How to updates array values in iphone app

I have to updates array values at position 2 and 4. 开发者_StackOverflow中文版How will I update array values. I am initializing my array like below.

ArrayrData=[[NSArray alloc]initWithArray:statuses]; // where statuses is also an array

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You can't change the value of NSArray. So initialize your array as Mutable Array

NSMutableArray *ArrayrData=[[NSMutableArray alloc]init];
[ArrayrData addObjectsFromArray:statuses];

You can update the value in a NSMutableArray using,

– replaceObjectAtIndex:withObject:
– replaceObjectsAtIndexes:withObjects:
– replaceObjectsInRange:withObjectsFromArray:range:
– replaceObjectsInRange:withObjectsFromArray:

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Use the method

- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject;

if u want to replace them with new objects or simply access the objects at index 2 and 4 and then modify them using

[ArrayrData objectAtIndex:idx]; //idx is the index of the object you want to access, in ur case it is 2 or 4.

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You can change the NSMutableArray dynamically in the application as follows:

NSMutableArray *ArrayData = [[NSMutableArray alloc]init];
[ArrayData addObjectsFromArray:statuses];

And now whenever you want to replace any object in array then you can simply replace using the "replaceObjectAtIndex" method as follows:

[ArrayData replaceObjectAtIndex:2 withObject:@"your Object or data"];
[ArrayData replaceObjectAtIndex:4 withObject:@"your Object or data"];

Let me know if you have any questions.