So I'm trying to fix some outstanding, pre-IOS7 deprecations involving sizeWithFont. I've been following the answers provided here 'sizeWithFont:constrainedToSize:lineBreakMode:'is deprecated:
..which mostly have to deal with CGSize and CGSizeMake. But my problem has to do with CGRectMake and I haven't quite been able to put it together the way that I want.
Here's the original code:
CGSize optimumSize = [percentageText sizeWithFont:self.percentageFont constrainedToSize:CGSizeMake(max_text_width,100)];
CGRect percFrame = CGRectMake(text_x, right_label_y, optimumSize.width, optimumSize.height);
And here's what I've tried to do:
NSString *percentageText = [NSString stringWithFormat:#"%.1f%%", component.value/total*100];
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:percentageText
attributes:#
{
NSFontAttributeName: self.percentageFont
}];
CGRect percFrame = [attributedText boundingRectWithSize:(CGRectMake(text_x, right_label_y, max_text_width,100))
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
CGSize optimumSize = percFrame.size;
But I get the error: "Sending CGRect to parameter of incompatible type CGSize". However I need all four attributes... not just the width and height. So I have to use CGRect and not CGSize. Any idea how I can make it work?
Otherwise all of my other code that just uses CGSize works just fine. It's just I have two pieces of code that really need CGRect.
The method on NSAttributedString takes a maximum size as argument. You can set the origin you want on the CGRect it returns.
NSString *percentageText = [NSString stringWithFormat:#"%.1f%%", component.value/total*100];
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:percentageText
attributes:#
{
NSFontAttributeName: self.percentageFont
}];
CGRect percFrame = [attributedText boundingRectWithSize:(CGSizeMake(max_text_width,100))
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
percFrame.origin = CGPointMake(text_x, right_label_y)
Related
In iOS7, sizeWithFont is deprecated, so I am using boundingRectWithSize(which returns a CGRect value). My code:
UIFont *fontText = [UIFont fontWithName:[AppHandlers zHandler].fontName size:16];
// you can use your font.
CGSize maximumLabelSize = CGSizeMake(310, 9999);
CGRect textRect = [myString boundingRectWithSize:maximumLabelSize
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{NSFontAttributeName:fontText}
context:nil];
expectedLabelSize = CGSizeMake(textRect.size.width, textRect.size.height);
In textRect, I'm getting a size greater than my maximumLabelSize, a different size than when using sizeWithFont. How can I resolve this issue?
How about create new label and using sizeThatFit:(CGSize)size ??
UILabel *gettingSizeLabel = [[UILabel alloc] init];
gettingSizeLabel.font = [UIFont fontWithName:#"YOUR FONT's NAME" size:16];
gettingSizeLabel.text = #"YOUR LABEL's TEXT";
gettingSizeLabel.numberOfLines = 0;
gettingSizeLabel.lineBreakMode = NSLineBreakByWordWrapping;
CGSize maximumLabelSize = CGSizeMake(310, CGFLOAT_MAX);
CGSize expectSize = [gettingSizeLabel sizeThatFits:maximumLabelSize];
Edit: This upper code is not good for ios 7 and above, so please use below:
CGRect textRect = [myString boundingRectWithSize:maximumLabelSize
options:NSStringDrawingUsesLineFragmentOrigin| NSStringDrawingUsesFontLeading
attributes:#{NSFontAttributeName:fontText}
context:nil];
Maybe you need to provide additional option to the method that is suggested in this answer:
CGSize maximumLabelSize = CGSizeMake(310, CGFLOAT_MAX);
CGRect textRect = [myString boundingRectWithSize:maximumLabelSize
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:#{NSFontAttributeName: fontText}
context:nil];
Here is my working code snippet:
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithDictionary:attributeDict];
NSString *headline = [dict objectForKey:#"title"];
UIFont *font = [UIFont boldSystemFontOfSize:18];
CGRect rect = [headline boundingRectWithSize:CGSizeMake(300, 1000) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:#{NSFontAttributeName:font} context:nil];
CGFloat height = roundf(rect.size.height +4)
I added 4px to the calculated height, because without these 4px, there is one line missing.
