在Objective C中创建一个整数属性数组

#import<Foundation/Foundation.h>

@interface IntegerArray : NSObject

@property (nonatomic, strong) NSMutableArray *integerArray;

- (void)addInteger:(NSInteger)integer;
- (void)removeIntegerAtIndex:(NSUInteger)index;
- (NSInteger)getIntegerAtIndex:(NSUInteger)index;

@end

@implementation IntegerArray

- (instancetype)init {
    self = [super init];
    if (self) {
        _integerArray = [NSMutableArray new];
    }
    return self;
}

- (void)addInteger:(NSInteger)integer {
    [_integerArray addObject:@(integer)];
}

- (void)removeIntegerAtIndex:(NSUInteger)index {
    [_integerArray removeObjectAtIndex:index];
}

- (NSInteger)getIntegerAtIndex:(NSUInteger)index {
    return [(NSNumber *)_integerArray[index] integerValue];
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        IntegerArray *array = [IntegerArray new];
        [array addInteger:1];
        [array addInteger:2];
        [array addInteger:3];
        
        NSLog(@"Integer at index 0: %ld", (long)[array getIntegerAtIndex:0]);
        NSLog(@"Integer at index 1: %ld", (long)[array getIntegerAtIndex:1]);
        NSLog(@"Integer at index 2: %ld", (long)[array getIntegerAtIndex:2]);
        
        [array removeIntegerAtIndex:1];
        
        NSLog(@"Integer at index 0: %ld", (long)[array getIntegerAtIndex:0]);
        NSLog(@"Integer at index 1: %ld", (long)[array getIntegerAtIndex:1]);
    }
    return 0;
}