第一次学习英文官方文档,有很多不懂得地方,暂时空着,回头查询中文文档再补全,如果有大神愿意指点,请留言,感谢!!!
1、创建一个Array
//1>创建一个空数组
+ (instancetype)array;
//demo
NSArray *arr = [NSArray array];
//2>创建并返回一个数组,这个数组拥有另一个数组中的对象
+ (instancetype)arrayWithArray:(NSArray<ObjectType> *)array;
//demo
NSArray *arr = [NSArray arrayWithArray:arr1];
//3>创建并返回一个数组,这个数组中包含路径指定文件中的内容
+ (NSArray<ObjectType> *)arrayWithContentsOfFile:(NSString *)path;
//demo
NSArray *arr = [NSArray arrayWithContentsOfFile:path];
//4>创建并返回一个数组,这个数组中包含指定url中的内容
+ (NSArray<ObjectType> *)arrayWithContentsOfURL:(NSURL *)url;
//demo
NSArray *arr = [NSArray arrayWithContentsOfURL:url];
//5>创建并返回一个数组,这个数组中包含一个指定的对象
+ (instancetype)arrayWithObject:(ObjectType)anObject;
//demo
NSArray *arr = [NSArray arrayWithObject:@"one"];
//6>创建并返回一个数组,这个数组中包含一列对象
+ (instancetype)arrayWithObjects:(ObjectType)firstObj, ...;
//demo
NSArray *arr = [NSArray arrayWithObjects:@"one", @"two", @"three", nil];
//7>没用过
+ (instancetype)arrayWithObjects:(const ObjectType _Nonnull [])objects count:(NSUInteger)cnt;
2>初始化一个数组
//1>初始化一个最新分配内存的数组
- (instancetype)init;
//demo
NSArray *arr = [[NSArray alloc] init];
//2>初始化一个最新分配内存的数组,这个数组拥有另一个数组中的对象
- (instancetype)initWithArray:(NSArray<ObjectType> *)array;
//demo
NSArray *arr = [[NSArray alloc] initWithArray:arr1];
//3>初始化一个最新分配内存的数组,这个数组拥有另一个数组中的对象,并可选择是否copy数组中对象
- (instancetype)initWithArray:(NSArray<ObjectType> *)array copyItems:(BOOL)flag;
//demo
NSArray *arr = [[NSArray alloc] initWithArray:arr1 copyItems:YES];
//4>初始化一个最新分配内存的数组,这个数组中包含指定路径下文件的内容
- (NSArray<ObjectType> *)initWithContentsOfFile:(NSString *)path;
//demo
NSArray *arr = [[NSArray alloc] initWithContentsOfFile:path];
//5>初始化一个最新分配内存的数组,这个数组中包含指定url中的内容
- (NSArray<ObjectType> *)initWithContentsOfURL:(NSURL *)url;
//demo
NSArray *arr = [[NSArray alloc] initWithContentsOfURL:url];
//6>初始化一个最新分配内存的数组,这个数组中包含一列对象
- (instancetype)initWithObjects:(ObjectType)firstObj, ...;
//demo
NSArray *arr = [NSArray arrayWithObjects:@"one", @"two", @"three", nil];
//7>没用过
- (instancetype)initWithObjects:(ObjectType _Nonnull const [])objects count:(NSUInteger)cnt;
3、查询一个字典
//1>判断数组中是否包含指定对象
- (BOOL)containsObject:(ObjectType)anObject;
//demo
NSArray *arr1 = @[@"1",@"2",@"3"];
BOOL isContain = [arr1 containsObject:@"1"];
NSLog(@"isContain = %d",isContain);//isContain = 1
//2>判断数组中对象的数量
@property(readonly) NSUInteger count;
//demo
NSUInteger num = arr1.count;
//3>
- (void)getObjects:(ObjectType _Nonnull [])objects;
//4>
- (void)getObjects:(ObjectType _Nonnull [])objects range:(NSRange)range;
//5>获取数组中第一个对象
@property(nonatomic, readonly) ObjectType firstObject;
//6>获取数组中最后一个对象
@property(nonatomic, readonly) ObjectType lastObject;
//7>获取数组中指定位置的对象
- (ObjectType)objectAtIndex:(NSUInteger)index;
//demo
ObjectType obj = [arr1 objectAtIndex:1];
//8>获取数组中指定位置的对象
- (ObjectType)objectAtIndexedSubscript:(NSUInteger)idx;
//9>获取索引集合中所有索引对应位置的对象,组成新的数组
- (NSArray<ObjectType> *)objectsAtIndexes:(NSIndexSet *)indexes;
//demo
NSArray *arr1 = @[@"1",@"2",@"3"];
NSMutableIndexSet *set = [NSMutableIndexSet indexSet];
[set addIndex:0];
[set addIndex:2];
