什么是objective-c中的php array()等价物

Posted 2023-03-04

【中文标题】什么是objective-c中的php array()等价物

【英文标题】：What is the equivalent of php array() in objective-c

【发布时间】：2011-05-31 10:35:45

【问题描述】：

我该怎么做：

php：

$arr1 = array( 'a', 1, 'b', 5, 'z' );
$arr2 = array( 'key1' => 'value1', 'key2' => 'value2' );
$arr3 = array( 'key1' => 'value1', 'value2', 'value3' );

还有这个：

foreach ($arr1 as $value) 
    echo "Value: $value<br />\n";

foreach ($arr2 as $key => $value) 
    echo "Key: $key; Value: $value<br />\n";

在 Objective-C 中？

---

谢谢

【参考方案1】：

$arr1 --- > NSArray 或NSMutabelArray

$arr2 --- > NSDictionary 或 NSMutabelDictionary.

查看从 NSDirectiory 访问值。

NSDirectiory* arr2;
for (NSString* myKey in arr2)

    id value = [arr2 objectForKey:myKey];

查看从 NSMutableArray 访问值。

NSMutableArray * arr1;
for (id* object in arr1) 
  //id hold the value of your object stored in array.

【讨论】：

和 $arr3 和 foreach(...)... ?

***.com/questions/2143372/…

【参考方案2】：

对于数组

  NSMutableArray *arr1 = [NSMutableArray arrayWithObjects:@"1", @"2", @"a", @"b", nil];
    for (NSString *obj in arr1) 
        // do stuff
    

对于地图

  NSMutableArray *keys = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", nil];
    NSMutableArray *values = [NSMutableArray arrayWithObjects:@"a", @"b", @"c", @"d", nil];
    NSDictionary *dict = [NSDictionary dictionaryWithObjects:keys forKeys:values];
    for (id key in dict) 
        id value = [dict valueForKey:key];
        // do stuff with value