iOS 精确控制textField输入的小数位数

直接在代理方法中写代码

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {    if (textField == yourTextField) {        NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string]; //得到输入框的内容        if ([toBeString containsString:@"."]) {            NSRange subRange = [toBeString rangeOfString:@"."];            if (toBeString.length - subRange.location > 3) { //如果输入框小数点后大于2位小数                textField.text = [toBeString substringToIndex:toBeString.length - 1];                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"最多保留2位小数哦!" delegate:nil cancelButtonTitle:@"好的" otherButtonTitles:nil, nil];                [alert show];                return NO;            }        }    }    return YES;}