/**
arrayByAddingObject
-- 往数组A添加一个数据，返回一个数组的形式，即必须有一个数组来接受
*/
NSArray *array = [NSArray arrayWithObjects:@"1",@"2",@"3", nil];
array = [array arrayByAddingObject:@"4"];
NSLog(@"-----addarr=%@-----", array); //>>1,2,3,4
/**
arrayByAddingObjectsFromArray
-- 往数组A添加一组数组B，返回数组类型，需要一个数组来接受数据
*/
NSArray *addArr2 = [array arrayByAddingObjectsFromArray:array];
NSLog(@"-----addArr2=%@-----", addArr2); //>>>1,2,3,4,1,2,3,4
/**
componentsJoinedByString
-- 将数据A以 需要的分隔符分割开，组成一个字符串：例如数组A= [1，2，3]；分隔符为^, 字符串为1^2^3
*/
NSString *arrayStr = [array componentsJoinedByString:@"^"];
NSLog(@"-----arrayStr=%@-----", arrayStr); //>>>1^2^3
/**
containsObject
-- 数组是否包含某个对象
*/
BOOL isContains = [array containsObject:@"5"];
NSLog(@"-----isContains=%d-----", isContains); //>>>NO
/**
description
*/
NSString *arrDes = [array description];
NSLog(@"-----description=%@-----", arrDes);
/**
indexOfObject
--判断 anObject 对象是否存在数组中如果存在返回，对象所在的下标;如果不存在，返回NSNotFund
*/
NSUInteger index = [addArr2 indexOfObject:@"5"];
NSLog(@"-----index=%ld-----", index);
/**
indexOfObjectIdenticalTo: inRange:
-- 判断 anObject 对象是否存在数组中range范围内，如果存在，返回下标了；如果不存在，返回NSNotFund
*/
NSUInteger index2 = [addArr2 indexOfObject:@"3" inRange:NSMakeRange(1, 3)];
NSLog(@"-----index2 = %ld-----", index2); // 2
/**
objectEnumerator --正序遍历数组
reverseObjectEnumerator --反序遍历数组
*/
NSEnumerator *rator = [array objectEnumerator];
id obj = nil;
while (obj = [rator nextObject]) {
NSLog(@"----obj=-%@-----",obj);
}
/**
isEqualToArray
-- 两个数组是否相等
*/
BOOL isSame = [addArr2 isEqualToArray:array];
NSLog(@"-----isSame = %d-----", isSame);
/**
sortedArrayUsingSelector
-- 如果只是对字符串排序的话， 可以利用 字符串自带的compare：方法；也可以自己写compare：方法，进行对象的比较
*/
/**
subarrayWithRange
-- 截取数组 range的数组
*/
NSArray *subArray = [addArr2 subarrayWithRange:NSMakeRange(2, 4)];
NSLog(@"-----subArray=%@-----", subArray);
/**
writeToFile: atomically:
-- 把数据写入本地
*/
/**
writeToURL: atomically:
--保存数组至一个URL
*/
/**
makeObjectsPerformSelector:(SEL)aSelector
-- 让每个数组都调用 aSelector 这个方法
*/
NSLog(@"-----addArr2=%@-----", addArr2);
/**
objectAtIndexedSubscript:
-- 获取数组中 idx 索引的数据
*/
NSString *strIndex = [addArr2 objectAtIndexedSubscript:3];
NSLog(@"-----strIndex=%@-----", strIndex); //>>>4
/**
enumerateObjectsUsingBlock:
-- 这个方法也是一种循环的方法与for，while实现的功能一样；当stop = yes的时候，就停止循环
*/
[addArr2 enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
// NSLog(@"-----obj= %@ idx = %ld -----", obj, idx);
}];
/**
enumerateObjectsWithOptions:(NSEnumerationOptions)opts usingBlock:
-- 这个方法也是一种循环的方法与for，while实现的功能一样；当stop = yes的时候，就停止循环
*/
//NSEnumerationReverse 倒序遍历
[array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"-----obj= %@ idx = %ld -----", obj, idx);
//当需要结束循环的时候,调用stop,赋予YES
// if (idx ==3) {
// *stop = YES;
// }
}];
/**
enumerateObjectsAtIndexes:(NSIndexSet *)s options:
-- 在制定的数组范围 s 内 遍历数据
*/
[addArr2 enumerateObjectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(2, 4)] options:NSEnumerationReverse usingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSLog(@"-----obj= %@ idx = %ld -----", obj, idx);
}];
/**
indexOfObjectPassingTest
-- 根据条件用来获取一个NSUIndex 对象，主要是根据条件进行数据遍历使用
*/
NSInteger testIndex = [array indexOfObjectPassingTest:^ BOOL (id tr,NSUInteger index, BOOL *te){
NSString *s = (NSString *)tr;
if([@"4" isEqualToString:s])
{
return YES;
}
return NO;
}];
NSLog(@"index==%ld=.",testIndex); //>>> 3
/**
sortedArrayUsingComparator:
-- 排序 ， 这个方法本身就是按递增的方式排序。
NSOrderedAscending
-The left operand is smaller than the right operand.
