How to compare text from two labels in objective c - ios

Question

I make a string split on two labels. label1 contain firstPart of string and label2 contain secondPart of string. Now i want to compare the text from two labels to make full string and show an alert of success when press on a button.See in this image blue label and gray label make full string "window" words labels
Here is my logic i perform in button press action but it always gives alert of try again,can any one please tell me where is my mistake in code.
get the text from file and store in an array and set label text.
label1.text = [arr1 objectAtIndex:i]; and [label2.text = arr2 objectAtIndex:i];
in button press method
- (IBAction)btnClicked:(id)sender
{
NSMutableArray *checkarry=[[NSMutableArray alloc]init];
for(int i=0;i<arr2.count;i++){
NSString *str=[NSString stringWithFormat:#"%#%#",[arr1 objectAtIndex:i],[arr2 objectAtIndex:i]];
[checkarry addObject:str];
}
NSSet *set1 = [NSSet setWithArray:arrayOfStringBeforeSpiliting];
NSSet *set2 = [NSSet setWithArray:checkarry];
if([set1 isEqualToSet:set2]){
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:#"Success" message:#"Congarats" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}
else{
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:#"Error" message:#"Try Again" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
}