iOS 控件

1. UITextView

限制字长

http://blog.csdn.net/fengsh998/article/details/45421107

 光标位置

http://blog.csdn.net/ouy_huan/article/details/7513108

UITextView　*_textView=[[UITextView alloc]initWithFrame:self.view.frame];

_textView.text=textString;

_textView.selectedRange=NSMakeRange(0,0) ;   //起始位置

_textView.selectedRange=NSMakeRange(textString.length,0);

3， 自定义控件

http://blog.csdn.net/iamfreedom2011/article/details/18698403