Question

I’m little confuse because in some tutorials is just

in h

@property (readwrite,nonatomic) NSUInteger DirectProp;

in m

@synthesize DirectProp;

But in other is like this

in h

@interface MyClass : CCNode {
    NSUInteger throuVarProp;

}
@property (readwrite,nonatomic) NSUInteger ThrouVarProp;

in m

@synthesize ThrouVarProp = throuVarProp;

Which way is the right way?

Answer 1

With a single argument:

@synthesize directProp;

The synthesized getter/setter methods are called the same as the instance variable used to store the value. This can get confusing. For example:

self.directProp = YES;

[self setDirectProp:YES];

directProp = YES;

Are all valid.

With the additional = ivar, you are able to name the instance variable (the convention being to use a leading underscore), which is a good idea, so you don’t get confused:

@synthesize directProp = _directProp;


self.directProp = YES;

[self setDirectProp:YES];

_directProp = YES;

As also mentioned, with newer runtimes you don’t need to declare the instance variable before use, which is also a bad idea and seems to be there to promote laziness. You will regret using this feature some day…