關(guān)于iOS的文本框有時(shí)需要限制字?jǐn)?shù)，如手機(jī)號(hào)，在UITextField的代理單純寫一個(gè)判斷，在字?jǐn)?shù)超過限制時(shí)，這時(shí)再想刪除就刪除不掉，可以在代理這樣寫，就解決
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ if (!string.length) { return YES; } if (textField.keyboardType == UIKeyboardTypeNumberPad) { if ([string rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location != NSNotFound) { return NO; } } NSString *updatedText = [textField.text stringByReplacingCharactersInRange:range withString:string]; if (updatedText.length > 11) // 4 was chosen for SSN verification { if (string.length > 1) { // BasicAlert(@"", @"This field accepts a maximum of 4 characters."); } return NO; } return YES;}
新聞熱點(diǎn)
疑難解答
圖片精選
網(wǎng)友關(guān)注