I use this code snippet in a tableView and add the "height" to an array of NSNumbers and I get the correct cell height for the default textLabel.
Add 4 more pixel if you want more space under the text in the textLabel.
**** UPDATE ****
I do not agree with the "width bug of 40px", I shout be the 4px of missing height, because 4px is the default height of a space between a letter and the bound of a single line.
You can check it with a UILabel, for a fontsize of 16 you need a UILabel height of 20.
But if your last line has no "g" or whatever in it, the measuring could be miss the 4px of height.
I rechecked it with a little method, I get an accurate height of 20,40 or 60
for my label and a right width less than 300px.
To support iOS6 and iOS7, you can use my method:
- (CGFloat)heightFromString:(NSString*)text withFont:(UIFont*)font constraintToWidth:(CGFloat)width
{
CGRect rect;
float iosVersion = [[[UIDevice currentDevice] systemVersion] floatValue];
if (iosVersion >= 7.0) {
rect = [text boundingRectWithSize:CGSizeMake(width, 1000) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:#{NSFontAttributeName:font} context:nil];
}
else {
CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(width, 1000) lineBreakMode:NSLineBreakByWordWrapping];
rect = CGRectMake(0, 0, size.width, size.height);
}
NSLog(#"%#: W: %.f, H: %.f", self, rect.size.width, rect.size.height);
return rect.size.height;
}
**** UPGRADE ****
Thanks to your comments, I upgraded my function as followed. Since sizeWithFont is deprecated and you will get a warning in XCode, I added the diagnostic-pragma-code to remove the warning for this particular function-call/block of code.
- (CGFloat)heightFromStringWithFont:(UIFont*)font constraintToWidth:(CGFloat)width
{
CGRect rect;
if ([self respondsToSelector:#selector(boundingRectWithSize:options:attributes:context:)]) {
rect = [self boundingRectWithSize:CGSizeMake(width, 1000) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:#{NSFontAttributeName:font} context:nil];
}
else {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
CGSize size = [self sizeWithFont:font constrainedToSize:CGSizeMake(width, 1000) lineBreakMode:NSLineBreakByWordWrapping];
rect = CGRectMake(0, 0, size.width, size.height);
#pragma GCC diagnostic pop
}
return ceil(rect.size.height);
}
In addition to the 4px topic:
depending which font and font-weight you use, the calculation returns different height-values. In my case: HelveticaNeue-Medium with a fontsize of 16.0 returns a line-height of 20.0 for a single line but 39.0 for two lines, 78px for 4 lines --> 1px missing for every line - beginning with line 2 - but you want to have your fontsize + 4px linespace for every line you have to get a height-result.
Please keep that in mind while coding!
I don´t have a function yet for this "problem" but I will update this post when I´m finished.
If I understand correctly, you are using boundingRectWithSize: just as a way of getting the size you would get with sizeWithFont (meaning you want directly the CGSize, not the CGRect)?
This looks like what you are looking for :
Replacement for deprecated sizeWithFont: in iOS 7?
They are using sizeWithAttributes: to get the size, as a replacement for sizeWithFont.
Do you still get the wrong size using something like this :
UIFont *fontText = [UIFont fontWithName:[AppHandlers zHandler].fontName size:16];
// you can use your font.
