I have a localized string:
"%# some text" = "%# some text";
The format specifier %# may appear in any location in the localized string.
The problem is this string should be an NSAttributedString; the %# replacement and the rest of the text should have different attributes. How can I solve this issue?
1) Get your localized template using NSLocalizedString().
2) Get the text to insert.
3) Combine the two using -stringWithFormat:.
4) In the template, find the location of the placeholder using -rangeOfString:
5) Find the range of the inserted text in the formatted string, using the start position found in the last step, with -rangeOfString:options:range:. (The third argument here is the range within which to search; this avoids finding non-substituted text.)
6) Create an attributed string from the formatted string, using the range to apply attributes to the inserted text.
You can use NSMutableAttributedString for this case. Here is Apple documentation
NSString *textToDisplay = [NSString stringWithFormat:#"%# somet text",localizedString];
NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:textToDisplay];
[attrStr addAttribute:NSFontAttributeName
value:[UIFont fontWithName:#"Exo2-Regular" size:30]
range:NSMakeRange(0, locatilzedString.length)];
[attrStr addAttribute:NSFontAttributeName
value:[UIFont fontWithName:#"Exo2-Bold" size:30]
range:NSMakeRange(locatilzedString.length, attrStr.length)];
label.attributedText = attrStr
Related
ALL,
I am looking for a way to properly insert a hyperlink into the NSTextView.
Trying to do that I found this link which explains how to make it work. However trying to set the following text:
abc http://www.google.com
I failed to do so with the following code:
std::string test = "abc \"http://www.google.com\"";
int pos1 = test.find( "http://" );
std::string temp1 = test.substr( 0, pos1 );
[tv setString:temp1];
std::string url_text = test.substr( pos1 );
NSMutableAttributedString string = [[NSMutableAttributedString alloc] init];
NSURL *url_obj = [NSURL URLWithString:url];
[string appendAttributedString:[NSAttributedString hyperlinkFromString:url_text withURL:url_obj];
[[tv textStorage] setAttributedString: string];
[string release];
however, the underlining and the blue foreground starts from the very first position of the text, i.e. the whole text is underlined, and not just a link.
So looking further I found I can just simply do this. But neither setting the above string, nor trying to type the link gives me the appropriate visible representation of the link - blue and underlined font.
So now my questions are:
Is it possible to do an automatic parsing of the hyperlink in NSTextView when I both set the text and type the text manually?
If not, what is the problem with the code above and why I see the link on all string and not just the text of the link?
I hope I will not need to do any manual work and everything will be automatic.
Thank you and sorry for such a big post.
I'm building an UITextView with text and images (Subclassing NSTextstorage for displaying my content)
I'm having textcontent with images URLs.
So my problem is that i need download all the images if they're not cached.
So i want to first insert a placeholder image, download the image and then replace the placeholder image by the downloaded one.
Here's how i do my stuff.
First, i'm formatting my text with images url by replacing all urls with this tag :
[IMG]url[/IMG]
Then i'm using a regex to get all these tags.
I'm testing if there's a cached image or not. If not, i extract all the urls, download them and cache them.
I've created an NSObject class ImageCachingManager and declared a delegate method called when an image has been downloaded :
#protocol ImageCachingManagerDelegate <NSObject>
- (void)managerDidCacheImage:(UIImage *)image forUrl:(NSString *)url;
#end
Like this, I tough that I could use the url of the image got by the delegate method to search the matching url in my NSTextstorage attributedString and replace the current NSTextattachement image by the downloaded one.
But I don't know how to do that...
Thanks for help !
I'm working on something very similar to this at the moment and think this might help. The code is very much alpha but hopefully it will get you to the next step - I'll step through:
Overall Cycle
1. Find you image tags in the full text piece using Reg Ex or XPath - personally i find Hppl to be more powerful but if your content is well structured and reliable, regex is probably fine.
https://github.com/topfunky/hpple
Reduce the space of this match to 1 character and store that range - A textAttachment occupies only 1 character of space within a textview so it's best to reduce this to 1 otherwise when you replace your first match of characters in a range with the first textattachment the next range marker becomes out of date which will lead to issues. Depending on how much processing you need to do this text input during init, this is an important step, i have to do a lot of processing on the text and the ranges change during this parsing so I created an array of special characters that I know is never going to be in the inputs and push these single characters into the reserved space, at the same time i store this special character and the src of the image in an array of a very simple NSObject subclass that stores the SpecialChar, ImgSrc plus has space for the NSRange but i basically find the special character later in the process again because it has been moved about since this point and then set the nsrange at the very end of processing - this may not be necessary in your case but the principle is the same; You need a custom object with NsRange (which will become a text attachment) and the imgSource.
Loop through this array to add placeholder imageAttachments to your attributed string. You can do this by adding a transparent image or a 'loading' image. You could also check your cache for existing images during this point and skipping the placeholder if it exists in cache.
Using your delegate, when the image is successfully downloaded, you need to replace the current attachment with your new one. By replacing the placeholder in the range you've already stored in your object. Create a placeholder attributedString with the NSTextAttachment and then replace that range as below.
