A simple test that is failed: Make a new project with just one subview (UITextView) and put the following in:
- (void)viewDidLoad
{
[super viewDidLoad];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineHeightMultiple = 50.f;
paragraphStyle.lineSpacing = 100.f;
paragraphStyle.minimumLineHeight = 200.f;
paragraphStyle.maximumLineHeight = 500.f;
UIFont *font = [UIFont fontWithName:#"AmericanTypewriter" size:24.f];
self.textView.attributedText = [[NSAttributedString alloc] initWithString:
#"This is a test.\n Will I pass?" attributes:
#{NSParagraphStyleAttributeName : paragraphStyle, NSFontAttributeName : font}];
}
Line spacing is the same as if the attribute were not there. Has anything got this to work successfully? I put in ridiculous numbers just to show that it won't change...
This is a bug in NSHTMLWriter which is the private class which UITextView uses to convert attributedText into HTML. Internally it displays this HTML via a UIWebDocumentView. Read more on the inner workings of UITextView in my writeup here: http://www.cocoanetics.com/2012/12/uitextview-caught-with-trousers-down/
The problem comes from an easy to miss speciality in the font CSS shorthand. If you specify a pixel size with the font shorthand then this sets BOTH the font-size as well as the line-height. Since NSHTMLWriter puts the font AFTER the line-height this causes the line-height to be cancelled out by the font size.
See here for my Radar which includes the full analysis of the bug: http://www.cocoanetics.com/2012/12/radar-uitextview-ignores-minimummaximum-line-height-in-attributed-string/
I suggest you file a bug report as well and mention my Radar #12863734.
I don't know if this is enough for your purposes but I could adjust the line spacing by setting the minimum and maximum line height. Furthermore to use a font I put it into the font property of the text view rather than passing it as the value of NSFontAttributeName in the attributes dictionary. (Maybe this part is not (well) documented?)
About your attributes
lineSpacing is calculated from the bottom of the line to the bottom of the upper line and that space is constrained to values between minimumLineHeight and miximumLineHeight. What I am trying to say is that maybe some values in your attributes are cancelling or overriding others.
Also if you need to just adjust the spacing between line you probably don't need to use paragraphStyle.lineHeightMultiple :)
The code
This worked for me:
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.minimumLineHeight = 35.f;
paragraphStyle.maximumLineHeight = 35.f;
UIFont *font = [UIFont fontWithName:#"AmericanTypewriter" size:18.f];
NSString *string = #"This is a test.\nWill I pass?\n日本語のもじもあるEnglish\nEnglish y Español";
NSDictionary *attributtes = #{
NSParagraphStyleAttributeName : paragraphStyle,
};
self.textView.font = font;
self.textView.attributedText = [[NSAttributedString alloc] initWithString:string
attributes:attributtes];
Additional Notes
There seems to be a situation with Japanese/Chinesse and maybe other characters mixed with alphabet characters in the same line. It will make that line to have a bigger leading to solve that you need to set up the minimum and maximum line height as I did.
You can see the problem when rendering my example without attributes.
Setting maximumLineHeight seems to resolve this issue for me;
CGFloat fontSize = 22.f;
titleLabel.font = [UIFont boldSystemFontOfSize:fontSize];
NSMutableParagraphStyle *paragraphStyle = [[[NSMutableParagraphStyle alloc] init] autorelease];
paragraphStyle.maximumLineHeight = fontSize/2;
titleLabel.attributedText = [[[NSAttributedString alloc]
initWithString:#"This is a test.\nWill I pass?"
attributes: #{ NSParagraphStyleAttributeName : paragraphStyle,
NSFontAttributeName : titleLabel.font}]
autorelease];
For this particular string you need to set paragraphSpacing instead. What's about lineSpacing, I believe it's just not supported yet on iOS.
As nacho4d answered, in iOS 6 you need to use minimumLineHeight and maximumLineHeight and set font directly in UITextView, not in NSAttributedString as line height in that case will be overridden.
Please note that when you set font in UITextView, the "editable" property of UITextView should be set to YES, in other case attributed text would not be affected.
These issues are present only in iOS 6. In iOS 7 and above everything is ok;
In my case, none of the paragraph styling was working. The fix was to set the attributed text on the label AFTER doing any frame adjustments on the label. :)
Related
I am trying to "forecast" what the size of a label is going to be (width is known, only height).