expectedLabelSize = [myString sizeWithAttributes:#{NSFontAttributeName:fontText}];
The #SoftDesigner's comment has worked for me
CGRect descriptionRect = [description boundingRectWithSize:CGSizeMake(width, 0)
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:#{NSFontAttributeName : [UIFont systemFontOfSize:12]}
context:nil];
result = ceil(descriptionRect.size.height);
for finding size of label run time sizewithfont is deprecated for iOS 7.0 instead of that you have to use -boundingRectWithSize:options:attributes:context: method
you can use it like below code
CGSize constraint = CGSizeMake(MAXIMUM_WIDHT, TEMP_HEIGHT);
NSRange range = NSMakeRange(0, [[self.message body] length]);
NSDictionary *attributes = [YOUR_LABEL.attributedText attributesAtIndex:0 effectiveRange:&range];
CGSize boundingBox = [myString boundingRectWithSize:constraint options:NSStringDrawingUsesFontLeading attributes:attributes context:nil].size;
int numberOfLine = ceil((boundingBox.width) / YOUR_LABEL.frame.size.width);
CGSize descSize = CGSizeMake(ceil(boundingBox.width), ceil(self.lblMessageDetail.frame.size.height*numberOfLine));
CGRect frame=YOUR_LABEL.frame;
frame.size.height=descSize.height;
YOUR_LABEL.frame=frame;
here you have to give width to maximum length for finding height or width.
try this it is working for me.
I have a method that gives me the perfect size for a UITextView given a length of string (with the corresponding correct font size) :
- (NSInteger) heightOfLabel:(NSString*) string {
CGSize maximumLabelSize = CGSizeMake([[UIScreen mainScreen] bounds].size.width - 40, FLT_MAX);
CGSize expectedLabelSize = [[NSString stringTrimmedForLeadingAndTrailingWhiteSpacesFromString:string]
sizeWithFont:[UIFont systemFontOfSize:15]
constrainedToSize:maximumLabelSize
lineBreakMode:NSLineBreakByWordWrapping];
return expectedLabelSize.height + 5;
}
In fact, it still gives me a perfect fit, even in iOS7. Although now it comes up with a warning method that says I shouldn't use 'sizeWithFont:contrainedToSize:lineBreakMode'.
It now says I should be using -boundingRectWithSize:options:attributes:context:
This method isn't new to iOS7 and therefore i figure that it is okay to ask it on stack overflow, rather than going across to the official apple developers forum.
I have three questions:
1) Because it is deprecated, does that mean I should definitely replace it, despite it still working?
2) I have tried many different boundingRectWithSize: methods, with various variables but it is never perfect, it always seems to be slightly out (as many stackoverflow questions point out) - is there a perfect replacement with this none-deprecated method that does exactly the same as my previous method with as minimal hassle?
3) why remove this method? Is it because of the overlap with this other method?
After an hour of trial error I managed to make it work:
CGSize maximumLabelSize = CGSizeMake(tableView.width, MAXFLOAT);
NSStringDrawingOptions options = NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesLineFragmentOrigin;
NSDictionary *attr = #{NSFontAttributeName: [UIFont systemFontOfSize:15]};
CGRect labelBounds = [string boundingRectWithSize:maximumLabelSize
options:options
attributes:attr
context:nil];
Update:
As Mr. T mentions in answer below : In iOS 7 and later, this method returns fractional sizes (in the size component of the returned CGRect); to use a returned size to size views, you must use raise its value to the nearest higher integer using the ceil function. ceilf function is recommended to use.
CGFloat height = ceilf(labelBounds.size.height);
I believe the function was deprecated because that series of NSString+UIKit functions were based on the UIStringDrawing library, which wasn't thread safe. If you tried to run them not on the main thread (like any other UIKit functionality), you'll get unpredictable behaviors. In particular, if you ran the function on multiple threads simultaneously, it'll probably crash your app. This is why in iOS 6, they introduced a the boundingRectWithSize:... method for NSAttributedStrings. This was built on top of the NSStringDrawing libraries and is thread safe.
If you look at the new NSString boundingRectWithSize:... function, it asks for an attributes array in the same manner as a NSAttributeString. If I had to guess, this new NSString function in iOS 7 is merely a wrapper for the NSAttributeString function from iOS 6.
