNode.textContainerInset = UIEdgeInsetsMake(0, 10, 5, 10);
return textNode;
The rest of the attributes specified in the dictionary perform normal.
Can anyone explain why? Thanks.
It turns out the custom attributes are available in ASTextNode2 and controlled by switch.
Related
I'm going to make an shadow path for UILabel, which outlines the text of it. Is the UILabel text somehow convertable to CGPath?
I’d suggest that the easiest approach is set the shadow properties of the layer.
In Objective-C:
self.label.layer.shadowColor = UIColor.blackColor.CGColor;
self.label.layer.shadowRadius = 10;
self.label.layer.shadowOpacity = 1;
self.label.layer.shadowOffset = CGSizeZero;
In Swift:
label.layer.shadowColor = UIColor.black.cgColor
label.layer.shadowRadius = 10
label.layer.shadowOpacity = 1
label.layer.shadowOffset = .zero
Yielding:
You said:
But, in layers I have some additional content, where I don't want to add the shadow.
If you have subviews or sublayers that are interfering with the shadow, I’d suggest you move that content out of the label and into their own view hierarchy. It’s hard to be specific without knowing what sublayers/subviews you’ve added to your label.
You said:
... I need opacity of the shadow too and it's impossible without layers.
That’s not entirely true. You can use the NSAttributedString pattern and specify the alpha as part of the shadowColor.
E.g. in Objective-C:
NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowOffset = CGSizeZero;
shadow.shadowBlurRadius = 20;
shadow.shadowColor = [UIColor.blackColor colorWithAlphaComponent:1];
NSDictionary<NSAttributedStringKey, id> *attributes = #{ NSShadowAttributeName: shadow };
NSMutableAttributedString *string = [self.label.attributedText mutableCopy];
[string setAttributes:attributes range:NSMakeRange(0, string.length)];
self.label.attributedText = string;
Or in Swift:
let shadow = NSShadow()
shadow.shadowOffset = .zero
shadow.shadowBlurRadius = 20
shadow.shadowColor = UIColor.black.withAlphaComponent(1)
let attributes: [NSAttributedString.Key: Any] = [.shadow: shadow]
guard let string = label.attributedText?.mutableCopy() as? NSMutableAttributedString else { return }
string.setAttributes(attributes, range: NSRange(location: 0, length: string.length))
label.attributedText = string
I am drawing label using drawRect and the code looks like something below.
if (productName && productName.length > 0) {
UILabel *productNameLabel = [[UILabel alloc]init];
productNameLabel.numberOfLines = 2;
productNameLabel.attributedText = [self shadowedTextWithString:productName fontName:#"ProximaNovaA-Light" fontSize:productNameLabelFontSize isOfferType:NO];
[productNameLabel sizeToFit];
//drawing the UILabel
[productNameLabel drawTextInRect:CGRectMake(25, labelYPosition, productNameLabel.frame.size.width, productNameLabel.frame.size.height)];
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 25, labelYPosition);
[productNameLabel.layer renderInContext:UIGraphicsGetCurrentContext()];
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), -25, -labelYPosition);
labelYPosition += productNameLabel.frame.origin.y + productNameLabel.frame.size.height+20;
}
However, the productNameLabel.numberOfLiness = 2 doesn't seem to work at all... If the string has length that exceeds the width of the screen, the text is truncated and the UILabel stays one liner.
Anyone knows how do i do it, so that if the length of the string exceeds the width of screen, the exceeded words will go to the second line?
