如何從iPhone上的NSMutableArray中檢索整數值？

Question

如何從NSMutableArray中獲取整數值？

Answer 1

你需要使用NSNumber ：

myArray = [NSMutableArray array];
[myArray addObject:[NSNumber numberWithInteger:1234]];

//..

int theNumber = [[myArray objectAtIndex:0] integerValue];

Answer 2

如果你願意，你有這個擴展

創建文件extends.h在項目中添加此代碼和#import“extends.h” ：

/*______________________________ Extends NSMutableArray ______________________________*/
/**
 * Extend NSMutableArray
 * By DaRkD0G
 */
@interface NSMutableArray (NSArrayAdd)
/**
 *  Get element at index
 *
 *  @param index
 */
- (NSObject *) getAt:(int) index;
@end
/**
 * Extend NSMutableArray Method
 * By DaRkD0G
 */
@implementation NSMutableArray (NSArrayAdd)
/**
 *  Get element at index
 *
 *  @param index
 */
- (NSObject *) getAt:(int) index {
    NSInteger anIndex = index;
    NSObject *object = [self objectAtIndex:anIndex];
    if (object == [NSNull null]) {
        return nil;
    } else {
        NSLog(@"OK found ");
        return object;
    }

}
@end
/*______________________________ Extends NSArray ______________________________*/
/**
 * Extend NSArray
 * By DaRkD0G
 */
@interface NSArray (NSArrayAdd)
/**
 *  Get element at index
 *
 *  @param index
 */
- (NSObject *) getAt:(int) index;
@end
/**
 * Extend NSArray Method
 * By DaRkD0G
 */
@implementation NSArray (NSArrayAdd)
/**
 *  Get element at index
 *
 *  @param index
 */
- (NSObject *) getAt:(int) index {
    NSInteger anIndex = index;
    NSObject *object = [self objectAtIndex:anIndex];
    if (object == [NSNull null]) {
        return nil;
    } else {
        NSLog(@"OK found ");
        return object;
    }

}
@end

采用 ：

NSObject object = [self.arrayItem getAt:0];
NSObject object2 = [self.arrayItem getAt:50];