Get NSRange from NSArray

Question

So I have NSArray that contains objects like {117, 22}{http://t.co/7l3oiMDQt3} and I want to get 117 and 22 I tried to use ObjectAtIndex: and the app was crashed and then added this:

if(array.count > 0) {                                           
   NSLog(@"%@",[array objectAtIndex:1]);
}

and still the app crashes.

is there's any other way to get the NSRange location and length from the array?

EDIT:

The objects inside the array is NSDataDetector that gets the links form a string.

it says this when it crashes:

 *** Terminating app due to uncaught exception 'NSRangeException', reason: '*[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
***

so what...? what's an "object like {117, 4}{said}`"? Did you use a debugger to investigate the reasons your app crashed? — The Paramagnetic Croissant, Aug 23 '14 at 00:06
`objectAtIndex:` does not often crash without a reason. Are you sure your array contains two objects? — The Paramagnetic Croissant, Aug 23 '14 at 00:14
When you say, descriptively "the app crashes", what **exactly** does it tell you is the reason for termination? We're not mind readers. — Tommy, Aug 23 '14 at 00:18
@Tommy sorry about that I added what it says when it crashes — Jon Kayin, Aug 23 '14 at 00:29
@JonKayin well that's it. Your array contains 1 element, at index 0. You are trying to access the **second** element, at index 1. That's incorrect. (Also, you should have pasted the error message [which is informative and kind of obvious...] into Google **days before** falling back to asking here. Stack Overflow is full of solutions to this very same problem. Don't be lazy.) — The Paramagnetic Croissant, Aug 23 '14 at 00:30
possible duplicate of [NSArray out of bounds check](http://stackoverflow.com/questions/9715261/nsarray-out-of-bounds-check) — The Paramagnetic Croissant, Aug 23 '14 at 00:32
@TheParamagneticCroissant the possible duplicate is not solving my problem. — Jon Kayin, Aug 23 '14 at 00:37
As others have stated, the crash is because even with the bounds check, you are accessing an array element that is out of bounds. objectAtIndex:0 would be correct for the bounds check you have implemented. — quellish, Aug 23 '14 at 00:54
have you checked your data carefully. I think it isn't NSArray type — Huy Nghia, Sep 01 '14 at 00:30

score 1 · Answer 1 · answered Aug 23 '14 at 00:21

1

Your check can still be out of the array range :

if(matc.count > 0) {
NSLog(@"%@",[array objectAtIndex:0]); //not 1 }

answered Aug 23 '14 at 00:21

Zigglzworth

6,645
9
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107

nothing happens, the same result as there's no `objectAtIndex` – Jon Kayin Aug 23 '14 at 00:26
Wait.. What is matc? Shouldn't that be array? – Zigglzworth Aug 23 '14 at 00:29

score 0 · Answer 2 · answered Aug 23 '14 at 00:26

You should never arbitrarily check an index in an array without knowing the exact length. Whenever you're dealing with an array with a varying length, you should do something like this to prevent trying to access an index that doesn't exist:

for (NSInteger index = 0; index < array.count; index++) {
    NSLog(@"%@", array[index]);
}

You'll never have an out of bounds exception doing the above.

Get NSRange from NSArray

2 Answers2