给UITextView加边框

    _answerTextView = [[UITextViewalloc] initWithFrame:CGRectMake(10.0,10.0, 300.0, 390.0)];

    [_answerTextViewsetEditable:NO];

    

   _answerTextView.layer.backgroundColor = [[UIColorclearColor]CGColor];

   _answerTextView.layer.borderColor = [[UIColorcolorWithRed:230.0/255.0green:250.0/255.0blue:250.0/255.0alpha:1.0]CGColor];

   _answerTextView.layer.borderWidth =3.0;

   _answerTextView.layer.cornerRadius =8.0f;

    [_answerTextView.layersetMasksToBounds:YES];