UITextView添加行距

- (void)textViewDidChange:(UITextView *)textView
{
    // 判断是否有候选字符，如果不为nil，代表有候选字符
    if(textView.markedTextRange == nil){
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.lineSpacing = 5.0f; // 字体的行间距
        paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
        
        NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:14],
                                     NSParagraphStyleAttributeName:paragraphStyle
                                     };
        textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];
    }
}