IOS ARC NSMutableArray do I need to removeAllObjects before alloc new memory for it

问题:

NSMutableArray * arrayTest;  -(void) setContent {   //must I call [array removeAllObjects]; ?    arrayTest = [[NSMutableArray alloc] init]    [arrayTest addObject:@"str"];   ...//add many objects }

I call this function at different code snippet. do I need to removeAllObjects of arrayTest before , then alloc memory for arrayTest every time ? I use ARC . I don't want my app memory to increase every time I call this function.

回答1:

No, what you have is fine. You don't need to call removeAllObjects under ARC or non-ARC.

When the old array is deallocated, it will take care of releasing all of the objects in the old array.

回答2:

Check if arrayTest exists before alloc'ing memory. If you don't you'll have a new array every time the method is called (assuming you want to keep the array and it's content around for a while). Or even better.. move the alloc into the init of the class.

-(void) setContent {   if(!arrayTest){       arrayTest = [[NSMutableArray alloc] init];   }    [arrayTest addObject:@"str"];   ...//add many objects }

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