Ios 如果选中两个值，NSString应该是。。。？

我已经在iOS应用程序中创建了复选框。我试图编写这样的代码：“如果选中框8，选中框9，self.skillSet=“第一句和第二句”。我该怎么做？目前，我的代码显示如下：

如果勾选框8，则self.skillSet=句子一-如果勾选框9，则self.skillSet=句子二

ViewController.m

- (IBAction)oralCheck:(id)sender {

    if (!checked8) {
        [self.oralValue setImage:[UIImage imageNamed:@"checkedwhite.png"] forState:UIControlStateNormal];
        checked8 = YES;

        self.skillSet = @"Sentence One";
        NSLog(@"%@", self.skillSet);
    }
    else if (checked8) {
        [self.oralValue setImage:[UIImage imageNamed:@"uncheckedwhite.png"] forState:UIControlStateNormal];
        checked8 = NO;
    }
}

- (IBAction)injectedCheck:(id)sender {

    if (!checked9) {
        [self.injectValue setImage:[UIImage imageNamed:@"checkedwhite.png"] forState:UIControlStateNormal];
        checked9 = YES;

        self.skillSet = @"Sentence Two";
        NSLog(@"%@", self.skillSet);
    }
    else if (checked9) {
        [self.injectValue setImage:[UIImage imageNamed:@"uncheckedwhite.png"] forState:UIControlStateNormal];
        checked9 = NO;
    }
}

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不知道你在问什么，但这是真的吗

if checked9 && checked8 {
    self.skillSet = "Sentence one and sentence two"
}

---

通过这种方式你也可以实现

if (checked9 && checked8) {
     self.skillSet = [self.skillSet stringByAppendingString:@" "];
     self.skillSet = [self.skillSet stringByAppendingString:@"and sentence Two"];
}

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啊，是的。好吧，那么新的问题：checked9前面的！是否表示“如果框9未选中”？将切换布尔值（真->假和假->真）