NSArray *arr2 = [arr1 objectsAtIndexes:set];// (1,3)
//10>数组转化为枚举类型
- (NSEnumerator<ObjectType> *)objectEnumerator;
4、查询数组中相应对象的位置(建议使用前先判断是否存在,然后查询位置)
//1>返回数组中与给定的对象相等对象的最小索引
- (NSUInteger)indexOfObject:(ObjectType)anObject;
//demo
NSArray *arr = @[@"1",@"2",@"3"];
NSUInteger index = [arr indexOfObject:@"1"];
//2>返回数组中特定范围内与给定的对象相等对象的最小索引
- (NSUInteger)indexOfObject:(ObjectType)anObject inRange:(NSRange)range;
//demo
NSArray *arr = @[@"1",@"2",@"3"];
NSInteger index1 = [arr indexOfObject:@"3" inRange:NSMakeRange(2, 1)];
//3>返回数组中与给定的对象完全相同对象的最小索引
- (NSUInteger)indexOfObjectIdenticalTo:(ObjectType)anObject;
//demo
NSArray *arr1 = [[NSArray alloc] initWithObjects:@"1", nil];
NSArray *arr2 = [[NSArray alloc] initWithObjects:@"1", @"2", nil];
NSArray *arr3 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", nil];
NSArray *arr = @[arr1,arr2,arr3];
NSInteger index1 = [arr indexOfObjectIdenticalTo:arr1];
//4>返回数组中特定范围内与给定的对象完全相同对象的最小索引
- (NSUInteger)indexOfObjectIdenticalTo:(ObjectType)anObject inRange:(NSRange)range;
//demo
NSArray *arr1 = [[NSArray alloc] initWithObjects:@"1", nil];
NSArray *arr2 = [[NSArray alloc] initWithObjects:@"1", @"2", nil];
NSArray *arr3 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", nil];
NSArray *arr = @[arr1,arr2,arr3];
NSInteger index2 = [arr indexOfObjectIdenticalTo:arr1 inRange:NSMakeRange(0, 2)];
//5>
- (NSUInteger)indexOfObjectPassingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//6>
- (NSUInteger)indexOfObjectWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//7>
- (NSUInteger)indexOfObjectAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts passingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//8>
- (NSIndexSet *)indexesOfObjectsPassingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//9>
- (NSIndexSet *)indexesOfObjectsWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//10>
- (NSIndexSet *)indexesOfObjectsAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts passingTest:(BOOL (^)(ObjectType obj, NSUInteger idx, BOOL *stop))predicate;
//11>
- (NSUInteger)indexOfObject:(ObjectType)obj inSortedRange:(NSRange)r options:(NSBinarySearchingOptions)opts usingComparator:(NSComparator)cmp;
5、Sending Message to Elements
//1>
- (void)makeObjectsPerformSelector:(SEL)aSelector;
//2>
- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument;
//3>
- (void)enumerateObjectsUsingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block;
//4>
- (void)enumerateObjectsWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block;
//5>
- (void)enumerateObjectsAtIndexes:(NSIndexSet *)s options:(NSEnumerationOptions)opts usingBlock:(void (^)(ObjectType obj, NSUInteger idx, BOOL *stop))block;
6、数组比较
//1>返回两个数组中第一个相等的对象
- (ObjectType)firstObjectCommonWithArray:(NSArray<ObjectType> *)otherArray;
//2>比较两个数组是否相等
- (BOOL)isEqualToArray:(NSArray<ObjectType> *)otherArray;
7、得到新的数组
//1>拷贝一个数组,在其末尾增加一个对象并返回
- (NSArray<ObjectType> *)arrayByAddingObject:(ObjectType)anObject;
//demo
NSArray *arr4 = [arr1 arrayByAddingObject:@"4"];
//2>拷贝一个数组,在其末尾增加另一个数组的所有对象并返回
