Change a value within a NSMutableArray

问题

I have a NSMutableArray that is loaded with values.

Later in the application, I need to change the values of one of the elements in the array.

How do I accomplish this?

thanks tony

回答1:

Take a look at the class reference instance methods:

http://developer.apple.com/library/ios/#documentation/cocoa/reference/foundation/Classes/NSMutableArray_Class/Reference/Reference.html

You can use:

replaceObjectAtIndex:withObject: given you know the index of the object. replaceObjectsAtIndexes:withObjects: to replace multiple objects at once.

回答2:

Call -[NSMutableArray replaceObjectAtIndex:withObject:]. Or, if the object in the array is mutable, just grab it with -objectAtIndex: and modify its properties directly.

回答3:

You would probably want to use 'replaceObjectAtIndex:withObject:' for replacing the object itself.

回答4:

refer following link. It may help you

http://developer.apple.com/library/ios/#documentation/cocoa/reference/foundation/Classes/NSMutableArray_Class/Reference/Reference.html#//apple_ref/occ/instm/NSMutableArray/replaceObjectAtIndex:withObject:

From that you can use replaceObjectAtIndex:withObject: or
replaceObjectsAtIndexes:withObjects: for replacing objects.

just you have to know the index of objects.

来源：https://stackoverflow.com/questions/4218256/change-a-value-within-a-nsmutablearray