OC中的各种遍历

OC中的各种遍历

iOS开发中我们经常遇到各种的数据处理,所以就会经常遇到数组遍历 和 字典遍历。但是不同的遍历方式,效率不同,并且还有不同的限制。

首先把数据源准备好:

_dataSource = [NSMutableArray array];
_dataDic = [NSMutableDictionary dictionary];
for (int i=0; i<5; i++) {
    [_dataSource addObject:@(i)];
    [_dataDic setObject:@(i) forKey:[NSString stringWithFormat:@"我是第%d个Item",i]];
}

for循环遍历

遍历数组

for (int i = 0; i<_dataSource.count; i++) {
    NSLog(@"%@ --- thread:%@",[_dataSource objectAtIndex:i],[NSThread currentThread]);
}

遍历字典

// 取出字典中所有的key (无序的)
NSArray *keys = [_dataDic allKeys];

for (int i = 0; i<keys.count; i++) {
    // 根据key值索引Value即可
    NSString *key = [keys objectAtIndex:i];
    NSString *value = [_dataDic objectForKey:key];
    NSLog(@"%@ --- thread:%@",value,[NSThread currentThread]);
}

这是打印结果

2018-05-09 15:01:23.119707+0800 OCProject[78848:4457173] 0 --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.120003+0800 OCProject[78848:4457173] 1 --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.120262+0800 OCProject[78848:4457173] 2 --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.120473+0800 OCProject[78848:4457173] 3 --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.120754+0800 OCProject[78848:4457173] 4 --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.120951+0800 OCProject[78848:4457173] 我是第3个Item --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.121111+0800 OCProject[78848:4457173] 我是第1个Item --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.121231+0800 OCProject[78848:4457173] 我是第4个Item --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.121377+0800 OCProject[78848:4457173] 我是第2个Item --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}
2018-05-09 15:01:23.121539+0800 OCProject[78848:4457173] 我是第0个Item --- thread:<NSThread: 0x604000263b40>{number = 1, name = main}

【分析】

  • 优点:简单
  • 缺点:遍历字典有太多中间变量,会有一部分开销

for-in遍历

遍历数组

// 遍历数组
for (NSNumber *obj in _dataSource) {
    NSLog(@"%@ --- thread:%@",obj,[NSThread currentThread]);

}

遍历字典

// 遍历字典
NSArray *keys = [_dataDic allKeys];
for (NSString *key in keys) {
    NSString *value = [_dataDic objectForKey:key];
    NSLog(@"%@ --- thread:%@",value,[NSThread currentThread]);

}

打印结果:

2018-05-09 15:17:28.993429+0800 OCProject[79116:4479093] 0 --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.993769+0800 OCProject[79116:4479093] 1 --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.993980+0800 OCProject[79116:4479093] 2 --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.994204+0800 OCProject[79116:4479093] 3 --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.994375+0800 OCProject[79116:4479093] 4 --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.994505+0800 OCProject[79116:4479093] 我是第3个Item --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.994693+0800 OCProject[79116:4479093] 我是第1个Item --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.994861+0800 OCProject[79116:4479093] 我是第4个Item --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.995037+0800 OCProject[79116:4479093] 我是第2个Item --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}
2018-05-09 15:17:28.995253+0800 OCProject[79116:4479093] 我是第0个Item --- thread:<NSThread: 0x60400006c0c0>{number = 1, name = main}

这里需要注意的是的 for-in 遍历时如果对数组进行增删操作会导致程序crash。

【分析】

  • 优点:
    • 语法简洁
    • 效率高
  • 缺点:无法获得当前遍历操作所针对的下标。

枚举器

遍历数组

/*
 * 正向枚举:objectEnumerator
 * 反向枚举:reverseObjectEnumerator
 */
NSEnumerator *enumetorArr = [_dataSource objectEnumerator];
id obj ;
while (obj=[enumetorArr nextObject]) {
    NSLog(@"%@ --- thread:%@",obj,[NSThread currentThread]);
}

遍历字典

NSEnumerator *enumtorValue = [_dataDic objectEnumerator];// Value枚举器 reverseObjectEnumerator反向顺序
NSEnumerator *enumtorKey = [_dataDic keyEnumerator];// key 枚举器
id value;
while (value=[enumtorDic nextObject]) {
    NSLog(@"%@ --- thread:%@",value,[NSThread currentThread]);
}

打印结果:

2018-05-09 15:35:49.961318+0800 OCProject[79558:4515099] 0 --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.961554+0800 OCProject[79558:4515099] 1 --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.961666+0800 OCProject[79558:4515099] 2 --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.961788+0800 OCProject[79558:4515099] 3 --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.961909+0800 OCProject[79558:4515099] 4 --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.962030+0800 OCProject[79558:4515099] 我是第3个Item --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.962130+0800 OCProject[79558:4515099] 我是第1个Item --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.962257+0800 OCProject[79558:4515099] 我是第4个Item --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.962369+0800 OCProject[79558:4515099] 我是第2个Item --- thread:<NSThread: 0x604000065300>{number = 1, name = main}
2018-05-09 15:35:49.962485+0800 OCProject[79558:4515099] 我是第0个Item --- thread:<NSThread: 0x604000065300>{number = 1, name = main}

【分析】

  • 优点:对于不同的数据类型,遍历的语法相似;内部可以简单的通过reverseObjectEnumerator设置进行反向遍历。

  • 缺点:代码量稍大。

快速枚举遍历

遍历数组

// 按照顺序来的
[_dataSource enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    NSLog(@"sort:0 %@ -- %lu --- %@ --- %@",obj,(unsigned long)idx,stop?@"YES":@"NO",[NSThread currentThread]);
}];

// 随机的顺序遍历,开启了多个子线程  NSEnumerationReverse反向遍历,并发遍历 NSEnumerationConcurrent 开启了多个子线程
[_dataSource enumerateObjectsWithOptions:NSEnumerationConcurrent usingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    NSLog(@"sort:1 %@ -- %lu --- %@ --- %@",obj,(unsigned long)idx,stop?@"YES":@"NO",[NSThread currentThread]);
}];

 // 指定循环范围 ,循环次数多可以开辟子线程
[_dataSource enumerateObjectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, _dataSource.count)] options:NSEnumerationConcurrent usingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    NSLog(@"sort:2 %@ -- %lu --- %@ --- %@",obj,(unsigned long)idx,stop?@"YES":@"NO",[NSThread currentThread]);
}];

打印结果:

2018-05-09 18:31:25.808197+0800 OCProject[923:284717] sort:0 0 -- 0 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.808692+0800 OCProject[923:284717] sort:0 1 -- 1 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.808975+0800 OCProject[923:284717] sort:0 2 -- 2 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.809250+0800 OCProject[923:284717] sort:0 3 -- 3 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.809499+0800 OCProject[923:284717] sort:0 4 -- 4 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.809890+0800 OCProject[923:284717] sort:1 0 -- 0 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.810140+0800 OCProject[923:284717] sort:1 1 -- 1 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.810388+0800 OCProject[923:284717] sort:1 2 -- 2 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.810635+0800 OCProject[923:284717] sort:1 3 -- 3 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.810883+0800 OCProject[923:284717] sort:1 4 -- 4 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.813959+0800 OCProject[923:284717] sort:2 0 -- 0 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.814289+0800 OCProject[923:284717] sort:2 1 -- 1 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.814552+0800 OCProject[923:284717] sort:2 2 -- 2 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.814806+0800 OCProject[923:284717] sort:2 3 -- 3 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}
2018-05-09 18:31:25.815054+0800 OCProject[923:284717] sort:2 4 -- 4 --- YES --- <NSThread: 0x137e0bb50>{number = 1, name = main}

当我把数组内的元素个数增加到 10,请看前缀是sort:1 的打印结果如下:

2018-05-09 18:34:41.806499+0800 OCProject[928:286028] sort:1 0 -- 0 --- YES --- <NSThread: 0x145e0bb50>{number = 1, name = main}
2018-05-09 18:34:41.806982+0800 OCProject[928:286068] sort:1 1 -- 1 --- YES --- <NSThread: 0x145eb08d0>{number = 3, name = (null)}
2018-05-09 18:34:41.809488+0800 OCProject[928:286068] sort:1 3 -- 3 --- YES --- <NSThread: 0x145eb08d0>{number = 3, name = (null)}
2018-05-09 18:34:41.809518+0800 OCProject[928:286028] sort:1 2 -- 2 --- YES --- <NSThread: 0x145e0bb50>{number = 1, name = main}
2018-05-09 18:34:41.809788+0800 OCProject[928:286068] sort:1 4 -- 4 --- YES --- <NSThread: 0x145eb08d0>{number = 3, name = (null)}
2018-05-09 18:34:41.809840+0800 OCProject[928:286028] sort:1 5 -- 5 --- YES --- <NSThread: 0x145e0bb50>{number = 1, name = main}
2018-05-09 18:34:41.810045+0800 OCProject[928:286068] sort:1 6 -- 6 --- YES --- <NSThread: 0x145eb08d0>{number = 3, name = (null)}
2018-05-09 18:34:41.810462+0800 OCProject[928:286028] sort:1 7 -- 7 --- YES --- <NSThread: 0x145e0bb50>{number = 1, name = main}
2018-05-09 18:34:41.810989+0800 OCProject[928:286068] sort:1 8 -- 8 --- YES --- <NSThread: 0x145eb08d0>{number = 3, name = (null)}
2018-05-09 18:34:41.811034+0800 OCProject[928:286028] sort:1 9 -- 9 --- YES --- <NSThread: 0x145e0bb50>{number = 1, name = main}