Some sample code:
Steps 1 & 2:
specialCharsArray = [[NSArray alloc]initWithObjects:#"Û", #"±", #"¥", #"å", #"æ", #"Æ", #"Ç", #"Ø", #"õ", nil];
//using Hppl
NSString *allImagesXpathQueryString = #"//img/#src";
NSArray *imageArray = [bodyTextParser searchWithXPathQuery:allImagesXpathQueryString];
//
imageRanges = [[NSMutableArray alloc] init];
if([imageArray count]){
for (TFHppleElement *element in imageArray) {
int i = 0;
NSString *imgSource = [[[element children] objectAtIndex:0] content];
NSString *replacementString = [specialCharsArray objectAtIndex:i];
UIImage *srcUIImage = [UIImage imageNamed:imgSource];
[srcUIImage setAccessibilityIdentifier:imgSource]; //only needed if you need to reference the image filename later as it's lost in a UIImage if stored directly
//imagePlacement is NSObject subclass to store the range, replacement and image as above
imagePlacement *foundImage = [[imagePlacement alloc]init] ;
[foundImage initWithSrc:srcUIImage replacement:replacementString];
[imageRanges addObject:foundImage];
i++;
}
Step 3:
-(void)insertImages{
if ([imageRanges count]) {
[self setScrollEnabled:NO]; //seems buggy with scrolling on
int i = 0; //used to track the array placement for tag
for(imagePlacement *myImagePlacement in imageRanges){
// creates a text attachment with an image
NSMutableAttributedString *placeholderAttString = [[NSMutableAttributedString alloc]initWithAttributedString:self.attributedText];
NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
//scales image down to ration of width of view - you probably don't need this
CGSize scaleToView = imagePlacement.imgSrc.size;
scaleToView.width = self.frame.size.width;
scaleToView.height = (self.frame.size.width/imagePlacement.imgSrc.size.width)*imagePlacement.imgSrc.size.height;
attachment.image = [self imageWithColor:[UIColor clearColor] andSize:scaleToView];
NSMutableAttributedString *imageAttrString = [[NSAttributedString attributedStringWithAttachment:attachment] mutableCopy];
[self setAttributedText:placeholderAttString];
i++;
}
}
[self setScrollEnabled:YES];
}
- (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize) size {
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
By default implementors of the IMKTextInput protocol displays marked text of the current input session underlined (with 2 pixel black underline according to documentation). I develop specific Input Method and would like to use another formatting, say, without underlining but with background color. I've tried attributed string with empty format:
NSString *buffer = /* getting some buffered text */;
NSMutableAttributedString *text = [[[NSMutableAttributedString alloc] initWithString:buffer attributes:[NSDictionary dictionary]] autorelease];
// client is of type id<IMKTextInput>, of course
[client setMarkedText:text selectionRange:NSMakeRange(0, [text length]) replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
but with no avail. So, how can I change format of marked text? Is it possible?
I Have an NSTextView.
I just want to add an Attribute (an NSLinkAttributeName) to the selected Text in the NSTextView...
Can You Help me ?
Thanks.
You want to get the view's textStorage (which is basically a mutable attributed string), then add the NSLinkAttributeName attribute to the selected range; the value of that attribute is the URL to link to.
[[textView textStorage] addAttribute: NSLinkAttributeName value: url range:[textView selectedRange]];
Been a while since I played with ObjC but this should do the trick. It replaces the selected text with the original content with your attr appended. Checked through it but please excuse any typos.
NSTextView *textView = ...;
NSDictionary *attributes = ...;
//Get selected text string from TextView (see Text superclass) and append attr link
NSRange selRange = [textView selectedRange];
NSMutableString *changedStr = [[[textView string] substringWithRange:selRange] mutableCopy];
[changedStr appendString:[attributes objectForKey:NSLinkAttributeName]];
//Replace the selected text range in the TextView
[textView replaceCharactersInRange:selRange withString:[NSString stringWithString:changedStr]];
[changedStr release];
See class defs:
http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSText_Class/Reference/Reference.html
-replaceCharactersInRange:withString:
-selectedRange
-scrollRangeToVisible: if you want to present your change immediately
http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html
substringWithRange:
I've Declared a string Like so
NSString* fileName = [files objectAtIndex:i];
NSLog(fileName);
NSImage* imageFromBundle = [[NSImage alloc] initWithContentsOfFile:fileName];
and want to use that filename to open a file in a different directory.
I came up with this
NSImage* imageFromBundle2;
imageFromBundle2 = [[NSImage alloc] initWithContentsOfFile:#"/Users/rhaynes/Documents/works4/" filename ];
Any help would be appreciated
I'll assume that your fileName string is actually a file name, like "myImage.png". A lot of the Objective-C docs refer to a file name when they really mean file path - so sometimes it's confusing.
What you want to do is create an NSString that represents the complete path to the file you want to load. For instance, you could say:
NSString * path = [NSString stringWithFormat: #"/Users/rhaynes/Documents/works4/%#", fileName];
That line creates a new NSString using the format string and parameters provided (the %# in the format string indicates that the string value of fileName should be inserted there.) StringWithFormat is a really powerful function, so you should definitely check it out in the docs.
Then you could call initWithContentsOfFile:path, and it should give you the image you want.
NSString* fileName = [files objectAtIndex:i]; NSLog(fileName);
Don't pass non-hard-coded strings as format-string arguments. If they contain format specifiers, you'll get garbage or a crash. (Try this with fileName = #"foo%sbar", for example. Then try it with fileName = #"foo%fbar" for even more fun.)
Your NSLog statement should be:
NSLog(#"%#", fileName);
[I] want to use that filename to open a file in a different directory. I came up with this
NSImage* imageFromBundle2; imageFromBundle2 = [[NSImage alloc] initWithContentsOfFile:#"/Users/rhaynes/Documents/works4/" filename ];
You can only concatenate string literals this way; as you've no doubt seen for yourself, this is a syntax error when one of the strings isn't a literal.
First off, if fileName is actually a pathname, you'll need to use lastPathComponent to get the actual filename. So:
NSString *path = [files objectAtIndex:i];
NSString *filename = [path lastPathComponent];
Then, use stringByAppendingPathComponent: to tack this onto the new superpath.
NSString *desiredFilenamePath = [directoryPath stringByAppendingPathComponent:filename];
Now you have the pathname you wanted to pass to NSImage's initializer.