iOS 数组快速遍历的方法

NSMutableArray * array = [NSMutableArray array];
    
    for (int i = 0; i < 5; i ++) {
        [array addObject:[NSString stringWithFormat:@"%d",i]];
    }
    
    dispatch_queue_t queue =dispatch_queue_create("apply并行队列", DISPATCH_QUEUE_CONCURRENT);
    dispatch_apply(array.count, queue, ^(size_t index) {
        NSLog(@"%@----%@",array[index],[NSThread currentThread]);
    });
    NSLog(@"end - %@",[NSThread currentThread]);

输出结果:

2017-07-18 14:04:09.494 TextDemo[21410:374449] 4----<NSThread: 0x608000070000>{number = 6, name = (null)}
2017-07-18 14:04:09.494 TextDemo[21410:374450] 2----<NSThread: 0x600000069480>{number = 3, name = (null)}
2017-07-18 14:04:09.494 TextDemo[21410:374466] 3----<NSThread: 0x60000006bc80>{number = 5, name = (null)}
2017-07-18 14:04:09.494 TextDemo[21410:374401] 0----<NSThread: 0x610000069040>{number = 1, name = main}
2017-07-18 14:04:09.494 TextDemo[21410:374465] 1----<NSThread: 0x61800007b9c0>{number = 4, name = (null)}
2017-07-18 14:04:09.494 TextDemo[21410:374401] end - <NSThread: 0x610000069040>{number = 1, name = main}