I am trying to use this:
CGSize possibleSize = [text sizeWithFont:[UIFont fontWithName:#"American Typewriter" size:16]
constrainedToSize:CGSizeMake(self.collectionView.frame.size.width ,9999)
lineBreakMode:NSLineBreakByWordWrapping];
Which gives very inaccurate results (even changing the fonts and the size won't make it better, for example I get the height 30 instead of 80).
I have read that other people also don't get good results with it. Am I using it right?
I have also tried:
UILabel *test=[[UILabel alloc] initWithFrame:self.collectionView.frame];
test.text=[dic objectForKey:#"text"];
test.font=[UIFont fontWithName:#"American Typewriter" size:12];
[test sizeToFit];
NSLog(#"%f",test.frame.size.height);
I have to know what the height is going to be, and this method is not even close.
Is there some other way that gives reasonable results?
This sizeWithFont method is now deprecated, this new method works best
NSString *content = **Whatever your label's content is expected to be**
CGSize maximumLabelSize = CGSizeMake(self.label.frame.size.width, 9999);
NSDictionary *stringAttributes = [NSDictionary dictionaryWithObject:[UIFont fontWithName:#"American Typewriter" size:16] forKey: NSFontAttributeName];
CGSize expectedLabelSize = [content boundingRectWithSize:maximumLabelSize options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin attributes:stringAttributes context:nil].size;
CGFloat labelHeight = expectedLabelSize.height;
where labelHeight is the height that the label will be calculated from the amount of text due to load into the label.
I hope this helps, cheers, Jim.
#matt you are onto something, but I'll add that you should set the number of lines on that label to 0, before you calculate sizeWithFont.
You may also try to replace
CGSizeMake(self.collectionView.frame.size.width ,9999)
with
CGSizeMake(self.collectionView.bounds.size.width ,FLT_MAX)
the key element being "bounds" instead of frame.
Lastly, ensure you're not getting nothing for [dic objectForKey:#"text"].
Use
NSAssert(dic[#"text"]);
if ([dic[#"text"] isEqualToString:""]) {
; //empty string
}
First of all you need to allow a UILabel to be multiline, by default it is one line (set number of line to 0)
yourLabel.numberOfLines = 0; // means - label can be multiline
Secondly, it looks like you are calculating size for a bigger font that the label has in fact. Consider using the same size so set the calculations correctly.
Moreover if you support only iOS 7 and newer consider usage of sizeWithAttributes method introduced in iOS 7 or boundingRectWithSize:options:attributes:context - replacement for the method you use from iOS 7 and further for text size calculations.
Finally (advice) if you need that height value only for setting height of the label maybe you should consider using auto layout (it will be much easier to deal with).
I have a UITextView with multiple lines. Each text for each line will be taken from database and will be shown on UITextView. Since text per line is predefined, text for a particular line should not be shown on another line. It works fine for me. But TextView is not justified. How can i justify TextView's text without changing text per line. Would you please help me.
You may set the property "textAlignment" of UITextView like this:
textView.textAlignment = NSTextAlignmentJustified;
NSMutableAttributedString *title = [[NSMutableAttributedString alloc]initWithString:#"your custom string with '\n' between each line"];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setAlignment:NSTextAlignmentJustified];
[title addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, title.length)];
titleView.attributedText = title;
I'm trying to create a custom “Change font” NSPopupButton for a Mac App (not an iOS App). I can detect a change in font selection:
long fontItemIndex = [fontPopup indexOfSelectedItem];
NSMenuItem *fontItem = [fontPopup itemAtIndex:(int)selectedFontItemIndex];
NSString *fontName = [selectedFontItem title];
Given this NSString of a font name, I cannot seem to find out how to actually change the selected text in my NSTextView textView to this new font.
I'm simply dazzled by the official documentation: it seems convertFont:toFamily: is what I need. When I do this:
NSFont *font = [NSFont fontWithName:fontName size:12.0];
[textView setFont:font];
It sets all text in the text view, not just the selected text. But when I do this:
NSFontManager *fontManager = [NSFontManager sharedFontManager];
[fontManager convertFont:[fontManager selectedFont] toFamily:fontName];
it doesn't do a thing. What am I missing?
