哪個計數UITextField和UITextView中的最大字符數

Question

哪一個計數UITextField和UITextView中的最大字符數？對我來說真的很有趣！我有一些textfields和textviews。如果我沒有爲它設置最大值，那麼可以在哪個數字中包含char？

Answer 1

您需要實現UITextFieldDelegate和UITextViewDelegate方法得到的字符個數

試試這個代碼

對於UITextView中的

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { 
    NSUInteger enteredTextLength; // Variable to store the length on entered string. 

    if(textView == txtViewName) { 
     enteredTextLength = [textView.text length] + [text length] - range.length; 

     NSLog(@"Text Length = %d", enteredTextLength); 

     // To check number of characters entered. 
     if (enteredTextLength < 10) { 
      return YES; 
     } 
     else { 
      return NO; 
     } 
    } 
    else { 
     return YES; 
    } 
} 

爲UITextField的

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { 

    NSUInteger enteredTextLength; // Variable to store the length on entered string. 

    if(textField == txtAlpha) { 
     enteredTextLength = [textField.text length] + [string length] - range.length; 

     NSLog(@"Text Length = %d", enteredTextLength); 

     // To check number of characters entered. 
     if (enteredTextLength < 10) { 
      return YES; 
     } 
     else { 
      return NO; 
     } 

    } 
    else { 
     return YES; 
    } 
}