iOS 中 UITextView 限制最大輸入字數

 

顯示UITextView最大輸入字數的代碼

 

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    //如果是刪除減少字數，都返回允許修改
    if ([text isEqualToString:@""]) {
        return YES;
    }
    if (range.location>= MaxCount)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}
- (void)textViewDidChange:(UITextView *)textView {
    [self updateRemainCount];
}
- (void)updateRemainCount {
    long count = MAX(0, (int)(MaxCount - self.textView.text.length));
    self.lbRemainCount.text = [NSString stringWithFormat:@"當前可輸入文字：%ld",count];
}