how to use valueforkey as if statement parameter
<Rows>
<Row ID="76" MANUFACTURER="DIB" ISTENT="F"/>
<Row ID="38" MANUFACTURER="HIB" ISTENT="T"/>
<Rows>

if ([arrayData valueForKey:@"ISTENT"] == @"T") {

    then pass my values over to custom method here.

}

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like %@",@"ISTENT",@"T"];
NSArray *filteredArray = [arrayData filteredArrayUsingPredicate:predicate];

if ([[arrayData valueForKey:@"ISTENT"] isEqualToString:@"T"]) {
 //code here
}

[[arrayData valueForKey:@"ISTENT"] isEqualToString:@"T"];