代码如下:
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ NSString *text = [textField text]; NSLog(@"Tf3"); NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"]; string = [string stringByReplacingOccurrencesOfString:@" " withString:@""]; if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) { return NO; } text = [text stringByReplacingCharactersInRange:range withString:string]; text = [text stringByReplacingOccurrencesOfString:@" " withString:@""]; NSString *newString = @""; while (text.length > 0) { NSString *subString = [text substringToIndex:MIN(text.length, 4)]; newString = [newString stringByAppendingString:subString]; if (subString.length == 4) { newString = [newString stringByAppendingString:@" "]; } text = [text substringFromIndex:MIN(text.length, 4)]; } newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]]; if (newString.length >= 24) { return NO; } [self changeCommitBtn]; [textField setText:newString]; //是否改变提交按钮状态 //[self changeCommitBtn]; return NO; }更多问题,欢迎加群讨论:565191947