Inside a NSTextView is a NSTextStorage (a subclass of NSAttributedString) and you’ll have to modify the attribute named NSFontAttributeName.
First get the range where you want to change the font attribute:
NSRange selection = textView.selectedRange;
Now add the font attribute to the selection:
NSFont *font = [NSFont fontWithName:fontName size:12.0f];
[self.textView.textStorage addAttributes:#{NSFontAttributeName: font}
range:selection];
Depending on the contents of your NSPopUpButton it should be enough to call fontWithName:size: with title as the font name to get the just selected font. But if the method you already do doesn’t work, you’ll probably have to get a specific font from the font family name. availableMembersOfFontFamily: on NSFontManager will give you a list of all available fonts. You can use one of them to initialize a specific font.
Take a look at the setFont:range: method on NSText, the superclass of NSTextView.
(The ranges, of course, come from the selectedRanges property on NSTextView.)
This was all I needed to change all the text in my textview.
[textview setFont:[NSFont fontWithName:#"Courier" size:14]];
I'm trying to add a nice looking shadow to a NSTextViews string, I have this Code so far:
NSShadow *textShadow = [[NSShadow alloc] init];
textShadow.shadowColor = [[NSColor blackColor]
colorWithAlphaComponent:0.3];
textShadow.shadowOffset = NSMakeSize(5.0, -5.0);
textShadow.shadowBlurRadius = 3;
NSDictionary *d = #{NSShadowAttributeName : textShadow,
NSFontAttributeName : [NSFont fontWithName:#"Arial Black" size:36.0],
NSStrokeWidthAttributeName : [NSNumber numberWithFloat:-3.0],
NSStrokeColorAttributeName : [NSColor whiteColor]};
[tv setTypingAttributes:d];
all in all this brings up a pretty looking Drop shadow on the right and the bottom of the string in the NSTextView but because the internal drawing mechanism of the textview seems to draw the "fill" of the Characters first and then the stroke around it, the Shadow lays above the fill of the text in the upper left of the Chars, which looks very bad as you can see here(would post an Image but not enough reputation right now 8-/ )
Is there a better way to add the shadow or a way to "raise" the fill color of the String so it lays above the shadow or is this kind of a Bug in the Foundation framework?
Thanks and greetings,
Alex.
I use NSTextField not NSTextView to receive the user input, but I need to custom the font and textColor and line spacing. I use the code below, it's ok for font and color but I don't know how to set a line spacing.
[self.titleField setTextColor:textColor];
[self.titleField setFont:bold14];
And I also use a NSAttributedString to solve the problem:
NSFont *bold14 = [NSFont boldSystemFontOfSize:14.0];
NSColor *textColor = [NSColor redColor];
NSMutableParagraphStyle *textParagraph = [[NSMutableParagraphStyle alloc] init];
[textParagraph setLineSpacing:10.0];
NSDictionary *attrDic = [NSDictionary dictionaryWithObjectsAndKeys:bold14, NSFontAttributeName, textColor, NSForegroundColorAttributeName, textParagraph, NSParagraphStyleAttributeName, nil];
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:title attributes:attrDic];
[self.titleField setAllowsEditingTextAttributes:YES];
[self.titleField setAttributedStringValue:attrString];
the code above is ok to show a attributed string, but when I delete the string in the textfield and start to input, the words come without any attribute.
How can I input a string in NSTextField with custom font, color and line spacing?
It's best to stay with NSTextField's attribute setting methods instead of an NSAttributedString because then it can send the settings to the field editor. Every text field has an NSTextView (most of the time) "Field Editor"; and the field editor is what is doing the editing.
Your NSAttributedString isn't sticking because you're only telling the textfield to temporarily display that one string. When the field editor pops up the text field (cell) passes on its own attributes like textField.font and textField.textColor but never the NSAttributedString's attributes.
It would be best to use an NSTextView to be able to use -setDefaultParagraphStyle because you're editing multiple lines anyways, from what I see. If you can't, because of performance problems or something else, then:
Subclass NSTextFieldCell, because that's what does all the NSTextField work, and override
- (NSText *)setUpFieldEditorAttributes:(NSText *)textObj
(declared in NSCell) to set up attributes for your field editor the way you want it, so you can send it a line height value through -setDefaultParagraphStyle (and font etc.) yourself. (textObj is the field editor to be set up).