I am drawing a NSString using drawAtPoint (drawInRect, that makes no big difference).
There is a parameter to set the line break mode, but has anyone an idea how to append "..." to strings if they are truncated?
One option is, to check whether the string is short enough. If that is not the case, iteratively remove the last character until the string length + 3 euqals the maximum length.
I am sure there is a better solution. Anyone an idea?
Best,
heinrich
You'd better to use another NSString method:
- (CGSize)drawAtPoint:(CGPoint)point
forWidth:(CGFloat)width
withFont:(UIFont *)font
lineBreakMode:(UILineBreakMode)lineBreakMode
And specify UILineBreakModeTailTruncation as lineBreakMode.
Updating answer since drawAtPoint:forWidth:withFont:lineBreakMode: has been deprecated since iOS 7.0. Instead, you can now use drawInRect:withAttributes:
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
NSDictionary *textAttributes = #{NSFontAttributeName : [UIFont systemFontOfSize:20.0f],
NSParagraphStyleAttributeName : paragraphStyle};
[text drawInRect:textRect withAttributes:textAttributes];
You can use the NSStringDrawingTruncatesLastVisibleLine option with the NSStringDrawingUsesLineFragmentOrigin value.
[_text drawWithRect:_textRect options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil];
Related
How to change the color of the UILabel text gradually like the following link?
Can any one suggest me some code?
You can use formatted text.
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:#"Hello World"];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(1,5)];
iOS < 6
Second you need to subclass UILabel and print this string inside the drawRect method. You need to create a some type of loop that changes the color according to the speech speed.
iOS 6
You can use the attributedTextproperty (no need to subclass)
(void)drawTextInRect:(CGRect)rect
or reuse code:
https://github.com/mattt/TTTAttributedLabel
The app that you linked [http://www.youtube.com/watch?v=_vOYvaNhSHw] , probably is maded using cocos2d.
In cocos2d, you can change text color easily also with animation.
Here an example:
http://www.cocos2d-iphone.org/forum/topic/5903
Here cosos2d sdk, i suggest to try, because it's very powerful:
http://www.cocos2d-iphone.org/
enjoy.
here is one of my sample code. using block method of TTTAttributedLabel class it may help you .
[cell.lblAtt setText:strAtt afterInheritingLabelAttributesAndConfiguringWithBlock:^NSMutableAttributedString *(NSMutableAttributedString *mutableAttributedString) {
UIFont *italicSystemFont = [UIFont boldSystemFontOfSize:12];
CTFontRef italicFont = CTFontCreateWithName((__bridge CFStringRef)italicSystemFont.fontName, italicSystemFont.pointSize, NULL);
NSUInteger lenght = [[tempObj objectForKey:#"username"] length];
NSUInteger lenght2 = [[NSString stringWithFormat:#"%d",[tempArr count]] length];
[mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)[ThemeColor CGColor] range:NSMakeRange(0,lenght)];
[mutableAttributedString addAttribute:(NSString*)kCTFontAttributeName value:(__bridge UIFont*)italicFont range:NSMakeRange(0,lenght)];
[mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)[ThemeColor CGColor] range:NSMakeRange(lenght+11,lenght2)];
[mutableAttributedString addAttribute:(NSString*)kCTFontAttributeName value:(__bridge UIFont*)italicFont range:NSMakeRange(lenght+11,lenght2)];
return mutableAttributedString;
}];
Use NSAtributedString in UILabel from iOS 6.0. For lesser version below iOS 6.0 use TTTAttributedLabel which supports NSAtributedString
Change attributed string according to your requirement by setting it again in UILabel
EDIT add colored text as u want for example in loop
For 1st second in Label : I am good boy.
For 2nd second in Label : I am good boy.
For 3rd second in Label : I am good boy.
For 4th second in Label : I am good boy.
For 5th second in Label : I am good boy.
I am having a problem that in iOS I am using UILabel to display 2,3 line text, I want to align text as justified but I am not finding any option to do so. Any suggestions how to make justify text in label?
i put these line to make start it from top
CGSize maximumSize = CGSizeMake(300, 9999);
NSString *textString = someString;
UIFont *textFont = [UIFont fontWithName:#"Futura" size:14];
CGSize textStringSize = [textString sizeWithFont:textFont
constrainedToSize:maximumSize
lineBreakMode:text.lineBreakMode];
CGRect textFrame = CGRectMake(10, 110, 300, textStringSize.height);
text.frame = textFrame;
so any trick like this to make it justfiy
Thanks
There is now a convenient way to justify text since iOS6. You can create an instance of NSAttributedString, set appropriate properties and assign this attributed string to a text representing view such as UILabel, UITextView, etc. It's easy as this:
Create an instance of NSMutableParagraphStyle and set its properties.
NSMutableParagraphStyle *paragraphStyles = [[NSMutableParagraphStyle alloc] init];
paragraphStyles.alignment = NSTextAlignmentJustified; //justified text
paragraphStyles.firstLineHeadIndent = 10.0; //must have a value to make it work
Create NSDictionary for text attributes and create attributed string.
