iOS开发-限制文本框输入两位小数和最大值

Posted 2022-12-03 sunshine-zzz

要求： 1.第一个首字母不能是小数点 2.最大限制是10000 3.保留小数点后两位

 < UITextFieldDelegate >
_testText . delegate = self ;

- ( BOOL )textField:( UITextField *)textField shouldChangeCharactersInRange:( NSRange )range replacementString:( NSString *)string             NSString *amountText = _testText . text ; NSString *regStr = @"^([1-9][\\\\d]0,100|0)(\\\\.[\\\\d]0,1)?$" ; NSPredicate *predicate = [ NSPredicate predicateWithFormat : @"SELF MATCHES %@" , regStr]; BOOL match = [predicate evaluateWithObject :amountText]; if ([string isEqualToString : @"" ]) return YES ;     //始终允许用户删除         unichar single = [string characterAtIndex : 0 ]; //当前输入的字符
    if ([textField. text length ] == 0 )                         if (single == '.' )                             [ SVProgressHUD showErrorWithStatus : @"第一个数字不能为小数点" ];                                     [textField. text stringByReplacingCharactersInRange :range withString : @"" ];                             return NO ;                                 NSString *tmpStr = [amountText stringByAppendingString :string];     NSString *numStr = [[tmpStr componentsSeparatedByString : @"." ] firstObject ];     NSInteger amount = [numStr integerValue ];     if (([amountText integerValue ] == 10000 ) && (![string isEqualToString : @"" ])) return NO ;     BOOL result = [amountText isEqualToString : @"" ] ? YES : (match && ((amount <= 10000 ) || [string isEqualToString : @"." ]));     return result;