IOS开发之旅IOS常用数据结构NSArrayNSMutableArrayNSDictionaryNSMutableDi.docx

1、IOS开发之旅IOS常用数据结构NSArrayNSMutableArrayNSDictionaryNSMutableDiIOS开发之旅-IOS常用数据结构NSArray、NSMutableArray、NSDictionary、NSMutableDi NSArray NSArray基本用法void arrayTest1() /数组初始化最后必须以nil结尾，表示数组元素结束 NSArray *array1 = NSArray allocinitWithObjects:item0,item1,item2,item3,item4,nil; NSLog(%,array1); /*( item1, it

2、em2, item3, item4 )*/ /获取数组元素个数 NSLog(array count : %ld,array1.count); /*array count : 4*/ /获取特定所以元素 NSLog(array1 = %,array11); /* array1 = item1 */ NSLog(array1 = %,array1 objectAtIndex:(NSInteger)1); /* array1 = item1 */ NSLog(firstObject = %,array1.firstObject); /获取第一个元素 /* firstObject = item1 */

3、 NSLog(lastObject = %,array1.lastObject); /获取最后一个元素 /* lastObject = item4 */ /拼接数组 NSLog(%,array1 componentsJoinedByString:,); /* item0,item1,item2,item3,item4 */ /查找元素的索引，如果包含特定元素，返回具体索引，否则返回：9223372036854775807 NSLog(%ld,array1 indexOfObject:item11); /是否包含特定元素 NSLog(%i, array1 containsObject:item1

4、 = TRUE ? 1 : 0); /* 1 */ NSArray *subArray = array1 subarrayWithRange:NSMakeRange(1, 2); NSLog(%,subArray); /* ( item1, item2 ) */ /保存数组元素到本地文件，以xml格式序列化存储 array1 writeToFile:/Users/new/Desktop/array.txt atomically:YES; /* !DOCTYPE plist PUBLIC -/Apple/DTD PLIST 1.0/EN :/ item0 item1 item2 item3 it

5、em4 */ /读取本地文件，反序列化为数组 NSArray *array2 = NSArray allocinitWithContentsOfFile:/Users/new/Desktop/array.txt; NSLog(%,array2); /* ( item0, item1, item2, item3, item4 ) */ /判断数组元素是否相等 BOOL result = array1 isEqualToArray:item0,item1,item2; NSLog(%,result); /* 0 */ NSArray遍历void arrayTest2() NSArray *arra

6、y1 = NSArray allocinitWithObjects:item0,item1,item2,item3,item4,nil; /遍历方法1 for (int index = 0; index array1.count; index+) NSLog(%,array1index); /* item0 item1 item2 item3 item4 */ /遍历方法2 for (NSString *item in array1) NSLog(%,item); /* item0 item1 item2 item3 item4 */ /遍历方法3 /NSEnumerator *enumera

7、tor = array1 reverseObjectEnumerator; /逆向遍历 NSEnumerator *enumerator = array1 objectEnumerator; /正向遍历 NSString *item = nil; while (item = enumerator nextObject) NSLog(%,item); /* item0 item1 item2 item3 item4 */ /遍历方法4 array1 enumerateObjectsUsingBlock:(id obj, NSUInteger idx, BOOL *stop) NSLog(%ld

8、= %,idx,obj); ; /* 0 = item0 1 = item1 2 = item2 3 = item3 4 = item4 */ NSArray排序void arrayTest3() /排序方法1，普通比较器 NSArray *array1 = 1,21,11,5,51,3; NSArray *array2 = array1 sortedArrayUsingSelector:selector(compare:); NSLog(%,array2); /* ( 1, 11, 21, 3, 5, 51 ) */ /排序方法2，代码块 NSArray *array3 = array1 s

9、ortedArrayUsingComparator:NSComparisonResult(id obj1, id obj2) return obj1 compare:obj2; ; NSLog(%,array3); /* ( 1, 11, 21, 3, 5, 51 ) */ /排序方法3，自定义排序描述符 NSArray *originalArray = page_no:27,age:24, page_no:1, age:23, page_no:1, age:21, page_no:1, age:25, page_no:1, age:15, page_no:12,age:19, page_no

10、:23,age:29, page_no:3, age:22, page_no:2, age:30, page_no:17,age:33 ; NSSortDescriptor *alphaNumSD = NSSortDescriptor sortDescriptorWithKey:page_no ascending:YES comparator:NSComparisonResult(NSString *string1, NSString *string2) return string1 compare:string2 options:NSNumericSearch; ; NSSortDescri

11、ptor *dataNumSD = NSSortDescriptor sortDescriptorWithKey:age ascending:YES comparator:NSComparisonResult(id data1, id data2) return data1 compare:data2; ; NSArray *sortedArray = originalArray sortedArrayUsingDescriptors:alphaNumSD,dataNumSD; NSLog(%,sortedArray); /* ( age = 15; page_no = 1; , age =

12、21; page_no = 1; , age = 23; page_no = 1; , age = 25; page_no = 1; , age = 30; page_no = 2; , age = 22; page_no = 3; , age = 19; page_no = 12; , age = 33; page_no = 17; , age = 29; page_no = 23; , age = 24; page_no = 27; ) */ /排序方法4，自定义比较方法 Person *person1 = Person allocinitWithFirstName:hello lastN