On that note, if you were only supporting iOS 6 and iOS 7, then I would definitely change all of your NSString's sizeWithFont:... to the NSAttributeString's boundingRectWithSize. It'll save you a lot of headache if you happen to have a weird multi-threading corner case! Here's how I converted NSString's sizeWithFont:constrainedToSize::
What used to be:
NSString *text = ...;
CGFloat width = ...;
UIFont *font = ...;
CGSize size = [text sizeWithFont:font
constrainedToSize:CGSizeMake(width, CGFLOAT_MAX)];
Can be replaced with:
NSString *text = ...;
CGFloat width = ...;
UIFont *font = ...;
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:text
attributes:#
{
NSFontAttributeName: font
}];
CGRect rect = [attributedText boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX)
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
CGSize size = rect.size;
Please note the documentation mentions:
In iOS 7 and later, this method returns fractional sizes (in the size
component of the returned CGRect); to use a returned size to size
views, you must use raise its value to the nearest higher integer
using the ceil function.
So to pull out the calculated height or width to be used for sizing views, I would use:
CGFloat height = ceilf(size.height);
CGFloat width = ceilf(size.width);
For linebreak issue:
- (CGFloat)heightNeededForText:(NSString *)text withFont:(UIFont *)font width:(CGFloat)width lineBreakMode:(NSLineBreakMode)lineBreakMode {
NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = lineBreakMode;
CGSize size = [text boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX)
options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading)
attributes:#{ NSFontAttributeName: font, NSParagraphStyleAttributeName: paragraphStyle }
context:nil].size;
return ceilf(size.height);
}
Swift version of the Alexander of Norway's answer...
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);
}
In the code where you want to get the height just call the method like below...
let size = self.heightNeededForText(text as NSString, withFont: UIFont.systemFontOfSize(15.0), width: scrollView.frame.size.width - 20, lineBreakMode: NSLineBreakMode.ByWordWrapping) //Can edit the font size and LinebreakMode
I have a little question. I developed an application that automatically fills a data set obtained from a SQLite database. These data are drawn from dynamic way, and between the data I have a frame where I insert labels dynamically. I never know the exact number of labels inside these frame because I take data from different tables of my Database. The problem I have with the labels which texts within them do not fill within the width of the label. I tried to use label.linebreakmode but still makes the break. I post the code:
There I have many objects taken from previous code, like widthFormato and widthImageFormato
if([tipoVino length]!=0){
UILabel *lblFormato = [[UILabel alloc] init];
labelX = ((widthFormato-widthImageFormatos) / 2)+10;
CGRect labelFrame = lblFormato.frame;
labelFrame.size.width = widthImageFormatos;
labelFrame.origin.x = labelX;
labelFrame.origin.y = labelY+25;
lblFormato.frame = labelFrame;
lblFormato.numberOfLines = 0;
lblFormato.lineBreakMode = NSLineBreakByWordWrapping;
[lblFormato setText:[NSString stringWithFormat:#"- %#",tipoVino]];
lblFormato.textColor = [UIColor whiteColor];
labelY = lblFormato.frame.origin.y;
[formatosImageView addSubview:lblFormato];
}
I think that you want to create labels with flexible height (not all have the same size), and must fix the width of formatosImageView.
EDITED FOR iOS7
I was using sizeWithFont that is deprecated in iOS7, I changed it for boundingRectWithSize
Try this:
UILabel *lblFormato = [[UILabel alloc] init];
lblFormato.numberOfLines = 0;
lblFormato.lineBreakMode = NSLineBreakByWordWrapping;
[lblFormato sizeToFit];
NSString *string = [NSString stringWithFormat:#"- %#", tipoVino];
[lblFormato setText: string];
//Calculate the size of the container of the lblFormato
CGSize size = [string boundingRectWithSize:CGSizeMake(widthImageFormatos, 2000) options:NSStringDrawingUsesLineFragmentOrigin attributes:#{NSFontAttributeName: [UIFont fontWithName:#"customFont" size:fontSize]} context:nil];
lblFormato.frame = CGRectMake(labelX, labelY + 25, size.width, size.height);
and you must update the labelY with:
labelY = lblFormato.frame.size.height;
Maybe it helps you.
