On Mar 17, 2009, at 10:16 PM, Jim Correia wrote:
On Mar 17, 2009, at 10:14 AM, Li Fumin wrote:
Hi,all.I am new to cocoa. I am reading Aaron Hillegass's Book
"Cocoa Programming for Mac OS X".
I have got some problems with challenge 2 of Chapter 20.I have a
custom NSView called BigLetterView, and then it show the input
letter on the view.Now I want to make the letter which I just
inputted appears in italics. So, I define this method:
- (IBAction) isItalic: (id) sender
{
if ([italicBox state])
{
NSFontManager *fontManager = [NSFontManager
sharedFontManager];
[fontManager convertFont: [NSFont fontWithName: @"Helvetica"
size: 75]
toHaveTrait:
NSItalicFontMask];
}else {
NSFontManager *fontManager = [NSFontManager
sharedFontManager];
[fontManager convertFont: [NSFont fontWithName: @"Helvetica"
size: 75]
toHaveTrait:
NSUnitalicFontMask];
}
[self setNeedsDisplay: YES];
}
When I click the italics check button. Nothing happens. How do I
suppose to make this wok?
How can I get the font the letter is using?
Look at the API doc and method prototype for -
convertFont:toHaveTrait:.
It returns a new font. You discard the return value, and don't
update any of your own state, so I'm not sure how you envisioned
this to work.
In the case where you want to remove the italic attribute, you
should be using -convertFont:toNotHaveTrait:.
Does one get the same results (Italic) when you use the
NSObliquenessAttributeName attribute? Or are these totally different?
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