Question

我有四个UITextField，并希望限制每个define MAXLENGTH 5 define MAXQTY 3 define MAXSIZE 4 define MAXBRAND 10 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{ int lengtha = [brand.text length] ; NSLog(@"lenghta = %d",lengtha); if (lengtha >= MAXBRAND && ![string isEqualToString:@""]) { brand.text = [brand.text substringToIndex:MAXBRAND]; return NO; } return YES; int lengthb = [qty.text length] ; NSLog(@"lenghtb = %d",lengtha); if (lengthb >= MAXQTY && ![string isEqualToString:@""]) { qty.text = [qty.text substringToIndex:MAXQTY]; return NO; } return YES; int lengthc = [size.text length] ; NSLog(@"lenghtc = %d",lengtha); if (lengthc >= MAXSIZE && ![string isEqualToString:@""]) { size.text = [size.text substringToIndex:MAXSIZE]; return NO; } return YES; int lengthd = [price.text length] ; NSLog(@"lenghtd = %d",lengtha); if (lengthd >= MAXLENGTH && ![string isEqualToString:@""]) { price.text = [price.text substringToIndex:MAXLENGTH]; return NO; } return YES; }的长度，但它们都是不同的长度。到目前为止，我有以下代码，但它不能正常工作

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Answer 1

如果品牌，数量，尺寸和价格是实例变量（或属性）并连接到您的UITextFields，您可以尝试这样做：

define MAXLENGTH 5
define MAXQTY 3
define MAXSIZE 4
define MAXBRAND 10

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if (textField == brand) {
        int lengtha = [brand.text length];
        NSLog(@"lenghta = %d",lengtha);
        if (lengtha >= MAXBRAND && ![string isEqualToString:@""]) {
            brand.text = [brand.text substringToIndex:MAXBRAND];
            return NO;
        }
        return YES;
    } else if (textField == qty) {
        int lengthb = [qty.text length];
        NSLog(@"lenghtb = %d",lengthb);
        if (lengthb >= MAXQTY && ![string isEqualToString:@""]) {
            qty.text = [qty.text substringToIndex:MAXQTY];
            return NO;
        }
        return YES;
    } else if (textField == size) {
        int lengthc = [size.text length];
        NSLog(@"lenghtc = %d",lengthc);
        if (lengthc >= MAXSIZE && ![string isEqualToString:@""]) {
            size.text = [size.text substringToIndex:MAXSIZE];
            return NO;
        }
        return YES;
    } else if (textField == price) {
        int lengthd = [price.text length];
        NSLog(@"lenghtd = %d",lengthd);
        if (lengthd >= MAXLENGTH && ![string isEqualToString:@""]) {
            price.text = [price.text substringToIndex:MAXLENGTH];
            return NO;
        }
        return YES;
    }
    return YES;
}

限制多个UITextField的长度

1 个答案: