Hello,
I have code that's part of a framework and I'd like to port it to iOS. I tried
isolating the code like so:
//
// RootViewController.m
// iPhoneTest
#import "RootViewController.h"
@implementation RootViewController
#pragma mark -
#pragma mark View lifecycle
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
- (NSUInteger)systemPageSize
{
static NSUInteger __sSystemPageSize = NSNotFound;
#if TARGET_OS_MAC
if (NSNotFound == __sSystemPageSize) {
NSTask *task = [[NSTask alloc] init];
// <do something here...>
[task release];
}
#elif TARGET_OS_IPHONE
// <do something here...>
#endif
return __sSystemPageSize;
}
When I compile the standard iPhone boilerplate app from Xcode I get the
following error:
> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m: In function
> '-[RootViewController systemPageSize]':
> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error:
> 'NSTask' undeclared (first use in this function)
> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error:
> (Each undeclared identifier is reported only once
> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error: for
> each function it appears in.)
> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error:
> 'task' undeclared (first use in this function)
> {standard input}:59:non-relocatable subtraction expression,
> "L_OBJC_SELECTOR_REFERENCES_0" minus "L00000000001$pb"
> {standard input}:59:symbol: "L_OBJC_SELECTOR_REFERENCES_0" can't be undefined
> in a subtraction expression
> {standard input}:54:non-relocatable subtraction expression,
> "L_OBJC_CLASSLIST_SUP_REFS_$_0" minus "L00000000001$pb"
> {standard input}:54:symbol: "L_OBJC_CLASSLIST_SUP_REFS_$_0" can't be
> undefined in a subtraction expression
> {standard input}:unknown:Undefined local symbol L_OBJC_CLASSLIST_SUP_REFS_$_0
> {standard input}:unknown:Undefined local symbol L_OBJC_SELECTOR_REFERENCES_0
I know NSTask doesn't exist on iOS, so I was hoping to implement the method
that would work for both Mac and iOS by specifying TARGET_OS_MAC and
TARGET_OS_IPHONE. What am I missing?
Thanks,
-- Tito
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