iOS 6.0 setAttributedText崩溃

Question

- (IBAction)pinFieldChanged:(id)sender {
    UITextField *pinField = sender;
    float kerninig = 76.0;

    NSAttributedString *attributedString =
        [[NSAttributedString alloc]
        initWithString:pinField.text
        attributes:
        @{
            NSFontAttributeName : [UIFont fontWithName:@"Helvetica Neue" size:36],
            NSForegroundColorAttributeName : [UIColor colorWithRed:130.0/255.0 green:130.0/255.0 blue:130.0/255.0 alpha:1.0],
            NSKernAttributeName : @(kerninig)
        }];
    if ([pinField respondsToSelector:@selector(setAttributedText:)]) {
     [pinField setAttributedText:attributedString];
    }

}

My app is crashing under ios6.0 when i'm trying to set attributed text to text field, though this selector is available iOS 6.0 and later

Can you give me any idea why this could happen?

Thanks in advance!)

Answer 1

iOS5 may be expects a CTFont so use

 NSString* s = @"Yo ho ho and a bottle of rum!";
    NSMutableAttributedString* mas = [[NSMutableAttributedString alloc]  initWithString:s];
    __block CGFloat f = 18.0;
    CTFontRef basefont = CTFontCreateWithName((CFStringRef)@"Baskerville", f, NULL);

https://github.com/mattneub/Programming-iOS-Book-Examples/blob/master/iOS5bookExamples/ch23p689styledText1/p579p593styleText1/RootViewController.m

use below ios 6

 NSAttributedString *stringValue= [[NSAttributedString alloc] initWithString:@"cocoalibrary.blogspot.com" attributes:@{NSForegroundColorAttributeName: [UIColor redColor]}];

Answer 2

NSAttributedString is not available below than IOS 6. See this link , you can found this line.

In iOS 6 and later you can use attributed strings to display formatted text in text views, text fields, and some other controls