NSMutableArray中的objectForIndex

Question

I have used 1 to 10 number stored in array as:

number = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil];

And used arc4random in this array as:

randomNumber = arc4random() % number.count; //random selected number

NSLog(@"%d",randomNumber);

In classname.h file

 int randomNumber;
  NSMutableArray *number;

How to do objectforindex in this array

Answer 1

[arrayName indexOfObject:myObject]

检查此链接文档

Answer 2

In your case you can simple try:

[number indexOfObject:@(randomNumber + 1).stringValue]; //randomNumber + 1 -- because randomNumber is in [0;9] and your strings are in [1;10]

For more complicated cases (if you aren't store numbers in strings) then you can use:

[arr indexOfObjectPassingTest:^BOOL(NSString * obj, NSUInteger idx, BOOL * _Nonnull stop) {
    if ([obj isEqualToString:@"2"]) {
        *stop = YES;
        return YES;
    }
    return NO;
}];