create a method that sets textlabel.text to nsarray at index(x) while x<nsarray.count objective c

Question

I have created an NSArray from a text file with

void arrayfromfile {

// get a reference to our file
NSString *myPath = [[NSBundle mainBundle]pathForResource:@"CalendarQuotes" ofType:@"txt"];

// read the contents into a string
NSString *myFile = [[NSString alloc]initWithContentsOfFile:myPath encoding:NSUTF8StringEncoding error:nil];

// split our string into an array
NSArray *mySplit = [myFile componentsSeparatedByString:@"\n"];}

Now what I'd like to do is set label.text to mySplit[x] while x< mysplit.count and call it every time a user swipes up.

setlabeltextmethod quote {
if x<mySplit.count {
label.text = mySplit objectatindex x
x+=1
else { label.text = @"thats it folks" }
} 

What I'm having trouble with is accessing mySplit from the quote so I can manipulate it to give me the quote at index x.

When I tried to access it from my swipe method:

- (IBAction)swipeUp:(id)sender {

[self doAnimationUp];
NSLog (@"swipedUp");
NSLog(@"array%@" , [mySplit objectAtIndex:0]);
NSLog(@"arraycreated");
//I'm using NSLog for debug purposes but this is where I would setlabeltext.text to mySplit objectAtIndex
}

I get array[null] .

Answer 1

Your mySplit variable is local to arrayfromfile , so once that method returns the variable has gone. There is more than one approach to solving this. One is making it an instance variable, that is a variable that belongs to your current class instance and is visible to every instance method. Start you implementation like this:

@implementation MyClassName
{
    NSArray *mySplit;
}

Now set the variable in the instance method arrayfromfile and read it in the instance method swipeUp - both calls must be made in the same instance of your class, each instance has its own set of instance variables.

Other options include adding a property to the class or, if you must, a global variable of some kind.

HTH