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- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { //Check that response should be a maximum 5 characters if ([string length] > 0) { return [textField.text length] < 5; } return YES; } -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { if([string length]>0{ return [textField.text length]<5; //这里报错,textField没有 text属性? } return YES; }