Thanks!
updated code, still doesn't work !
if (productName && productName.length > 0) {
UILabel *productNameLabel = [[UILabel alloc]init];
productNameLabel.lineBreakMode = YES;
productNameLabel.numberOfLines = 0;
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.lineBreakMode = NSLineBreakByTruncatingTail;
NSMutableAttributedString *productNameAttributedString = [self shadowedTextWithString:productName fontName:#"ProximaNovaA-Light" fontSize:productNameLabelFontSize isOfferType:NO];
[productNameAttributedString addAttribute:NSParagraphStyleAttributeName
value:style
range:NSMakeRange(0, productNameAttributedString.length)];
productNameLabel.attributedText = productNameAttributedString;
CGSize constrainedSize = CGSizeMake(paramImageView.image.size.width -50 , 9999);
CGRect requiredHeight = [productNameLabel.attributedText boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];
if (requiredHeight.size.width > productNameLabel.frame.size.width) {
requiredHeight = CGRectMake(25,labelYPosition, productNameLabel.frame.size.width, requiredHeight.size.height);
}
CGRect newFrame = productNameLabel.frame;
newFrame.size.height = requiredHeight.size.height;
productNameLabel.frame = newFrame;
productNameLabel.backgroundColor = [UIColor redColor];
[productNameLabel drawTextInRect:CGRectMake(25, labelYPosition, paramImageView.image.size.width-50, requiredHeight.size.height)];
//[productNameLabel drawTextInRect:CGRectMake(25, labelYPosition, 30, productNameLabel.frame.size.height)];
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 25, labelYPosition);
[productNameLabel.layer renderInContext:UIGraphicsGetCurrentContext()];
CGContextTranslateCTM(UIGraphicsGetCurrentContext(), -25, -labelYPosition);
labelYPosition += productNameLabel.frame.origin.y + productNameLabel.frame.size.height+20;
}
Objective-c
CGSize sizeToFit = [title sizeWithFont:productNameLabel.font constrainedToSize:productNameLabel.frame.size lineBreakMode:productNameLabel.lineBreakMode];
Swift 2.2
var sizeToFit = title.sizeWithFont(productNameLabel.font, constrainedToSize: productNameLabel.frame.size, lineBreakMode: productNameLabel.lineBreakMode)
Swift3.0
var sizeToFit: CGSize = title.size(with: productNameLabel.font, constrainedTo: productNameLabel.frame.size, lineBreakMode: productNameLabel.lineBreakMode)
CGSize constrainedSize = CGSizeMake(self.resizableLable.frame.size.width , 9999);
NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
[UIFont fontWithName:#"HelveticaNeue" size:11.0], NSFontAttributeName,
nil];
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:#"textToShow" attributes:attributesDictionary];
CGRect requiredHeight = [string boundingRectWithSize:constrainedSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];
if (requiredHeight.size.width > self.resizableLable.frame.size.width) {
requiredHeight = CGRectMake(0,0, self.resizableLable.frame.size.width, requiredHeight.size.height);
}
CGRect newFrame = self.resizableLable.frame;
newFrame.size.height = requiredHeight.size.height;
self.resizableLable.frame = newFrame;
Implement this method to find width of string pass font as an argument you want to give to string and this method will return width of string.
func widthOfString(usingFont font: UIFont) -> CGFloat {
let fontAttributes = [NSFontAttributeName: font]
let size = self.size(attributes: fontAttributes)
return size.width
}
Set this width as a width of the UILabel
Swift-3:
Returns the height of label with padding depending on the text.
func heightForView(text: String, font: UIFont, width: CGFloat) -> CGFloat {
let label = UILabel(frame: CGRect.init(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.font = font
label.text = text
label.sizeToFit()
return label.frame.height + labelHeightPadding ///extra padding; if needed be.
}
Edit: The linked "duplicate" question only deals with calculating text rectangle. I need to calculate actual font size after label scaled it, NOT the string size.
This method is now deprecated:
size = [self sizeWithFont:font // 20
minFontSize:minFontSize // 14
actualFontSize:&actualFontSize // 16
forWidth:maxWidth
lineBreakMode:self.lineBreakMode];
How can I calculate font size of a UILabel now in iOS 7 when it shrunk the size of the text to fit in?
I have the same problem, I need to know the actual size to make that the others UILabels in my UIView match.
I know that it's not a perfect solution, but perhaps it's useful for you.
My solution is: instead of use adjustsFontSizeToFitWidth I calculate "manually" the size.
