iOS textview排版

- (IBAction)changeText:(id)sender {

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

    paragraphStyle.alignment = NSTextAlignmentCenter;

    paragraphStyle.paragraphSpacing = 12.0f;

    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];

    attributes[NSParagraphStyleAttributeName] = paragraphStyle;

    attributes[NSFontAttributeName] = [UIFont fontWithName:@"Futura" size:20.0f];

    attributes[NSForegroundColorAttributeName] = [UIColor colorWithRed:1.0f green:0 blue:0 alpha:1.0f];

    NSAttributedString *attriStr = [[NSAttributedString alloc] initWithString:self.mytextView.text attributes:attributes];

    self.mytextView.attributedText = attriStr;

}