13、ame:world age:35; Person *person2 = Person allocinitWithFirstName:abc lastName:def age:25; Person *person3 = Person allocinitWithFirstName:cal lastName:kdl age:22; NSArray *personArray = person1,person2,person3; NSArray *tempArray = personArray sortedArrayUsingSelector:selector(comparePeople:); NSLo

14、g(%,tempArray); /* ( firstName: abc,lastName:def,age:25, firstName: cal,lastName:kdl,age:22, firstName: hello,lastName:world,age:35 ) */ NSMutableArrayNSMutableArray继承NSArray,所以NSArray的所有特性NSMutableArray都有，在此基础上,NSMutableArray主要新增了添加、删除、更新、插入等特性，如下代码演示：void arrrayTest4() NSMutableArray *mutableArray

15、 = NSMutableArray allocinitWithObjects:item0,item1,item2,item3,item4, nil; NSLog(%,mutableArray); /* ( item0, item1, item2, item3, item4 ) */ /添加元素 mutableArray addObject:item5; NSLog(%,mutableArray); /* ( item0, item1, item2, item3, item4, item5 ) */ /插入元素 mutableArray insertObject:inserted item at

16、Index:(NSInteger)1; NSLog(%,mutableArray); /* ( item0, inserted item, item1, item2, item3, item4, item5 ) */ /删除元素 mutableArray removeObject:item5; NSLog(%,mutableArray); /* ( item0, item1, item2, item3, item4 ) */ /更新元素 mutableArray replaceObjectAtIndex:(NSInteger)5 withObject:replacedItem; NSLog(%

17、,mutableArray); /* ( item0, inserted item, item1, item2, item3, replacedItem ) */ /删除所有元素 mutableArray removeAllObjects; NSLog(%ld,mutableArray.count); /* 0 */ NSDictionary 字典初始化void arrayTest5() /字典初始化方式1 NSDictionary *dictionary1 = NSDictionary allocinitWithObjectsAndKeys:value0,key0, value1,key1,

18、 value2,key2, value3,key3, value4,key4, nil; NSLog(%,dictionary1); /* key0 = value0; key1 = value1; key2 = value2; key3 = value3; key4 = value4; */ /字典初始化方式2 NSArray *valueArray = value0,value1,value2,value3,value4; NSArray *keyArray = key0,key1,key2,key3,key4; NSDictionary *dictionary2 = NSDictiona

19、ry allocinitWithObjects:valueArray forKeys:keyArray; NSLog(%,dictionary2); /* key0 = value0; key1 = value1; key2 = value2; key3 = value3; key4 = value4; */ /字典初始化方式3 NSDictionary *dictionary3 = key0:value0, key1:value1, key2:value2, key3:value3, key4:value4 ; NSLog(%,dictionary3); /* key0 = value0;

20、key1 = value1; key2 = value2; key3 = value3; key4 = value4; */ /调用NSDictionary静态方法生成字典 NSDictionary *dictionary4 = NSDictionary dictionaryWithObject:value0 forKey:key0; NSLog(%,dictionary4); /* key0 = value0; */ NSDictionary *dictionary5 = NSDictionary dictionaryWithObjects:valueArray forKeys:keyArr

21、ay; NSLog(%,dictionary5); /* key0 = value0; key1 = value1; key2 = value2; key3 = value3; key4 = value4; */ NSDictionary *dictionary6 = NSDictionary dictionaryWithObjectsAndKeys:value0,key0,value1,key1,value2,key2,value3,key3,value4,key4, nil; NSLog(%,dictionary6); /* key0 = value0; key1 = value1; ke

22、y2 = value2; key3 = value3; key4 = value4; */ 字典基本常用用法void arrayTest6() NSDictionary *dictionary1 = NSDictionary allocinitWithObjectsAndKeys:value0,key0, value1,key1, value2,key2, value3,key3, value4,key4, value4,key5, nil; NSLog(%,dictionary1); /* key0 = value0; key1 = value1; key2 = value2; key3 =

23、 value3; key4 = value4; key5 = value4 */ NSLog(%ld,dictionary1.count); /* 5 */ /输出特定元素 NSLog(%,dictionary1key0); NSLog(%,dictionary1 objectForKey:key0); /* value0 */ /获取所有key NSLog(%,dictionary1.allKeys); /* ( key3, key1, key4, key2, key0 ) */ /获取所有value NSLog(%,dictionary1.allValues); /* ( value3,

24、value1, value4, value2, value0 ) */ /获取特定value对应的所有key NSLog(%,dictionary1 allKeysForObject:value4); /* ( key4, key5 ) */ /分别获取key对应的value,对于不存在的key，返回not found NSLog(%,dictionary1 objectsForKeys:key0,key1,key8 notFoundMarker:not found); /* ( value0, value1, not found ) */ NSDictionary *dictionaryOther = key0:value0; BOOL result = dictionary1 isEqualToDictionary:dictionaryOther; NSLog(%hhd,result); /* 0 */ /保存到本地文件 dictionary1 writeToFile:/Users/new/Desktop/dictionary.txt atomically:YES; /* !DOCTYPE plist PUBLIC -/Apple/DTD PLIST 1.0/EN :/ key0 value0 key1 value1 key2 value2 key3 value3 key4