CGSize initialSize = [_label.text sizeWithAttributes:#{NSFontAttributeName:_label.font}];
while ( initialSize.width > _label.frame.size.width ) {
[_label setFont:[_label.font fontWithSize:_label.font.pointSize - 1]];
initialSize = [_label.text sizeWithAttributes:#{NSFontAttributeName:_label.font}];
}
CGFloat actualSize = _label.font.pointSize;
Distilled from Julius Bahr's answer on this page, this method works perfectly for getting the actual font size after it has been automatically adjusted:
- (CGFloat)getActualFontSizeForLabel:(UILabel *)label
{
NSStringDrawingContext *labelContext = [NSStringDrawingContext new];
labelContext.minimumScaleFactor = label.minimumScaleFactor;
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:label.text attributes:#{ NSFontAttributeName: label.font }];
[attributedString boundingRectWithSize:label.frame.size
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
context:labelContext];
CGFloat actualFontSize = label.font.pointSize * labelContext.actualScaleFactor;
return actualFontSize;
}
I am using this in my application to get the font sizes for three different labels for which I need to keep the sizes in synch while still allowing them to auto-shrink for localized translations that can be quite a bit longer than their original English counterparts.
I call that method once for each label, and then if they are not all the same value, I set the label's font sizes to the minimum of the three.
The use of minFontSize was deprecated on UILabel in iOS 6, and on the NSString drawing additions in iOS 7. If you want to use it and find the actual font size used, you need to use the deprecated method you mentioned in your question.
The replacement for minFontSize is minimumScaleFactor. If you want to find the actual scale factor used, you need to create an NSStringDrawingContext and pass it in the boundingRectWithSize:options:attributes:context: message, like this:
NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
context.minimumScaleFactor = 0.7;
[label.text boundingRectWithSize:CGSizeMake(maxWidth, HUGE_VAL)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{
NSFontAttributeName: font
} context:context];
CGFloat actualFontSize = font.pointSize * context.actualScaleFactor;
Expanding on Ferran's answer
To expand to fill width or height, whichever it hits first
Swift version
func getFontSizeToFitFrameOfLabel(label: UILabel) -> CGFloat
{
var initialSize : CGSize = label.text!.sizeWithAttributes([NSFontAttributeName : label.font])
if initialSize.width > label.frame.size.width ||
initialSize.height > label.frame.size.height
{
while initialSize.width > label.frame.size.width ||
initialSize.height > label.frame.size.height
{
label.font = label.font.fontWithSize(label.font.pointSize - 1)
initialSize = label.text!.sizeWithAttributes([NSFontAttributeName : label.font])
}
} else {
while initialSize.width < label.frame.size.width &&
initialSize.height < label.frame.size.height
{
label.font = label.font.fontWithSize(label.font.pointSize + 1)
initialSize = label.text!.sizeWithAttributes([NSFontAttributeName : label.font])
}
// went 1 point too large so compensate here
label.font = label.font.fontWithSize(label.font.pointSize - 1)
}
return label.font.pointSize;
}
Then do something like this to use it (say your label is named title1Label)
title1Label.frame = CGRect(x: 0.0, y: 0.0, width: view.frame.size.width, height: view.frame.size.height)
// sets font to some nonzero size to begin with, it will change up or down to fit the label's frame
title1Label.font = UIFont(name: "Super Mario 256", size: 45.0)
title1Label.font = title1Label.font.fontWithSize(getFontSizeToFitFrameOfLabel(title1Label))
// resize height to be a little larger than the font height
title1Label.frame.size.height = title1Label.font.pointSize*1.3
Objective C version:
- (CGFloat) maxFontSize:(UILabel *)label{
CGSize initialSize = [label.text sizeWithAttributes:#{NSFontAttributeName:label.font}];
if (initialSize.width > label.frame.size.width ||
initialSize.height > label.frame.size.height)
{
while (initialSize.width > label.frame.size.width ||
initialSize.height > label.frame.size.height)
{
[label setFont:[label.font fontWithSize:label.font.pointSize - 1]];
initialSize = [label.text sizeWithAttributes:#{NSFontAttributeName:label.font}];
}
} else {
while (initialSize.width < label.frame.size.width &&
initialSize.height < label.frame.size.height)
{
[label setFont:[label.font fontWithSize:label.font.pointSize + 1]];
initialSize = [label.text sizeWithAttributes:#{NSFontAttributeName:label.font}];
}
// went 1 point too large so compensate here
[label setFont:[label.font fontWithSize:label.font.pointSize - 1]];
}
return label.font.pointSize;
}
My specific quest has been to size the font on 2 labels equally with adjustsFontSizeToFitWidth enabled.