With regards #spinillos answer, for iOS 7:
NSDictionary *attributes = #{ NSFontAttributeName : [UIFont systemFontOfSize:<#fontSize#>] };
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]
initWithString: <#string#>,
attributes:attributes];
CGRect frame = [attributedString boundingRectWithSize:CGSizeMake(<#width#>, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil];
Converting a project from iOS5.0 to iOS7 / iOS6 on Xcode 5. The code below is giving a compile time warning:
'sizeWithFont:constrainedToSize:lineBreakMode:'is deprecated: first deprecated in ios 7.0 - Use - boundingRectWithSize:options:attribiutes:context
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
self.lblHidden.frame = CGRectMake(58, 228, 945, 9999);
self.lblHidden.text = detailShareObj.pDesc;
CGSize size = [detailShareObj.pDesc sizeWithFont:self.lblHidden.font constrainedToSize:self.lblHidden.frame.size lineBreakMode:NSLineBreakByWordWrapping];
return 228.0+size.height+20;
}
else if (indexPath.section == 1)
{
NSString *tempPointStr = (self.shortDescArray)[indexPath.row];
self.lblHidden.frame = CGRectMake(58, 0, 945, 9999);
self.lblHidden.text = tempPointStr;
CGSize size = [tempPointStr sizeWithFont:self.lblHidden.font
constrainedToSize:self.lblHidden.frame.size
lineBreakMode:NSLineBreakByWordWrapping];
return 50.0f;
}
I tried some of the suggestion give elsewhere but nothing is up to rescue if some one can help by giving the corrections required in the code will be greatly appreciated.
I wouldn't just mask the deprecated function warning. They deprecated it for a reason. I believe the function was deprecated because that series of NSString+UIKit functions were based on the UIStringDrawing library, which wasn't thread safe. If you tried to run them not on the main thread (like any other UIKit functionality), you'll get unpredictable behaviors. In particular, if you ran the function on multiple threads simultaneously, it'll probably crash your app. This is why in iOS 6, they introduced a the boundingRectWithSize:... method for NSAttributedStrings. This was built on top of the NSStringDrawing libraries and is thread safe.
If you look at the new NSString boundingRectWithSize:... function, it asks for an attributes array in the same manner as a NSAttributeString. If I had to guess, this new NSString function in iOS 7 is merely a wrapper for the NSAttributeString function from iOS 6.
On that note, if you were only supporting iOS 6 and iOS 7, then I would definitely change all of your NSString's sizeWithFont:... to the NSAttributeString's boundingRectWithSize. It'll save you a lot of headache if you happen to have a weird multi-threading corner case! Here's how I converted NSString's sizeWithFont:constrainedToSize::
What used to be:
NSString *text = ...;
CGFloat width = ...;
UIFont *font = ...;
CGSize size = [text sizeWithFont:font
constrainedToSize:(CGSize){width, CGFLOAT_MAX}];
Can be replaced with:
NSString *text = ...;
CGFloat width = ...;
UIFont *font = ...;
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:text
attributes:#
{
NSFontAttributeName: font
}];
CGRect rect = [attributedText boundingRectWithSize:(CGSize){width, CGFLOAT_MAX}
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
CGSize size = rect.size;
Please note the documentation mentions:
In iOS 7 and later, this method returns fractional sizes (in the size
component of the returned CGRect); to use a returned size to size
views, you must use raise its value to the nearest higher integer
using the ceil function.
