iOS 中 UITextView 限制最大输入字数

 1 -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
 2 {
 3     //如果是删除减少字数，都返回允许修改
 4     if ([text isEqualToString:@""]) {
 5         return YES;
 6     }
 7     if (range.location>= MaxCount)
 8     {
 9         return NO;
10     }
11     else
12     {
13         return YES;
14     }
15 }
16 - (void)textViewDidChange:(UITextView *)textView {
17     [self updateRemainCount];
18 }
19 - (void)updateRemainCount {
20     long count = MAX(0, (int)(MaxCount - self.textView.text.length));
21     self.lbRemainCount.text = [NSString stringWithFormat:@"当前可输入文字：%ld",count];
22 }