计算该套数字,使国家志愿人员在指数中排出,将国家志愿人员增加到一个阵列。

这是你如何做的。 我不敢肯定,我看到把一套指数变成一个效率较低的代表点。

为了列举一套办法,你有两种选择。 如果你重新瞄准第10.6号或第4号,你可使用<代码>数字表示:。 如果你重新瞄准以前的版本,就必须获得<代码>Index,然后要求indexGreaterThanIndex:,直至您获得<>NS NotFound。

NSIndexSet *selectedItems = [aTableView selectedRowIndexes];

NSMutableArray *selectedItemsArray=[NSMutableArray array];
    [selectedItems enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
        [selectedItemsArray addObject:[NSNumber numberWithInteger:idx]];
    }];

你们可以迅速做以下工作:

extension NSIndexSet {
    func toArray() -> [Int] {
        var indexes:[Int] = [];
        self.enumerateIndexesUsingBlock { (index:Int, _) in
            indexes.append(index);
        }
        return indexes;
    }
}

届时,你可以这样做。

selectedItems.toArray()

样本代码如下:

NSIndexSet *filteredObjects = [items indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {do testing here}];

NSArray *theObjects = [theItems objectsAtIndexes:filteredObjects]

Availability Available in iOS 2.0 and later.

我这样做的办法是在NSIndexSet设立一个类别。 这使其规模小、效率高,要求我制定很少的法典。

我的界面(NSIndexSet_Arrays.h):

/**
 *  Provides a category of NSIndexSet that allows the conversion to and from an NSDictionary
 *  object.
 */
@interface NSIndexSet (Arrays)

/**
 *  Returns an NSArray containing the contents of the NSIndexSet in a format that can be persisted.
 */
- (NSArray*) arrayRepresentation;

/**
 * Returns an array of NSNumber objects representing each index in the set.
 */
- (NSArray<NSNumber*>*) arrayOfNumbersRepresentation;

/**
 *  Initialises self with the indexes found wtihin the specified array that has previously been
 *  created by the method @see arrayRepresentation.
 */
+ (NSIndexSet*) indexSetWithArrayRepresentation:(NSArray*)array;

@end

(NSIndexSet_Arrays.m):

#import "NSIndexSet_Arrays.h"

@implementation NSIndexSet (Arrays)

/**
 *  Returns an NSArray containing the contents of the NSIndexSet in a format that can be persisted.
 */
- (NSArray*) arrayRepresentation {
    NSMutableArray *result = [NSMutableArray array];

    [self enumerateRangesUsingBlock:^(NSRange range, BOOL *stop) {
        [result addObject:NSStringFromRange(range)];
    }];

    return [NSArray arrayWithArray:result];
}

/**
 * Returns an array of NSNumber objects representing each index in the set.
 */
- (NSArray<NSNumber*>*) arrayOfNumbersRepresentation {
    NSMutableArray<NSNumber*> *result = [NSMutableArray array];

    [self enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL * _Nonnull stop) {
        [result addObject:[NSNumber numberWithInteger:idx]];
    }];

    return [NSArray arrayWithArray:result];
}

/**
 *  Initialises self with the indexes found wtihin the specified array that has previously been
 *  created by the method @see arrayRepresentation.
 */
+ (NSIndexSet*) indexSetWithArrayRepresentation:(NSArray*)array {
    NSMutableIndexSet *result = [NSMutableIndexSet indexSet];
    
    for (NSString *range in array) {
        [result addIndexesInRange:NSRangeFromString(range)];
    }
    
    return result;
}


@end