//这一句写不写都可以，写的话一个警告，如果下面语句报错，就写上这一句

//    struct label *jumpTo;

    for (int i=0; i<10; i++) {

        NSLog(@"0000====%d",i);

        if (i==5) {

            gotojumpTo;

        }

        NSLog(@"1111====%d",i);

    jumpTo:NSLog(@"跳到这一行");

    }

运行结果

2014-12-17 17:46:43.465 Mustdemo[1335:613765] 0000====0

2014-12-17 17:46:43.466 Mustdemo[1335:613765] 1111====0

2014-12-17 17:46:43.466 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.466 Mustdemo[1335:613765] 0000====1

2014-12-17 17:46:43.466 Mustdemo[1335:613765] 1111====1

2014-12-17 17:46:43.466 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.466 Mustdemo[1335:613765] 0000====2

2014-12-17 17:46:43.466 Mustdemo[1335:613765] 1111====2

2014-12-17 17:46:43.466 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.467 Mustdemo[1335:613765] 0000====3

2014-12-17 17:46:43.467 Mustdemo[1335:613765] 1111====3

2014-12-17 17:46:43.467 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.467 Mustdemo[1335:613765] 0000====4

2014-12-17 17:46:43.467 Mustdemo[1335:613765] 1111====4

2014-12-17 17:46:43.467 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.468 Mustdemo[1335:613765] 0000====5

2014-12-17 17:46:43.469 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.469 Mustdemo[1335:613765] 0000====6

2014-12-17 17:46:43.469 Mustdemo[1335:613765] 1111====6

2014-12-17 17:46:43.470 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.471 Mustdemo[1335:613765] 0000====7

2014-12-17 17:46:43.472 Mustdemo[1335:613765] 1111====7

2014-12-17 17:46:43.472 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.472 Mustdemo[1335:613765] 0000====8

2014-12-17 17:46:43.472 Mustdemo[1335:613765] 1111====8

2014-12-17 17:46:43.472 Mustdemo[1335:613765]跳到这一行

2014-12-17 17:46:43.472 Mustdemo[1335:613765] 0000====9

2014-12-17 17:46:43.473 Mustdemo[1335:613765] 1111====9

2014-12-17 17:46:43.473 Mustdemo[1335:613765]跳到这一行

oc goto语法