So to pull out the calculated height or width to be used for sizing views, I would use:
CGFloat height = ceilf(size.height);
CGFloat width = ceilf(size.width);
If you want it compatible with both iOS7 and the versions below it, try this one (with ARC):
CGSize size;
if ([tempPointStr respondsToSelector:
#selector(boundingRectWithSize:options:attributes:context:)])
{
NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
paragraphStyle.alignment = NSTextAlignmentLeft;
NSDictionary * attributes = #{NSFontAttributeName : self.lblHidden.font,
NSParagraphStyleAttributeName : paragraphStyle};
size = [tempPointStr boundingRectWithSize:self.lblHidden.frame.size
options:NSStringDrawingUsesFontLeading
|NSStringDrawingUsesLineFragmentOrigin
attributes:attributes
context:nil].size;
} else {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
size = [tempPointStr sizeWithFont:self.lblHidden.font
constrainedToSize:self.lblHidden.frame.size
lineBreakMode:NSLineBreakByWordWrapping];
#pragma clang diagnostic pop
}
Note: It's just an example for your else-if case, maybe you need to do some modification depend on what you want it be. ;)
For iOS7, replace:
CGSize size = [tempPointStr sizeWithFont:self.lblHidden.font
constrainedToSize:self.lblHidden.frame.size
lineBreakMode:NSLineBreakByWordWrapping];
With:
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping; //set the line break mode
NSDictionary *attrDict = [NSDictionary dictionaryWithObjectsAndKeys:self.lblHidden.font, NSFontAttributeName, paragraphStyle, NSParagraphStyleAttributeName, nil];
CGSize size = [tempPointStr boundingRectWithSize:self.lblHidden.frame.size
options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin
attributes:attrDict context:nil].size;
You can use:
UIFont *font = [UIFont boldSystemFontOfSize:16];
CGRect new = [string boundingRectWithSize:CGSizeMake(200, 300)
options:NSStringDrawingUsesFontLeading
attributes:#{NSFontAttributeName: font}
context:nil];
CGSize stringSize= new.size;
If you're targeting iOS 6.0+, you can still use sizeWithFont:constrainedToSize:lineBreakMode:. Just make sure that your project's iOS Deployment Target is set for 6.0, and the compiler won't give you these warnings.
(You can find this by clicking on the blue project tab (usually at the top of the left, project navigator pane) within the "info" section).
If you're only targeting iOS 7.0+, you should use the new method boundingRectWithSize:options:attributes:context.
You can find the Apple docs on this new method here.
The boundingRectWithSize:options:attributes:context has the problem, that it does not calculates the height correctly if the String contains "\n" (line breaks). Therefore this code calculates the size for each line separately for a given width (inWidth):
NSArray *brokenByLines=[string componentsSeparatedByString:#"\n"];
CGFloat height=0.0;
CGFloat maxWidth=0.0;
for (NSString* actString in brokenByLines) {
CGRect tSize=[actString boundingRectWithSize:CGSizeMake(inWidth, 600) options:(NSStringDrawingUsesLineFragmentOrigin | NSLineBreakByWordWrapping) attributes:#{NSFontAttributeName: inFont} context:nil];
if (maxWidth<tSize.size.width) {
maxWidth=tSize.size.width;
}
height+=tSize.size.height;
}
CGSize size= CGSizeMake(ceil(maxWidth), ceil(height));
I'm trying to use the attributed string API of iOS 6 to calculate the size of text and shrink the font size if necessary. However, I can't get it to work as the documentation says.
NSString *string = #"This is a long text that doesn't shrink as it should";
NSStringDrawingContext *context = [NSStringDrawingContext new];
context.minimumScaleFactor = 0.5;
UIFont *font = [UIFont fontWithName:#"SourceSansPro-Bold" size:32.f];
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.lineBreakMode = NSLineBreakByClipping;
NSDictionary *attributes = #{ NSFontAttributeName: font,
NSParagraphStyleAttributeName: paragraphStyle };
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:self.title attributes:attributes];
CGRect rect = [attributedString boundingRectWithSize:CGSizeMake(512.f, 512.f) options:NSStringDrawingUsesLineFragmentOrigin context:context];
NSLog(#"rect: %#, context: %#", NSStringFromCGRect(rect), context.debugDescription);
But the text doesn't shrink and is truncated. actualScaleFactor is always 1. The log results are:
rect:{{0, 0}, {431.64801, 80.447998}}, context:<NSStringDrawingContext: 0x14e85770> minimumScaleFactor:0.500000 minimumTrackingAdjustment:0.000000 actualScaleFactor:1.000000 actualTrackingAdjustment:0.000000 totalBounds:{{0, 0}, {431.64801, 80.447998}}
The result is the same if I use the actual drawing method and not the measuring method. If I remove the paragraph style, it makes the text wrap and doesn't shrink it. If I remove the paragraph style AND I choose a size that only allows one line of text, the text is truncated too instead of being shrunk. What is wrong? There is very little documentation or online resources dealing with NSStringDrawingContext. And I'm trying to avoid the use of sizeWithFont:minFontSize:actualFontSize:forWidth:lineBreakMode: which is deprecated in iOS 7.
