UITextField,UITextView字数限制

//标题限制在 30个字以内

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (range.location>=30)
{
UIAlertView *alertNums = [[UIAlertView alloc]initWithTitle:@"输入提示" message:@"标题字数限制在30字以内！" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alertNums show];
return  NO;
}
else
{
return YES;
}

}
//内容限制在100个字以内;

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if (range.location>=100)
{
UIAlertView *alertNums = [[UIAlertView alloc]initWithTitle:@"输入提示" message:@"内容限制在100字以内！" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
[alertNums show];
return  NO;
}
else
{
return YES;
}
}