在数组对象中查找数组对象的索引

Question

举个例子,如果我有这个数组:

_mode = [NSArray arrayWithObjects:
                      [NSArray arrayWithObjects:@"1", @"One", nil],
                      [NSArray arrayWithObjects:@"2", @"Two", nil],
                      [NSArray arrayWithObjects:@"3", @"Three", nil],
                      [NSArray arrayWithObjects:@"4", @"Four", nil],
                      [NSArray arrayWithObjects:@"5", @"Five", nil],
                      nil];

我需要找到数组_mode的哪个对象包含@"3"我该怎么做？我尝试过selectedIndex = [_mode indexOfObject:@"3"];,selectedIndex = [[_mode objectAtIndex:0] indexOfObject:@"sta"];但都没有工作.

Answer 1

[_mode indexOfObjectPassingTest:^(id obj, NSUInteger idx, BOOL *stop){
    return [[obj objectAtIndex:0] isEqualToString:@"3"];
}];