NSStringDrawingContext's minimumScaleFactor appears to be broken in iOS 7.
As far as I can make out, even in iOS 6, it didn't work for drawing; it worked for measuring, so you could work out what would happen in a context where it does work for drawing, like a UILabel. That way, you know the correct minimum height for the label.
Or, you could use the resulting scale factor to shrink the text yourself, in the knowledge that now it will fit.
Example:
- (void)drawRect:(CGRect)rect
{
// rect is 0,0,210,31
NSMutableAttributedString* s =
[[NSMutableAttributedString alloc] initWithString: #"This is the army Mister Jones."];
[s addAttributes:#{NSFontAttributeName:[UIFont fontWithName:#"GillSans" size:20]}
range:NSMakeRange(0,s.length)];
NSMutableParagraphStyle* para = [[NSMutableParagraphStyle alloc] init];
para.lineBreakMode = NSLineBreakByTruncatingTail;
[s addAttributes:#{NSParagraphStyleAttributeName:para}
range:NSMakeRange(0,s.length)];
NSStringDrawingContext* con = [[NSStringDrawingContext alloc] init];
con.minimumScaleFactor = 0.5;
CGRect result =
[s boundingRectWithSize:rect.size
options:NSStringDrawingUsesLineFragmentOrigin context:con];
CGFloat scale = con.actualScaleFactor;
// ...(could have a check here to see if result fits in target rect)...
// fix font to use scale factor, and draw
[s addAttributes:#{NSFontAttributeName:[UIFont fontWithName:#"GillSans" size:20*scale]}
range:NSMakeRange(0,s.length)];
[s drawWithRect:rect options:NSStringDrawingUsesLineFragmentOrigin context:nil];
}
In iOS 6, scale is about 0.85 and you can use it as shown to shrink the text. But in iOS 7, scale remains at 1, suggesting that no shrinkage is happening and this feature of NSStringDrawingContext is now useless. I can't tell whether that's a bug or whether the feature has been deliberately abandoned.
After googling for a long time I did not find a solution working under iOS7. Right now I use the following workaround, knowing that it is very ugly. I render a UILabel in memory, take a screenshot and draw that. UILabel is able to shrink the text correctly.
But perhaps someone finds it useful.
UILabel *myLabel = [[UILabel alloc] initWithFrame:myLabelFrame];
myLabel.font = [UIFont fontWithName:#"HelveticaNeue-BoldItalic" size:16];
myLabel.text = #"Some text that is too long";
myLabel.minimumScaleFactor = 0.5;
myLabel.adjustsFontSizeToFitWidth = YES;
myLabel.backgroundColor = [UIColor clearColor];
UIGraphicsBeginImageContextWithOptions(myLabelFrame.size, NO, 0.0f);
[[myLabel layer] renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[screenshot drawInRect:myLabel.frame];
Just wanted to post this solution as I have been battling with this for a couple hours. I could never get the text area to scale down and would always have the last lines of text cut off.
The solution for me was to not add a context and just set it to nil. I got this when looking at the example on this site. https://littlebitesofcocoa.com/144-drawing-multiline-strings
Note after getting the size the box would draw at using
pageStringSize = [myString boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrsDictionary context:nil];
I still needed to loop through scaling down the font manually:
while (pageStringSize.size.height > 140 && scale > 0.5) {
scale = scale - 0.1;
font = [UIFont fontWithName:#"Chalkboard SE" size:24.0 *scale];
attrsDictionary = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName,[NSNumber numberWithFloat:1.0], NSBaselineOffsetAttributeName, nil];
pageStringSize = [myString boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrsDictionary context:nil];
}