遍历数组

NSMutableArray *mArray = [NSMutableArray arrayWithObjects:@"a",@"b",@"abc",nil];
    
    NSMutableArray *mArrayCount = [NSMutableArray arrayWithCapacity:1];
    
    [mArray enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock: ^(id obj,NSUInteger idx, BOOL *stop){
        
        [mArrayCount addObject:[NSNumber numberWithInt:[obj length]]];
        NSLog(@"%@,%d",obj,idx);
    }];