Re: Variable Number of Parameters in Method
Re: Variable Number of Parameters in Method
- Subject: Re: Variable Number of Parameters in Method
- From: Dave <email@hidden>
- Date: Thu, 22 Aug 2013 07:37:11 +0100
Hi,
It's not much good to me since I don't have a problem passing objects but with passing a mixed set.
Type passing, 1,2,3,5.6,@"hello",nil to the arrayWithObjects and you will see what I mean
Cheers
Dave
On 21 Aug 2013, at 20:04, Alex Zavatone <email@hidden> wrote:
> Just in case the styled text is stripped, here is the line I'm referring to from the header file:
>
> + (id)arrayWithObjects:(id)firstObj, ... NS_REQUIRES_NIL_TERMINATION;
>
> Sent from my iPad
>
> On Aug 21, 2013, at 2:58 PM, Alex Zavatone <email@hidden> wrote:
>
>> The approach I mentioned is what NSArray uses to allow an arbitrary amount of objects in this call to init it. Supplying nil tells the runtime that there are no more parameters.
>>
>> NSArray *myArray;
>> myArray = [NSArray alloc] initWithObjects: @"my String", @"another", @"more", nil];
>>
>> It's the nil termination of the parameters approach.
>>
>> How you do this is that bold line that I outlined earlier.
>>
>> Sent from my iPad
>>
>> On Aug 21, 2013, at 1:17 PM, "Stephen J. Butler" <email@hidden> wrote:
>>
>>> On Wed, Aug 21, 2013 at 4:22 AM, Dave <email@hidden> wrote:
>>>
>>>> if ([myType isEqualToString:@"NSInteger"] )
>>>> {
>>>> myNSInteger = va_arg(myArgumentList,NSInteger*);
>>>> // do something with myNSInteger
>>>> [myFormattedString appendFormat:@"myNSInteger = %d ",
>>>> myNSInteger];
>>>> }
>>>>
>>>> else if ([myType isEqualToString:@"CGFloat"] )
>>>> {
>>>> myCGFloat = va_arg(myArgumentList, CGFloat*);
>>>> // do something with myCGFloat
>>>> [myFormattedString appendFormat:@"myCGFloat = %f ",
>>>> myCGFloat];
>>>> }
>>>
>>>
>>> This is better, however... if you pass an actual NSInteger or CGFloat to
>>> the method, va_arg() should have a type of NSInteger or CGFloat, not
>>> pointers to those types. Your code examples with it's printf style formats
>>> is using the former, not the latter. Just to be clear, you can have all
>>> these cases:
>>>
>>> if ([myType isEqualToString:@"NSInteger"] ) {
>>> myNSInteger = va_arg(myArgumentList,NSInteger);
>>> } else if ([myType isEqualToString:@"NSInteger*"] ) {
>>> pMyNSInteger = va_arg(myArgumentList,NSInteger*);
>>> } else if ([myType isEqualToString:@"CGFloat"]) {
>>> myCGFloat = va_arg(myArgumentList, CGFloat);
>>> } else if ([myType isEqualToString:@"CGFloat*"]) {
>>> pMyCGFloat = va_arg(myArgumentList, CGFloat*);
>>> } ... etc
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