- (NSArray<ObjectType> *)arrayByAddingObjectsFromArray:(NSArray<ObjectType> *)otherArray;
//3>
- (NSArray<ObjectType> *)filteredArrayUsingPredicate:(NSPredicate *)predicate;
//4>复制数组中给定范围内的对象,并作为新数组返回
- (NSArray<ObjectType> *)subarrayWithRange:(NSRange)range;
//demo
NSArray *arr3 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", nil];
NSArray *arr4 = [arr3 subarrayWithRange:NSMakeRange(0, 2)];
8、排序
//1>
@property(readonly, copy) NSData *sortedArrayHint;
//2>
- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (*)(ObjectType, ObjectType, void *))comparator context:(void *)context;
//3>
- (NSArray<ObjectType> *)sortedArrayUsingFunction:(NSInteger (*)(ObjectType, ObjectType, void *))comparator context:(void *)context hint:(NSData *)hint;
//4>
- (NSArray<ObjectType> *)sortedArrayUsingDescriptors:(NSArray<NSSortDescriptor *> *)sortDescriptors;
//5>
- (NSArray<ObjectType> *)sortedArrayUsingSelector:(SEL)comparator;
//6>
- (NSArray<ObjectType> *)sortedArrayUsingComparator:(NSComparator)cmptr;
//7>
- (NSArray<ObjectType> *)sortedArrayWithOptions:(NSSortOptions)opts usingComparator:(NSComparator)cmptr;
9、用字符串拼接数组
- (NSString *)componentsJoinedByString:(NSString *)separator;
//demo
NSArray *arr4 = [[NSArray alloc] initWithObjects:@"2", @"1", @"3", nil];
NSString *str = [arr4 componentsJoinedByString:@","];
10、创建描述
//1>
@property(readonly, copy) NSString *description;
//2>
- (NSString *)descriptionWithLocale:(id)locale;
//3>
- (NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level;
11、存储数组
//1>将数组存入指定的路径文件下
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;
//2>将数组存入指定的url中
- (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomically;
12、收集路径
- (NSArray<NSString *> *)pathsMatchingExtensions:(NSArray<NSString *> *)filterTypes;
13、观察者模式(Key-Value Observing)
使用:http://www.jianshu.com/p/b0c30891f1bf
//1>添加观察者
- (void)addObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context;
//demo
[_a addObserver:_b forKeyPath:@"name" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:NULL];
//2>移除观察者
- (void)removeObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath;
//demo
[_a removeObserver:_b forKeyPath:@"name"];
//3>移除观察者
- (void)removeObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath context:(void *)context;
//demo
[_a removeObserver:_b forKeyPath:@"name" context:NULL];
//4>移除观察者
- (void)removeObserver:(NSObject *)observer fromObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath context:(void *)context;
//5>添加观察者
- (void)addObserver:(NSObject *)observer toObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context;
//6>移除观察者
- (void)removeObserver:(NSObject *)observer fromObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath;
14、键-值编码(Key-Value Coding)
//1>写值
- (void)setValue:(id)value forKey:(NSString *)key;
//2>取值
- (id)valueForKey:(NSString *)key;
15、Randomly Shuffling an Array
//1>
- (NSArray<ObjectType> *)shuffledArray;
//2>
- (NSArray<ObjectType> *)shuffledArrayWithRandomSource:(GKRandomSource *)randomSource;
16、新方法
- (instancetype)initWithCoder:(NSCoder *)aDecoder;