不可变数组NSArray(可存储不同类型的对象)
1.属性
@property(readonly) NSUInteger count
@property(nonatomic, readonly) ObjectType firstObject
@property(nonatomic, readonly) ObjectType lastObject
2.方法
- (BOOL)containsObject:(ObjectType)anObject
判断数组中是否包含某个对象
- (ObjectType)objectAtIndex:(NSUInteger)index
获取数组中索引为index的元素
- (void)getObjects:(ObjectType _Nonnull [])aBuffer
获取数组里面的元素到缓存aBuffer中
- (NSEnumerator<ObjectType> *)objectEnumerator
得到数组的枚举器
用法:
NSEnumerator *enumerator = [myArray objectEnumerator];
id anObject;
while (anObject = [enumerator nextObject]) {
}
- (NSEnumerator<ObjectType> *)reverseObjectEnumerator
得到数组的反序枚举器,用法如上
- (NSUInteger)indexOfObject:(ObjectType)anObject
得到对象anObject在数组中的索引index
- (BOOL)isEqualToArray:(NSArray<ObjectType> *)otherArray
判断两个数组是否相同
- (NSArray<ObjectType> *)arrayByAddingObject:(ObjectType)anObject
添加anObject对象到数组最后一个元素
- (NSArray<ObjectType> *)arrayByAddingObjectsFromArray:(NSArray<ObjectType> *)otherArray
将otherArray数组的元素添加到数组的末尾
- (NSArray<ObjectType> *)sortedArrayUsingSelector:(SEL)comparator
使用comparator比较方法对数组进行排序
- (NSString *)componentsJoinedByString:(NSString *)separator
将数组元素用separator分隔符连接成一个字符串
- (void)setValue:(id)value forKey:(NSString *)key
- (id)valueForKey:(NSString *)key
可变数组NSMutableArray
- (void)addObject:(ObjectType)anObject
添加元素
- (void)insertObject:(ObjectType)anObject atIndex:(NSUInteger)index
在插入元素anObject到索引为index的位置上
- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(ObjectType)anObject
将索引为index的元素替换为anObject对象
- (void)removeAllObjects
移除数组中所有元素
- (void)removeLastObject
移除数组中最后一个元素
- (void)removeObject:(ObjectType)anObject
移除数组中和对象anObject一样的元素
- (void)removeObjectAtIndex:(NSUInteger)index
移除索引为index的元素
- (void)setArray:(NSArray<ObjectType> *)otherArray
将数组内容替换为otherArray数组
- (void)exchangeObjectAtIndex:(NSUInteger)idx1 withObjectAtIndex:(NSUInteger)idx2
将索引为idx1的元素和索引为idx2的元素相交换
- (void)sortUsingSelector:(SEL)comparator
使用comparator比较方法进行排序
转载请注明：作者SmithJackyson