core-text

问题 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

问题 I have the following sample code which works on iPhone. It draws the text "Hello World!" on the screen using Core Text. Dropping this code into a cocoa project in an NSView produces different results. The font size is scaled much bigger and the letters are drawn on top of each other. How do I have the text draw the same in the cocoa app? - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CFStringRef font_name =

问题 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] . 回答1: 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

问题 I created simple NSLayoutManager subclass that allows to set custom layout location for defined substrings: class PositionableLayoutManager: NSLayoutManager { var xOffsetsPerGlyphRange = [(NSRange, CGPoint)]() override func invalidateLayoutForCharacterRange(charRange: NSRange, actualCharacterRange actualCharRange: NSRangePointer) { super.invalidateLayoutForCharacterRange(charRange, actualCharacterRange: actualCharRange) for (range, offset) in xOffsetsPerGlyphRange { setLocation(offset,

问题 My purpose : Draw outline of every glyph example1: input: text= "666棒" display: Attach ：In the figure above, 1 is displayView,2 is inputView. example2: input : text= "666😁棒" display : Attach： In the figure above, 1 is displayView,2 is inputView,3 is nothing rendered. Main ideas is : Use CoreText obtained every CGglyph. Get every glyph's CGPath Use CAShapeLayer display the glyph on screen. Main method: let letters = CGMutablePath() let font = CTFontCreateWithName(fontName as CFString?,

问题 I focus on a project to add image support based on OmniGroup's rtf editor.I met the problem when I use CTFramesetterCreateWithAttributedString , and it receives EXC_BAD_ACCESS which is caused by a zombie object. For simplicity, I get the NSAttributedString from a rtfd file which only has a photo. I add the method to parser the image tag on iOS based on the Omni's sample. And the part to create the NSAttributedString is followed by this tutorial from raywenderlich, and looks like:

问题 I have a UILabel with the string 'LA'. I also have a CATextLayer with the same characters in an NSAttributedString assigned to its string property. The kerning in the UILabel is noticeably different from the CATextLayer . Here's the code. - (void)viewDidLoad { [super viewDidLoad]; // // UILabel // UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(20, 50, 280, 100)]; label1.text = @"LA"; label1.backgroundColor = [UIColor clearColor]; label1.font = [UIFont fontWithName:@"Futura" size

问题 Hej fellows, I'm currently trying to convert a letter and/or multiple of them to a CGPathRef for manually drawing them into a custom UIView. I tried the way over CoreText and Framesetters including this little snippet but it doesn't seem to work.... NSAttributedString *stringToDraw = [[NSAttributedString alloc] initWithString:content attributes:nil]; // now for the actual drawing CGContextRef context = UIGraphicsGetCurrentContext(); // flip the coordinate system // draw CTFramesetterRef

问题 I am dealing with loading a TTF from Resource only. This question helped me answer part 1. But now I need a NSFont from a CGFont or CTFont. This is for a Mac only application. 回答1: How to get an NSFont from a CGFont Use CTFontCreateWithGraphicsFont . How to get an NSFont from a CTFont Do nothing. You already have one. NSFont and CTFont are toll-free bridged, so a CTFont is an NSFont and vice versa. 来源： https://stackoverflow.com/questions/4942711/how-do-i-get-an-nsfont-object-from-a-cgfont-or

问题 I'm guessing that it's to make a string out of individual CATextLayers and then position them as required along the curve, then animate. Because that's what's I've got working now, but it loses Kerning. Here's how: Why isn't my curved text centering itself? But is Core Text more performant and able to avoid the whole "drawing into a context" nonsense that slows everything down compared to the lean, mean Core Animation way of doing things, and respect kerning? i.e. avoiding drawRect: and all