在ios5中高效地添加具有空值的NSDictionary键

我试图在字典中添加一些带有键的值，以便将请求发布到服务器。我在ios7上没有问题，但在ios5中创建字典时有问题，当输入空值时，它不会在字典中插入该键或随后插入该键。这是我的代码示例

NSLog(@"name:%@, address:%@,city:%@, state:%@, country:%@, postal:%@ ,phone:%@,age:%@, gender:%@",self.pop.firstNameTextField.text,self.pop.addressTextField.text, self.pop.cityTextField.text,[NSNumber numberWithInt:stateId],[NSNumber numberWithInt:countryId],self.pop.postalCodeTextField.text,self.pop.phoneNumberTextField.text,self.pop.ageTextField.text,self.pop.genderTextField.text);


NSDictionary *details = [NSDictionary dictionaryWithObjectsAndKeys:
                          self.pop.firstNameTextField.text,@"name",
                          self.pop.addressTextField.text,@"address",
                          self.pop.cityTextField.text,@"city",
                          [NSNumber numberWithInt:stateId],@"state",
                          [NSNumber numberWithInt:countryId],@"country",
                          self.pop.postalCodeTextField.text,@"postalCode",
                          self.pop.phoneNumberTextField.text,@"phoneNo",
                          self.pop.ageTextField.text,@"age",
                          self.pop.genderTextField.text,@"gender",
                          nil];


NSLog(@"MyDetails:%@",details);

在ios 7中记录结果：

name: GamerLegend,address:india,city:, state:1, country:1, postal: ,phone:, age:, gender:
MyDetails:
{
    address = India;
    age = "";
    city = "";
    country = 1;
    gender = "";
    name = "GamerLegend";
    phoneNo = "";
    postalCode = "";
    state = 1;
}

name: GamerLegend,address:haripad,city:(null), state:1, country:1, postal:(null) ,phone:(null), age:(null), gender:(null)
MyDetails:
{
    address = India;
    name = "GamerLegend";
}

ios5中的相同日志结果：

name: GamerLegend,address:india,city:, state:1, country:1, postal: ,phone:, age:, gender:
MyDetails:
{
    address = India;
    age = "";
    city = "";
    country = 1;
    gender = "";
    name = "GamerLegend";
    phoneNo = "";
    postalCode = "";
    state = 1;
}

name: GamerLegend,address:haripad,city:(null), state:1, country:1, postal:(null) ,phone:(null), age:(null), gender:(null)
MyDetails:
{
    address = India;
    name = "GamerLegend";
}

我希望ios5的日志与ios7的日志相同。我做了一些搜索，我知道我可以事先比较这个值，检查它是否为null，然后用空字符串添加到字典中。但那将是如此乏味。我想知道是否还有其他简单的解决方法。有没有更好的解决办法

这是我目前的解决方案

-(void) checkForNull
{

    if([self.pop.firstNameTextField.text length] == 0)
        self.pop.firstNameTextField.text=@"";

    if([self.pop.addressTextField.text length] == 0)
        self.pop.addressTextField.text=@"";

    if([self.pop.cityTextField.text length] == 0)
        self.pop.cityTextField.text=@"";

    if([self.pop.postalCodeTextField.text length] == 0)
        self.pop.postalCodeTextField.text=@"";

    if([self.pop.phoneNumberTextField.text length] == 0)
        self.pop.phoneNumberTextField.text=@"";

    if([self.pop.ageTextField.text length] == 0)
        self.pop.ageTextField.text=@"18";

    if([self.pop.genderTextField.text length] == 0)
        self.pop.genderTextField.text=@"";
}

---

如果它符合您的要求，则应该可以：

创建预期键的数组。然后循环执行此操作，并将其与字典中allKeys方法的输出进行比较。如果缺少一个密钥，您可以添加一个空字符串[NSNull null]，或者任何可以漂浮您的船的东西。（当然，您需要使字典可变）

大概是这样的：

for (NSString *expectedKey in allExpectedKeys) {
    BOOL keyMissing = YES;
    for (NSString *existingKey in [dictionary allKeys]) {

        if ([expectedKey isEqualToString:existingKey]) {
            keyMissing = NO;
            break;
        }
    }
    if (keyMissing) {
        [dictionary setObject:[NSNull null] forKey:expectedKey];
    }
}

---

不能将nil/null添加到字典中。“如果键或值对象为零，则引发NSInvalidArgumentException。”请尝试将条件if（[self.pop.firstNameTextField.text length]==0）更改为if（[self.pop.firstNameTextField.text length]==0 | |[self.pop.firstNameTextField.text IsequalString:@”（null）]）