use of undeclared NSForegroundColorAttributeName error in iphone

Question

In my i want to i'm displaying a text in text view.Also i want to change the color of some sentences in that text.When i'm using the code below i'm getting the error NSForegroundColorAttributeName undeclared and i also tried using kCTForegroundColorAttributeNamevalue but is also showing undeclared error.How to remove this error.Can any one help me please.

enter code here


NSMutableAttributedString * string = [[NSMutableAttributedString alloc]   initWithString:@"Paint a picture together, alternating every minute (use a timer to keep track)"];
[string addAttribute:kCTForegroundColorAttributeNamevalue:[UIColor redColor] range:NSMakeRange(0,8)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(8,10)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(10,5)];

Answer 1

On iOS its a PITA... Here is how I am making a white color and applying it to a range

First

 #import <Foundation/NSAttributedString.h>

Then

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

 CGFloat components[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 CGColorRef whiteColor = CGColorCreate(colorSpace, components);

 CGColorSpaceRelease(colorSpace);

 [mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(__bridge id)whiteColor range:titleRange];

 CGColorRelease(whiteColor);

I happen to be using ARC, so take out the __bridge if you have to.

Answer 2

You need to import CoreText/CoreText.h to get the declaration of kCTForegroundColorAttributeName .

The value must be a CGColor , not a UIColor .

There's less casting to do this way:

CFAttributedStringSetAttribute((__bridge void*)string, CFRangeMake(0, 8),
    kCTForegroundColorAttributeName, [UIColor redColor].CGColor);

Answer 3

Have you imported the AppKit framework? Also, include NSAttributedString.h in your header file.