objective-c遍历

//第一种遍历：普通for循环    long int count = [array count];    for (int i = 0 ; i < count; i++) {        NSLog(@"1遍历array: %zi-->%@",i,[array objectAtIndex:i]);    }    //第二种遍历：快速for循环,需要有外变量i    int i = 0;    for (id obj in array) {        NSLog(@"2遍历array：%zi-->%@",i,[array objectAtIndex:i]);        i++;    }    //第三种遍历：OC自带方法enumerateObjectsUsingBlock:    //默认为正序遍历    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        NSLog(@"3遍历array：%zi-->%@",idx,obj);    }];    //NSEnumerationReverse参数为倒序遍历    [array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        NSLog(@"4倒序遍历array：%zi-->%@",idx,obj);    }];    //第四种遍历：利用枚举    NSEnumerator *en = [array objectEnumerator];    id obj;    int j = 0 ;    while (obj = [en nextObject]) {        NSLog(@"5遍历array：%d-->%@",j,obj);        j++;    }