The solution works on iOS 6 and 7.
+ (void)sizeLabelFontToMinSizeFor:(UILabel *)label1 and:(UILabel *)label2 {
NSStringDrawingContext *labelContext = [NSStringDrawingContext new];
labelContext.minimumScaleFactor = label1.minimumScaleFactor;
NSAttributedString *attributedString1 = [[NSAttributedString alloc] initWithString:label1.text attributes:#{NSFontAttributeName : label1.font}];
// the NSStringDrawingUsesLineFragmentOrigin and NSStringDrawingUsesFontLeading options are magic
[attributedString1 boundingRectWithSize:label1.frame.size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:labelContext];
CGFloat actualFontSize1 = label1.font.pointSize * labelContext.actualScaleFactor;
labelContext = [NSStringDrawingContext new];
labelContext.minimumScaleFactor = label2.minimumScaleFactor;
NSAttributedString *attributedString2 = [[NSAttributedString alloc] initWithString:label2.text attributes:#{NSFontAttributeName : label2.font}];
[attributedString2 boundingRectWithSize:label2.frame.size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:labelContext];
CGFloat actualFontSize2 = label2.font.pointSize * labelContext.actualScaleFactor;
CGFloat minSize = MIN(actualFontSize1, actualFontSize2);
label1.font = [UIFont fontWithName:RCDefaultFontName size:minSize];
label2.font = [UIFont fontWithName:RCDefaultFontName size:minSize];
}
Next code doesn't support minFontSize and lineBreakMode so if you need them you should improve it by yourself:
CGSize NSString_sizeWithFont(NSString * str, UIFont *font) {
CGSize result;
if (NO == [str respondsToSelector: #selector(sizeWithAttributes:)]) {
// legacy way
result = [str sizeWithFont: font];
} else {
// modern way
NSDictionary * dict = [NSDictionary dictionaryWithObjectsAndKeys:
font, NSFontAttributeName, nil];
result = [str sizeWithAttributes: dict];
}
return result;
}
UIFont * NSString_calcActualFont(NSString * str, UIFont * initialFont,
CGSize sizeLimit, CGSize * actualSize)
{
const CGSize curSize = NSString_sizeWithFont(str, initialFont);
CGFloat actualFontSize = initialFont.pointSize;
actualFontSize *= MIN(sizeLimit.width / curSize.width, sizeLimit.height / curSize.height);
UIFont * actualFont = [initialFont fontWithSize: floorf(actualFontSize)];
*actualSize = NSString_sizeWithFont(str, actualFont);
return actualFont;
}
Simple solution for one-line UILabel:
//myLabel - initial label
UILabel *fullSizeLabel = [UILabel new];
fullSizeLabel.font = myLabel.font;
fullSizeLabel.text = myLabel.text;
[fullSizeLabel sizeToFit];
CGFloat actualFontSize = myLabel.font.pointSize * (myLabel.bounds.size.width / fullSizeLabel.bounds.size.width);
//correct, if new font size bigger than initial
actualFontSize = actualFontSize < myLabel.font.pointSize ? actualFontSize : myLabel.font.pointSize;
Erik van der Neut's code worked for me, so I translated it in Swift and wrapped it in a UILabel extension:
extension UILabel {
public func actualFontSize()-> CGFloat {
let context = NSStringDrawingContext()
context.minimumScaleFactor = self.minimumScaleFactor
let attributedString = NSAttributedString(string: self.text ?? "", attributes: [NSFontAttributeName: self.font])
attributedString.boundingRectWithSize(self.frame.size, options: [.UsesLineFragmentOrigin], context: context)
return (self.font.pointSize * context.actualScaleFactor)
}
}
NSMutableArray *items // contains 15 items
I need to put one down label from another i try something like this but not work
int count=20;
for(int i = 0; i < [items count]; i++){
UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0,0,0,count)];
label.text = #"text"; //etc...
count+=20;
[_scroll addSubview:label];
}
What can i do thanks
You need to set the frame properly.
int count=20;
for(int i = 0; i < [items count]; i++){
UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0,count,0,0)];
label.text = #"text"; //etc...
