NSMutable array, do not retain the added object

I have a UITextField called txtvwEmail. i am adding the text from txtvwEmail.text to the Array pastUrls but after adding the next text it remove the first text. Im using the code

if (![pastUrls containsObject:txtvwEmail.text]) {开发者_如何学编程
    [pastUrls addObject:txtvwEmail.text];
}

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You should rely on the basics of the language and frameworks. The array DOES RETAIN the object, however, it could be:

1. pastUrls is nil -> no retain
2. somewhere in the code .text is released (or autoreleased) and the count is yet the same

Also, you can't really be sure [obj retainCount] return the correct value. To diagnose the real problem, revise the code or post it here so we can help.

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//this should be outside of ur all loops
NSMutableArray *pastUrls=[[NSMutableArray alloc]init];

//remove this line
//NSMutableArray *pastUrls=[NSMutableArray array];

if (![pastUrls containsObject:txtvwEmail.text]) {
    [pastUrls addObject:txtvwEmail.text];
}

NSLog(@"pastUrls : %@ \n\n",pastUrls);