Question

First of all, I already able to restore PPC support in Xcode 4 Snow Leopard using this article How do I add PPC/PPC64 support back to Xcode 4.2 under Lion?. But after sometimes, I realize that to make my current application (10.6, Snow Leopard) compatible with Tiger, I must modify some code. Especially about the synthesize & implement keyword. How do you deal with it? I enter Mac OS X programming by using X code 4, not using the previous version of it

And because @property is not supported in 10.4, is the IB Designer in Xcode 4 can still work if I am trying to make it compatible with Tiger?

Or, is it really that I must code using Xcode3 this way?
* O o…

Thanks,
Eko

Answer 1

In objective-C the @property and @synthesize are neat shortcuts to implementing a getter/setter for a specific variable

Unfortunately you will need to stop using these.

You will need something like this

Example.h

@interface Example : NSObject
{
    NSObject * coolData;
}
@end

Example.m

@implementation Example
-(void)setCoolData:(NSObject*)newCD
{
    [newCD retain];
    [coolData release];
    coolDate = newCD;
}
-(NSObject*)coolData
{
    return coolData;
}
-(void)dealloc
{
    [coolData release];
    [super dealloc];
}
@end

And you will need to replace the code where you were accessing and setting the variables in question.

You don’t need to do the release,retain methods for int’s, float’s … (any primitive data that is not a pointer to an object)

For clarification

//assume number is defined in the header file     int number;

-(void)setNumber:(int)n
{
    number = n;
}
-(int)number
{
    return number;
}