[label sizeToFit]; // resize the width and height to fit the text
count+=20;
[_scroll addSubview:label];
}
As suggested by rmaddy...adding a new line to adjust the height of the label as well, assumed that you have an NSMutableArray object 'items' containing strings.
float previousLabelHeight = 0.0;
for(int i = 0; i < [items count]; i++){
CGSize theSize = [[items objectAtIndex: i] sizeWithFont:[UIFont systemFontOfSize:17.0] constrainedToSize:CGSizeMake(320, FLT_MAX) lineBreakMode:UILineBreakModeWordWrap]; //can adjust width from 320 to whatever you want and system font as well
float newLabelHeight = previousLabelHeight + theSize.height;
UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(0,newLabelHeight,0,0)];
label.text = [items objectAtIndex: i];
[label sizeToFit]; // resize the width and height to fit the text
previousLabelHeight = newLabelHeight + 5 //adding 5 for padding
[_scroll addSubview:label];
}
Cheers,
Happy Coding.
I think you're trying to change the frame's Y value, but the last parameter of CGRectMake() is the rect's height. You want the second parameter.
Here is the Swift version to add labels dynamically from array..
var previousLabelHeight: CGFloat = 0.0;
for dict in items {
let text: String = "Some text to display in the UILabel"
let size = heightNeededForText(text as NSString, withFont: UIFont.systemFontOfSize(15.0), width: scrollView.frame.size.width - 20, lineBreakMode: NSLineBreakMode.ByWordWrapping)
let newLabelHeight = previousLabelHeight + size;
let label = UILabel(frame: CGRectMake(0, newLabelHeight, 0, 0))
label.text = text
label.sizeToFit() // resize the width and height to fit the text
previousLabelHeight = newLabelHeight + 5 //adding 5 for padding
scroll.addSubview(label)
}
As sizeWithFont: ConstraintedToSize is deprecated from ios 7.0,
we have to use boundingRectWithSize method from NSString....
func heightNeededForText(text: NSString, withFont font: UIFont, width: CGFloat, lineBreakMode:NSLineBreakMode) -> CGFloat {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineBreakMode = lineBreakMode
let size: CGSize = text.boundingRectWithSize(CGSizeMake(width, CGFloat.max), options: [.UsesLineFragmentOrigin, .UsesFontLeading], attributes: [ NSFontAttributeName: font, NSParagraphStyleAttributeName: paragraphStyle], context: nil).size//text boundingRectWithSize:CGSizeMake(width, CGFLOAT_MA
return ceil(size.height);
}
I want to display an image next to a UILabel, however UILabel has variable text length, so I don't know where to place the image. How can I accomplish this?
CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font
constrainedToSize:maximumLabelSize
lineBreakMode:yourLabel.lineBreakMode];
What is -[NSString sizeWithFont:forWidth:lineBreakMode:] good for?
this question might have your answer, it worked for me.
For 2014, I edited in this new version, based on the ultra-handy comment by Norbert below! This does everything.
// yourLabel is your UILabel.
float widthIs =
[self.yourLabel.text
boundingRectWithSize:self.yourLabel.frame.size
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{ NSFontAttributeName:self.yourLabel.font }
context:nil]
.size.width;
NSLog(#"the width of yourLabel is %f", widthIs);
yourLabel.intrinsicContentSize.width for Objective-C / Swift
In swift
yourLabel.intrinsicContentSize().width
The selected answer is correct for iOS 6 and below.
In iOS 7, sizeWithFont:constrainedToSize:lineBreakMode: has been deprecated. It is now recommended you use boundingRectWithSize:options:attributes:context:.