NSDictionary *attributes = #{NSParagraphStyleAttributeName: paragraphStyles};
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString: string attributes: attributes];
Set attributed string to a label.
existingLabel.attributedText = attributedString;
Can't be done I'm afraid - well not with UILabel.
You can use the UIWebView or a 3rd party library such as OHAttributedLabel
Happy Coding :)
Update:
This answer has been obsolete since iOS6. Please refer to Tankista's answer.
As mentionned by #martin, my class OHAttributedLabel can make this very easily.
(You will find it on my github and also find plenty of references to it on SO as well)
It can be done easily, but you need to use Core Text.
subclass a UIView, add an NSString property, create an NSAttributedString and pass kCTJustifiedTextAlignment value for the kCTParagraphStyleSpecifierAlignment key, then draw the NSAttributedString using Quartz or CoreText in your drawrect method.
edit: kCTParagraphStyleSpecifierAlignment key kCTJustifiedTextAlignment value should be used to create a CTParagraphStyleRef struct and passed in as a value for kCTParagraphStyleAttributeName key when creating the NSAttributedString.
SWIFT 4.x
version of approved answer:
Create an instance of NSMutableParagraphStyle and set its properties.
let justifiedParagraphStyles: NSMutableParagraphStyle = NSMutableParagraphStyle.init()
justifiedParagraphStyles.alignment = .justified //justified text
justifiedParagraphStyles.firstLineHeadIndent = 10.0 //must have a value to make it work
Create NSDictionary for text attributes and create attributed string.
let attributes = [NSAttributedStringKey.paragraphStyle: justifiedParagraphStyles]
let attributedString = NSAttributedString.init(string: string, attributes: attributes)
Set attributed string to a label.
existingLabel.attributedText = attributedString
Is there anyway I can get the truncated version of the text for a UILabel?
In short, I have a paragraph of text, and two UILabels - label A, which is 2 lines long, and label B, which is a variable height. Label A is above label B. The idea is that label A shows the first two lines of the paragraph of text, and upon a certain user action, label B because visible and displays the rest of the text.
I'm having trouble determining what should go in label B, as I don't know what's being shown in label A. I'd need to also remove the "..." from label A.
Note: I realize this is a bit convoluted but there are some good reasons for it, which I won't clutter up the question with.
I wonder if you could use the methods in the NSString UIKit Additions to figure out how much fits into label A.
A crude way might be to start with the first character of your text and test for the size it would take up (-sizeWithFont:forWidth:lineBreakMode: maybe?) and then keep adding characters one at a time until it doesn't fit into your label A any more.
I hope somebody else can come up with a better way to do this, but the above should work.
Update
Last night I looked a bit into Core Text for my own app and came across CTFramesetterSuggestFrameSizeWithConstraints. You could maybe use this to figure out how much of your string fits into the label, by looking at the fitRange in that function.
Update 2:
I think this should work, but I have just typed this in here, so it may not even compile:
UIFont *uiFont = [UIFont systemFontOfZise:13.0f]; // whichever font you're using
CTFontRef ctFont = CTFontCreateWithName((CFStringRef)uiFont.fontName, uiFont.pointSize, NULL);
NSDictionary *attr = [NSDictionary dictionaryWithObject:(id)ctFont forKey:(id)kCTFontAttributeName];
CFRelease(ctfont);
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:yourLabelText attributes:attr];
CTFrameSetterRef frameSetter = CTFrameSetterCreateWithAttributedString((CFAttributedStringRef)attrString);
[attrString release];
CFRange fitRange;
CTFrameSetterSuggestFrameSizeWithConstrains(
frameSetter,
CFRangeMake(0, 0),
NULL,
CGSizeMake(labelWidth, labelHeight),
&fitRange);
CFRelease(frameSetter);
CFIndex numberOfCharactersThatFit = fitRange.length;
thanks to Thomas Müller
be sure to set line break mode the myLabel to this:
myLabel.lineBreakMode = NSLineBreakByWordWrapping;
by this method you can get chunked strings that actually fit in the constrained size.
Here is the baked code:
- (NSArray *)truncate:(NSString *)text
{
NSMutableArray *textChunks = [[NSMutableArray alloc] init];
NSString *chunk = [[NSString alloc] init];
CTFramesetterRef frameSetter;
UIFont *uiFont = [UIFont systemFontOfSize:17.0f];
CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef)uiFont.fontName, uiFont.pointSize, NULL);
NSDictionary *attr = [NSDictionary dictionaryWithObject:(__bridge id)ctFont forKey:(id)kCTFontAttributeName];
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:text attributes:attr];
CFRange fitRange;
while (attrString.length>0) {
frameSetter = CTFramesetterCreateWithAttributedString ((__bridge CFAttributedStringRef) attrString);
CTFramesetterSuggestFrameSizeWithConstraints(frameSetter, CFRangeMake(0,0), NULL, CGSizeMake(myLabel.frame.size.width, myLabel.frame.size.height), &fitRange);
CFRelease(frameSetter);
chunk = [[attrString attributedSubstringFromRange:NSMakeRange(0, fitRange.length)] string];
[textChunks addObject:chunk];
[attrString setAttributedString: [attrString attributedSubstringFromRange:NSMakeRange(fitRange.length, attrString.string.length-fitRange.length)]];
}
return textChunks;
}
For Label A, calculate approximate character that should fit perfectly for two lines, for the particular font you are using.
