NSInteger value not valid when passing in a variable, for custom table view class delegate method

Question

I'm testing a custom table view style class:

HorizontalTable

It produces a horizontal table view.

One of the delegate methods equivalent to tableView:numberOfRowsInSection: is:

- (NSInteger)numberOfColumnsForTableView:(HorizontalTableView *)tableView. 

If I give this a number (ex: return 10;) it is happy and it give me the number "cells" that I want. But if I feed it a value of someArray.count or an int or NSInteger variable, the table view just comes out blank, delivering no cells.

I think that the method in the custom table view class that receives the NSInteger value is this:

- (NSUInteger)numberOfPages {
    NSInteger numPages = 0;
    if (_delegate)
        numPages = [_delegate numberOfColumnsForTableView:self];
    return numPages;
}

Do I need to cast the result of someArray.count to an NSInteger?

Answer 1

In fact converting the value to be returned to the count of an NSArray, as opposed to the count an NSMutableArray fixes the issue. Why? I am not sure why an NSArray's count value is valid but not the NSMutableArray's. Anyone?

Answer 2

Here you get the value from array means your array not nil so just debug and check the if condition that its come in that condition or not and what you get from NSLog

- (NSUInteger)numberOfPages {
    NSInteger numPages = 0;
    if (_delegate){
        numPages = [_delegate numberOfColumnsForTableView:self];
        NSLog(@"Total record %d",numPages);//what you get here?
    }
    return numPages;
}

Answer 3

numPages = [_delegate numberOfColumnsForTableView:self];
//self requires an object of type  HorizontalTableView

Answer 4

NSMutableArray is editable, where as NSArray is read-only.

NSMutableArray is a subclass of NSArray and responds to messages such as addObject, removeObject and so forth; i.e. it is mutable, like the name says. Instead, NSArray is immutable, i.e. you can't add/remove objects.