CGRect expectedLabelSize = [yourString boundingRectWithSize:sizeOfRect
options:<NSStringDrawingOptions>
attributes:#{
NSFontAttributeName: yourString.font
AnyOtherAttributes: valuesForAttributes
}
context:(NSStringDrawingContext *)];
Note that the return value is a CGRect not a CGSize. Hopefully that'll be of some assistance to people using it in iOS 7.
Swift 4 Answer who are using Constraint
label.text = "Hello World"
var rect: CGRect = label.frame //get frame of label
rect.size = (label.text?.size(attributes: [NSFontAttributeName: UIFont(name: label.font.fontName , size: label.font.pointSize)!]))! //Calculate as per label font
labelWidth.constant = rect.width // set width to Constraint outlet
Swift 5 Answer who are using Constraint
label.text = "Hello World"
var rect: CGRect = label.frame //get frame of label
rect.size = (label.text?.size(withAttributes: [NSAttributedString.Key.font: UIFont(name: label.font.fontName , size: label.font.pointSize)!]))! //Calculate as per label font
labelWidth.constant = rect.width // set width to Constraint outlet
In iOS8 sizeWithFont has been deprecated, please refer to
CGSize yourLabelSize = [yourLabel.text sizeWithAttributes:#{NSFontAttributeName : [UIFont fontWithName:yourLabel.font size:yourLabel.fontSize]}];
You can add all the attributes you want in sizeWithAttributes.
Other attributes you can set:
- NSForegroundColorAttributeName
- NSParagraphStyleAttributeName
- NSBackgroundColorAttributeName
- NSShadowAttributeName
and so on. But probably you won't need the others
CGRect rect = label.frame;
rect.size = [label.text sizeWithAttributes:#{NSFontAttributeName : [UIFont fontWithName:label.font.fontName size:label.font.pointSize]}];
label.frame = rect;
Here's something I came up with after applying a few principles other SO posts, including Aaron's link:
AnnotationPin *myAnnotation = (AnnotationPin *)annotation;
self = [super initWithAnnotation:myAnnotation reuseIdentifier:reuseIdentifier];
self.backgroundColor = [UIColor greenColor];
self.frame = CGRectMake(0,0,30,30);
imageView = [[UIImageView alloc] initWithImage:myAnnotation.THEIMAGE];
imageView.frame = CGRectMake(3,3,20,20);
imageView.layer.masksToBounds = NO;
[self addSubview:imageView];
[imageView release];
CGSize titleSize = [myAnnotation.THETEXT sizeWithFont:[UIFont systemFontOfSize:12]];
CGRect newFrame = self.frame;
newFrame.size.height = titleSize.height + 12;
newFrame.size.width = titleSize.width + 32;
self.frame = newFrame;
self.layer.borderColor = [UIColor colorWithRed:0 green:.3 blue:0 alpha:1.0f].CGColor;
self.layer.borderWidth = 3.0;
UILabel *infoLabel = [[UILabel alloc] initWithFrame:CGRectMake(26,5,newFrame.size.width-32,newFrame.size.height-12)];
infoLabel.text = myAnnotation.title;
infoLabel.backgroundColor = [UIColor clearColor];
infoLabel.textColor = [UIColor blackColor];
infoLabel.textAlignment = UITextAlignmentCenter;
infoLabel.font = [UIFont systemFontOfSize:12];
[self addSubview:infoLabel];
[infoLabel release];
In this example, I'm adding a custom pin to a MKAnnotation class that resizes a UILabel according to the text size. It also adds an image on the left side of the view, so you see some of the code managing the proper spacing to handle the image and padding.
The key is to use CGSize titleSize = [myAnnotation.THETEXT sizeWithFont:[UIFont systemFontOfSize:12]]; and then redefine the view's dimensions. You can apply this logic to any view.
Although Aaron's answer works for some, it didn't work for me. This is a far more detailed explanation that you should try immediately before going anywhere else if you want a more dynamic view with an image and resizable UILabel. I already did all the work for you!!