遍历字典

// 主线程 无序
[_dataDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
    NSLog(@"key:%@ -- value:%@  --- %@",key,obj,[NSThread currentThread]);
}];
    
// 无序; NSEnumerationReverse反向遍历,并发遍历 NSEnumerationConcurrent

[_dataDic enumerateKeysAndObjectsWithOptions:NSEnumerationReverse usingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
    NSLog(@"key:%@ -- value:%@  --- %@",key,obj,[NSThread currentThread]);
}];

打印结果:

2018-05-09 18:33:48.223268+0800 OCProject[926:285509] key:3 -- value:我是第3个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.224066+0800 OCProject[926:285509] key:1 -- value:我是第1个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.225122+0800 OCProject[926:285509] key:4 -- value:我是第4个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.226368+0800 OCProject[926:285509] key:2 -- value:我是第2个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.226915+0800 OCProject[926:285509] key:0 -- value:我是第0个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.227419+0800 OCProject[926:285509] key:3 -- value:我是第3个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.228593+0800 OCProject[926:285509] key:1 -- value:我是第1个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.229978+0800 OCProject[926:285509] key:4 -- value:我是第4个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.231440+0800 OCProject[926:285509] key:2 -- value:我是第2个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}
2018-05-09 18:33:48.231977+0800 OCProject[926:285509] key:0 -- value:我是第0个Item  --- <NSThread: 0x107e0b250>{number = 1, name = main}

【分析】

  • 优点:
    • 遍历时可以直接从block中获得需要的所有信息,包括下标、值等。特别相对于字典而言,不需要做多余的编码即可同时获得key和value的值。
    • 能够直接修改block中key或者obj的类型为真实类型,可以省去类型转换的工作。
    • 可以通过NSEnumerationConcurrent枚举值开启并发迭代功能。
  • 缺点:暂无

说明:基于Block的遍历方式在实现反向遍历的时候也非常简单,使用enumerateObjectsWithOptions方法,传递NSEnumerationReverse作为参数即可,在处理遍历操作的时候推荐基于Block的遍历方式。

迭代

遍历数组

dispatch_queue_t queue =dispatch_queue_create("apply并行队列", DISPATCH_QUEUE_CONCURRENT);
dispatch_apply(_dataSource.count, queue, ^(size_t index) {
    NSLog(@"%@----%@",self->_dataSource[index],[NSThread currentThread]);
});
NSLog(@"end1");

遍历字典

NSArray *allkeys = [_dataDic allKeys];
NSArray *allValue = [_dataDic allValues];
dispatch_apply(_dataDic.count, queue, ^(size_t index) {
    NSString *key = [allkeys objectAtIndex:index];
    NSLog(@"dic: %@----%@",[self->_dataDic objectForKey:key],[NSThread currentThread]);
});

打印结果:

2018-05-09 19:24:03.875390+0800 OCProject[975:301673] 0----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.875913+0800 OCProject[975:301673] 2----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.876194+0800 OCProject[975:301673] 3----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.876445+0800 OCProject[975:301673] 4----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.876688+0800 OCProject[975:301673] 5----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.876926+0800 OCProject[975:301673] 6----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.877162+0800 OCProject[975:301673] 7----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.877398+0800 OCProject[975:301673] 8----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.877669+0800 OCProject[975:301673] 9----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.878021+0800 OCProject[975:301852] 1----<NSThread: 0x1231b4750>{number = 3, name = (null)}
2018-05-09 19:24:03.878310+0800 OCProject[975:301673] end1
2018-05-09 19:24:03.878752+0800 OCProject[975:301673] dic: 我是第7个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.879072+0800 OCProject[975:301673] dic: 我是第3个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.879372+0800 OCProject[975:301673] dic: 我是第8个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.879672+0800 OCProject[975:301673] dic: 我是第4个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.879971+0800 OCProject[975:301673] dic: 我是第0个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.880271+0800 OCProject[975:301673] dic: 我是第9个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.880568+0800 OCProject[975:301673] dic: 我是第5个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.883701+0800 OCProject[975:301673] dic: 我是第6个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.883947+0800 OCProject[975:301673] dic: 我是第2个Item----<NSThread: 0x121e0ba50>{number = 1, name = main}
2018-05-09 19:24:03.880890+0800 OCProject[975:301852] dic: 我是第1个Item----<NSThread: 0x1231b4750>{number = 3, name = (null)}

【分析】

  • 优点:开启多条线程并发处理遍历任务,执行效率高。
  • 缺点:
    • 对于字典和集合的处理需借助数组
    • 无法实现反向遍历。
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