For label B, set variable Height that the whole text must fit into it.
I have the following code:
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
NSString *currentMessage = [FeedMessages objectAtIndex:indexPath.row];
NSLog(currentMessage);
UIFont *font = [UIFont systemFontOfSize:14];
NSLog([NSString stringWithFormat:#"Height: %#",[currentMessage sizeWithFont:font forWidth:270 lineBreakMode:UILineBreakModeWordWrap].height]);
return [currentMessage sizeWithFont:font forWidth:270 lineBreakMode:UILineBreakModeWordWrap].height;
}
Can anybody tell me why "[currentMessage sizeWithFont:font forWidth:270 lineBreakMode:UILineBreakModeWordWrap].height" is always returning null or nil?
I've checked and currentMessage is populated correctly.
Any ideas?
Go through this question. It describes that - you must have to use, CGFLOAT_MAX or see following code ( grabbed from there . )
NSString *text = #"A really long string in here";
CGSize theSize = [text sizeWithFont:[UIFont boldSystemFontOfSize:18.0f] constrainedToSize:CGSizeMake(265.0f, CGFLOAT_MAX) lineBreakMode:UILineBreakModeWordWrap];
NSString *stringHeight = [NSString stringWithFormat:#"%f", theSize.height];
You are not using NSLog() in correct format. it should be
NSLog(#" %#",[NSString stringWithFormat:#"Height: %f",[currentMessage sizeWithFont:font forWidth:270 lineBreakMode:UILineBreakModeWordWrap].height]);
and %f should be used for float.
Apart from your flawed type juggling which has been noted above, sizeWithFont:forWidth:lineBreakMode: only measures dimensions of the (truncated) first line, oddly enough.
you want to use sizeWithFont:constrainedToSize:lineBreakMode: which actually splits text over lines and takes the lines into account. Use a CGSizeMake(270.0f,999999.0f) to get the full height of the text.
see http://developer.apple.com/iphone/library/documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html
I spent 2 hours on this, freaking out. For me the problem was in such a small and stupid thing: I had a 'release' mode switched on. So, when going with debugger, it was stopping at the proper code lines (no idea why debugger should do that in release mode), but didn't show what I expected.
I'm loading some help text from a plist and displaying the same in the form of UILabels housed in a UIScrollView. Portion of the code follows:
UILabel *sectionDetailLabel = [[[UILabel alloc] initWithFrame:CGRectMake(34, myOriginForThisSection, 286, 20)] autorelease];
sectionDetailLabel.backgroundColor = [UIColor clearColor];
sectionDetailLabel.numberOfLines = 0;
sectionDetailLabel.font = [UIFont systemFontOfSize:12];
sectionDetailLabel.textColor = [UIColor blackColor];
sectionDetailLabel.textAlignment = UITextAlignmentLeft;
sectionDetailLabel.lineBreakMode = UILineBreakModeWordWrap;
[baseScrollView addSubview:sectionDetailLabel];
[sectionDetailLabel setText:myStringForThisSection];
[sectionDetailLabel sizeToFit];
While any 'long' text is getting wrapped into multiple lines correctly, I'm unable to manually insert any line-breaks using newline '\n' characters in 'myStringForThisSection'. I only see the characters '\' and 'n' printed in the UILabel wherever I wanted the line-break, instead.
I looked this up and the general consensus seemed to be that setting numberOfLines to 0, setting the lineBreakMode to a valid value and invoking sizeToFit (or setting the frame of the UILabel based on sizeWithFont:) should do. All of which I seem to be doing in the code above - and works perfectly when fitting long strings of unknown length into multiple lines on the UILabel. So what could be missing here?
Note: All the variables used - baseScrollView, myStringForThisSection and myOriginForThisSection - were loaded before the above code began executing, and work fine.
UILabel doesn't interpret the escape sequence \n. You can insert the real character that represents the Carriage Return and/or the Line Feed. Make a char to hold your newline and then insert it.
unichar newLine = '\n';
NSString *singleCR = [NSString stringWithCharacters:&newLine length:1];
[myStringForThisSection insertString:singleCR atIndex:somePlaceIWantACR];
As long as your myStringForThisSection is mutable, that should do it.
I had trouble with Scot Gustafson's answer above in XCode 4.3
Try this instead:
unichar chr[1] = {'\n'};
NSString *cR = [NSString stringWithCharacters:(const unichar *)chr length:1];
Then use in your code something like this:
self.myLabel.text = [NSString stringWithFormat:#"First Label Line%#Second Label Line", cR];
I couldn't get Scott & DoctorG's solution to work (though I didn't spend too much time trying), but here's the simple solution that works for me when I'm extracting escaped text from an xml file.
Inside my string function class, I define:
+(NSString)escapeXml:(NSString*)string {
return [string stringByReplacingOccurrencesOfString:#"\\n" withString:#"\n"];
}