【Foundation-37-1】#import <Foundation/NSIndexSet.h>不可索引集合

NSIndexSet 用来让你从某个 data structure 里面提取一部分东西出来成为一个新的东西。

比如你有一个 NSArray, 里面是

(one, two, three, four, five)

然后你造了个 indexSet 的内容是 0,1,2,4

然后你把它套到那个 array 上，就是 (one, two,three,five)

@interface NSIndexSet :NSObject <NSCopying,NSMutableCopying,
NSSecureCoding> {

@protected

【初始化】

+ (instancetype)indexSet;

+ (instancetype)indexSetWithIndex:(NSUInteger)value;

+ (instancetype)indexSetWithIndexesInRange:(NSRange)range;

- (instancetype)initWithIndexSet:(NSIndexSet *)indexSet NS_DESIGNATED_INITIALIZER;

- (instancetype)initWithIndex:(NSUInteger)value;

- (instancetype)initWithIndexesInRange:(NSRange)range NS_DESIGNATED_INITIALIZER;

- (BOOL)isEqualToIndexSet:(NSIndexSet *)indexSet;// 比较

@property (readonly)NSUInteger count;// 数量

@property (readonly)NSUInteger firstIndex;// 第一个

@property (readonly)NSUInteger lastIndex;// 最后一个

- (NSUInteger)getIndexes:(NSUInteger *)indexBuffer maxCount:(NSUInteger)bufferSize inIndexRange:(NSRangePointer)range;// 阿西吧，待研究

- (NSUInteger)countOfIndexesInRange:(NSRange)range NS_AVAILABLE(10_5, 2_0);// 在（x，y）范围内的个数

【大于小于】

- (NSUInteger)indexGreaterThanIndex:(NSUInteger)value;// 大于value
的第一个位置

- (NSUInteger)indexLessThanIndex:(NSUInteger)value;// 小雨value
的第一个位置

- (NSUInteger)indexGreaterThanOrEqualToIndex:(NSUInteger)value;// 大于等于
value 的第一个位置

- (NSUInteger)indexLessThanOrEqualToIndex:(NSUInteger)value;// 小于等于
value 的第一个位置

【判断】

- (BOOL)containsIndex:(NSUInteger)value;// 是否包含
value

- (BOOL)containsIndexesInRange:(NSRange)range;// 是否包含
range

- (BOOL)containsIndexes:(NSIndexSet *)indexSet;// 是否包含
indexSet

- (BOOL)intersectsIndexesInRange:(NSRange)range;// 是否与 range
有交集

【遍历】

- (void)enumerateIndexesUsingBlock:(void (^)(NSUInteger idx,BOOL *stop))block
NS_AVAILABLE(10_6,
4_0);

- (void)enumerateIndexesWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(NSUInteger idx,BOOL
*stop))block NS_AVAILABLE(10_6,
4_0);

- (void)enumerateIndexesInRange:(NSRange)range options:(NSEnumerationOptions)opts usingBlock:(void (^)(NSUInteger
idx, BOOL *stop))block
NS_AVAILABLE(10_6,
4_0);

NSRange myRange = NSMakeRange(1, 4);
NSIndexSet *indexset = [[NSIndexSet alloc]initWithIndexesInRange:myRange];

[indexset enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
NSLog(@"%ld",idx);
}];

【遍历符合条件的个数】

- (NSUInteger)indexPassingTest:(BOOL (^)(NSUInteger idx,BOOL *stop))predicate
NS_AVAILABLE(10_6,
4_0);

- (NSUInteger)indexWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (^)(NSUInteger idx,BOOL
*stop))predicate NS_AVAILABLE(10_6,
4_0);

- (NSUInteger)indexInRange:(NSRange)range options:(NSEnumerationOptions)opts passingTest:(BOOL (^)(NSUInteger
idx, BOOL *stop))predicate
NS_AVAILABLE(10_6,
4_0);

NSArray *arr = @[@"0",@"1",@"2",@"3",@"4"];

NSRange myRange = NSMakeRange(1, 4);
NSIndexSet *indexset = [[NSIndexSet alloc]initWithIndexesInRange:myRange];

NSUInteger test = [indexset indexPassingTest:^BOOL(NSUInteger idx, BOOL *stop) {
if ([[arr objectAtIndex:idx]isEqualToString:@"3"]) {
NSLog(@"ok");//test +1；
return YES;
}else{
NSLog(@"no");
return NO;//结束
}
}];

【遍历符合条件的索引集合】

- (NSIndexSet *)indexesPassingTest:(BOOL (^)(NSUInteger idx,BOOL *stop))predicate
NS_AVAILABLE(10_6,
4_0);

- (NSIndexSet *)indexesWithOptions:(NSEnumerationOptions)opts passingTest:(BOOL (^)(NSUInteger idx,BOOL
*stop))predicate NS_AVAILABLE(10_6,
4_0);

- (NSIndexSet *)indexesInRange:(NSRange)range options:(NSEnumerationOptions)opts passingTest:(BOOL (^)(NSUInteger
idx, BOOL *stop))predicate
NS_AVAILABLE(10_6,
4_0);

NSArray *arr = @[@"0",@"2",@"2",@"3",@"4"];

NSRange myRange = NSMakeRange(1, 4);
NSIndexSet *indexset = [[NSIndexSet alloc]initWithIndexesInRange:myRange];

NSIndexSet *test1 = [indexset indexesPassingTest:^BOOL(NSUInteger idx, BOOL *stop) {
if ([[arr objectAtIndex:idx]isEqualToString:@"2"]) {
NSLog(@"ok");//test +1；
return YES;
}else{
NSLog(@"no");
return NO;//结束
}

}];

【遍历其中的所有范围】

- (void)enumerateRangesUsingBlock:(void (^)(NSRange range,BOOL *stop))block
NS_AVAILABLE(10_7,
5_0);

- (void)enumerateRangesWithOptions:(NSEnumerationOptions)opts usingBlock:(void (^)(NSRange range,BOOL
*stop))block NS_AVAILABLE(10_7,
5_0);

- (void)enumerateRangesInRange:(NSRange)range options:(NSEnumerationOptions)opts usingBlock:(void (^)(NSRange
range, BOOL *stop))block
NS_AVAILABLE(10_7,
5_0);

NSMutableIndexSet *muindex = [NSMutableIndexSet indexSet];
[muindex addIndex:1];
[muindex addIndex:3];
[muindex addIndex:4];
[muindex addIndex:5];
[muindex addIndex:5];
[muindex addIndex:7];

[muindex enumerateRangesUsingBlock:^(NSRange range, BOOL *stop) {
NSLog(@"%lu",(unsigned long)range.location);
NSLog(@"%lu",range.length);
}];

@end