core-text

I'm currently struggling with the need to display strikethrough text in many UITableViewCell s. Something that written in HTML would looke like <strike>€99</strike> save 50% => now €49 I don't want to use a UIWebView just for a single line of text, especially that it's used in small UITableViewCell s. I know there are reusable cells and all, but I'd like to keep things the more memory-efficient way possible. So... I'm using NSAttributedString s, with the help of AliSoftware's UILabel -replacement OHAttributedLabel . The fact that it's only available starting with iOS 4.0 is no problem, as we

If I set textLayer.wrapped = YES , how do I resize textLayer to contain the wrapped text? I.e., how do I get the new height of the textLayer ? Basically, I want something like -[UILabel sizeToFit] . The first thing you need to do is get the size of the text. Thankfully, the NSString UIKit Additions Reference offers a method to do exactly that: - (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(UILineBreakMode)lineBreakMode That will give you a CGSize that you can then use to set the frame of your UILabel or whatever subclass of UIView that you're using. So,

I need to get info about my attributed string but can't figure out how. I'm getting this dictionary: 2013-11-04 18:06:10.628 App[1895:60b] { NSColor = "UIDeviceWhiteColorSpace 0.3 1"; NSFont = "<UICTFont: 0x17d8d4c0> font-family: \".HelveticaNeueInterface-MediumP4\"; font-weight: bold; font-style: normal; font-size: 17.00pt"; NSUnderline = 0; } It is easy to check the underline with: [attrs objectForKey:@"NSUnderline"] But how to get info about font like the font-style, font-weight etc. Thanks for any help You get the font from: UIFont *font = attrs[NSFontAttributeName]; The issue is

With the release of iOS 9.1, we got a lot of cool new emoji like taco (🌮)! I'm working on an application where I'd like to show the new emoji characters on devices where they are supported but keep them hidden on devices where they are not. Is there a way to determine if a given emoji character (contained in an NSString) can be rendered on the device the app is running on? After quite a bit of digging on SO and experimenting I've come up with a solution which I will post as an answer below, but please let me know if there's a better way. // Determine if the emoji character provided in the

The CTFontRef provides excellent method such as CTFontGetGlyphsForCharacters for mapping character(s) to glyph(s). My question is, is there any method for invert mapping? That is say, can I get characters(s) by given glyph(s)? Since I found there is a CTFontCopyCharacterSet for getting all supported characters, I think there will be some nice solutions. I think you may end up having to parse the font’s mapping tables yourself. You can obtain access to the tables using CGFontCopyTableForTag() ; the table you're after is the ' cmap ' table, the format of which is documented here: http://www

For some reason I'm unable to get NSTextAttachment images to draw when using core text, although the same image would display fine when the NSAttributedString is added to an UILabel. On iOS this rendering will give empty spaces for the NSTextAttachments, for OS X, a placeholder [OBJECT] square image is rendered for each NSTextAttachment instead. Is there something else that needs to be done in order to render images with CoreText? The rendering code: CGFloat contextHeight = CGBitmapContextGetHeight(context); CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge

Please help me understand the problem with the following code: NSString *fontName = @"ArialMT"; CGFloat fontSize = 20.0; CTFontRef fontRef = CTFontCreateWithName((CFStringRef)fontName, fontSize, NULL); NSString *characters = @"ABC"; NSUInteger count = characters.length; CGGlyph glyphs[count]; if (CTFontGetGlyphsForCharacters(fontRef, (const unichar*)[characters cStringUsingEncoding:NSUTF8StringEncoding], glyphs, count) == false) NSLog(@"*** CTFontGetGlyphsForCharacters failed."); Any help is appreciated. rob mayoff You are getting a C string containing UTF-8 encoded characters and then casting