IOS UITextField 设置光标位置

 textField.leftView = [[[UIView alloc] initWithFrame:CGRectMake(, , , )] autorelease];
 textField.leftView.userInteractionEnabled = NO;
 textField.leftViewMode = UITextFieldViewModeAlways;

// Text 垂直居中
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;