objective c - simple NSMutable array question -

umm simple question here:

i have instance of nsmutablearray declared in header

nsmutablearray *day19;  @property (nonatomic, retain) nsmutablearray *day19 

implementation:

@synthesize day19; 

in viewdidload

self.day19 = [[nsmutablearray alloc] init]; 

in mymethod want add objects array i:

nsobject *newobject = [[nsobject alloc] init];  [day19 addobject:newobject]; 

however... when check day19 array there nothing in it. if conversely add newobject temparray within mymethod scope , set day19 array temparray, day19 has objects.

super basic know must confused morning or something...

thanks help

in viewdidload

self.day19 = [[nsmutablearray alloc] init]; 

in mymethod want add objects array i:

nsobject *newobject = [[nsobject alloc] init];  [day19 addobject:newobject]; 

however... when check day19 array there nothing in it. if conversely add newobject temparray within mymethod scope , set day19 array temparray, day19 has objects.

let me guess: checked array code this:

nslog(@"day19 contains %lu objects", [day19 count]); 

remember message nil nothing , returns nil, 0, or 0.0. that's why output said 0 objects: don't have array in first place. probable reason viewdidload hasn't been called yet, have not yet created mutable array.

it's possible have array (i.e., view has been loaded) @ time examine array, didn't have array yet (the view hadn't been loaded yet) @ time tried add array, addobject: message fell on deaf ears.

consider creating array earlier. should creating in init or initwithcoder:.

a third possibility examined array before ever added it. make sure log or break @ both points, know 1 happened first.

whatever problem is, need either assign array instance variable, not property, or autorelease array before assigning property. otherwise, you're over-retaining array, means leak later on. need review memory management programming guide cocoa.