NSOrderedSame
-The two operands are equal.
NSOrderedDescending
-The left operand is greater than the right operand
*/
NSArray *numberArray = @[@"3", @"4", @"9", @"1"]; //递增
NSArray *sortArray = [numberArray sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
if ([obj1 integerValue] > [obj2 integerValue]) {
return NSOrderedDescending;
}else {
return NSOrderedAscending;
}
}];
NSLog(@"-----sortArray=%@-----", sortArray); //>>>1 3 4 9
/**
sortedArrayWithOptions:(NSSortOptions)opts usingComparator
-- 与上个方法一致
*/
此外还提供了NAMutableArray的方法，这个方法常用，都知道意思，只列举方法：
@interface NSMutableArray<ObjectType> : NSArray<ObjectType>
- (void)addObject:(ObjectType)anObject; --往数组添加数据
- (void)insertObject:(ObjectType)anObject atIndex:(NSUInteger)index; --往数组的第index下标插入一个anobject数据
- (void)removeLastObject; -- 移除数组的最后一个数据
- (void)removeObjectAtIndex:(NSUInteger)index; --移除数组中第index个数据
- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(ObjectType)anObject; --用 anobject 替换 数组 中 第index个数据
- (instancetype)init NS_DESIGNATED_INITIALIZER;
- (instancetype)initWithCapacity:(NSUInteger)numItems NS_DESIGNATED_INITIALIZER;
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;
@end
@interface NSMutableArray<ObjectType> (NSExtendedMutableArray)
- (void)addObjectsFromArray:(NSArray<ObjectType> *)otherArray;
- (void)exchangeObjectAtIndex:(NSUInteger)idx1 withObjectAtIndex:(NSUInteger)idx2;
- (void)removeAllObjects;
- (void)removeObject:(ObjectType)anObject inRange:(NSRange)range;
- (void)removeObject:(ObjectType)anObject;
- (void)removeObjectIdenticalTo:(ObjectType)anObject inRange:(NSRange)range;
- (void)removeObjectIdenticalTo:(ObjectType)anObject;
- (void)removeObjectsFromIndices:(NSUInteger *)indices numIndices:(NSUInteger)cnt NS_DEPRECATED(10_0, 10_6, 2_0, 4_0);
- (void)removeObjectsInArray:(NSArray<ObjectType> *)otherArray;
- (void)removeObjectsInRange:(NSRange)range;
- (void)replaceObjectsInRange:(NSRange)range withObjectsFromArray:(NSArray<ObjectType> *)otherArray range:(NSRange)otherRange;
- (void)replaceObjectsInRange:(NSRange)range withObjectsFromArray:(NSArray<ObjectType> *)otherArray;
- (void)setArray:(NSArray<ObjectType> *)otherArray;
- (void)sortUsingFunction:(NSInteger (NS_NOESCAPE *)(ObjectType, ObjectType, void * _Nullable))compare context:(nullable void *)context;
- (void)sortUsingSelector:(SEL)comparator;
- (void)insertObjects:(NSArray<ObjectType> *)objects atIndexes:(NSIndexSet *)indexes;
- (void)removeObjectsAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectsAtIndexes:(NSIndexSet *)indexes withObjects:(NSArray<ObjectType> *)objects;
- (void)setObject:(ObjectType)obj atIndexedSubscript:(NSUInteger)idx NS_AVAILABLE(10_8, 6_0);
- (void)sortUsingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);
- (void)sortWithOptions:(NSSortOptions)opts usingComparator:(NSComparator NS_NOESCAPE)cmptr NS_AVAILABLE(10_6, 4_0);
@end
@interface NSMutableArray<ObjectType> (NSMutableArrayCreation)
+ (instancetype)arrayWithCapacity:(NSUInteger)numItems;
+ (nullable NSMutableArray<ObjectType> *)arrayWithContentsOfFile:(NSString *)path;
+ (nullable NSMutableArray<ObjectType> *)arrayWithContentsOfURL:(NSURL *)url;
- (nullable NSMutableArray<ObjectType> *)initWithContentsOfFile:(NSString *)path;
- (nullable NSMutableArray<ObjectType> *)initWithContentsOfURL:(NSURL *)url;