UIPickerView 不改变字体 iOS 9.1

Question

我尝试用这行代码更改标题中的字体。我怎样才能完成这项工作？

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component
{
NSString *title;
UIFont *font;

title = [[countriesToCitiesDic objectForKey:selectedCountryName]objectAtIndex:row];
font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];

UIColor *textColor;

textColor = [UIColor whiteColor];

NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.alignment = NSTextAlignmentCenter;

NSDictionary *attributes = @{NSForegroundColorAttributeName : textColor,
                             NSFontAttributeName : font,
                             NSParagraphStyleAttributeName : paragraphStyle};

return [[NSAttributedString alloc] initWithString:title attributes:attributes];
}

Answer 1

我试过了，效果很好：

- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component{

    NSString *title = [[countriesToCitiesDic objectForKey:selectedCountryName]objectAtIndex:row];
    UIFont *font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];

    UIColor *textColor = [UIColor whiteColor];

    NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
    paragraphStyle.alignment = NSTextAlignmentCenter;

    NSDictionary *attributes = @{NSForegroundColorAttributeName : textColor,
                                            NSFontAttributeName : font,
                                  NSParagraphStyleAttributeName : paragraphStyle};

    return [[NSAttributedString alloc] initWithString:title attributes:attributes];
}

Answer 2

你可以试试这个：

    - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, pickerView.frame.size.width, 44)];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor whiteColor];
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18];
label.text  = [[countriesToCitiesDic objectForKey:selectedCountryName]objectAtIndex:row];
return label;
}

UIPickerView 不改变字体 iOS 9.1

UIPickerView not change font iOS 9.1

objective-c

uipickerview