将NSInteger对象添加到NSMutableArray

Question

我有一个NSMutableArray

@interface DetailViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {

NSMutableArray *reponses;
}
@property (nonatomic, retain) NSMutableArray *reponses;

@end

我正在尝试添加我的数组NSInteger对象:

@synthesize reponses;



NSInteger val2 = [indexPath row];
[reponses addObject:[NSNumber numberWithInteger:val2]];
NSLog(@"the array is %@ and the value is %i",reponses, val2);

如果没有将对象添加到数组中它将无法工作,这是控制台显示的内容:

the array is (null) and the value is 2

Answer 1

@Omz:是的.确保已分配和初始化阵列.请检查以下代码

NSMutableArray *array = [[NSMutableArray alloc] init];
NSInteger num = 7;
NSNumber *number = [NSNumber numberWithInt:num];
[ar addObject:number];
NSLog(@"Array %@",array);

我已经检查了这个并且它有效.如果array不再需要,请确保release它.

Answer 2

您没有初始化数组，因此nil当您尝试添加数组时它仍然存在。

self.responses = [NSMutableArray array];
//now you can add to it.