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将整数添加到NSMUtableArray

[英]add integer to NSMUtableArray

我是新的iPad开发人员。

我在点击按钮时实现了UIPopover,弹出框包含整数值,

当我尝试用整数填充数组时,它向我显示SIGABRT索引3超出范围,我看不到日志,应用崩溃。

这是我的代码段:

-(void)btnClick:(id)sender {

    for (int i=3; i<=31; i++) {
        [remindarray addObject:[NSNumber numberWithInteger:i]];
         NSLog(@"no=%@",[remindarray objectAtIndex:i]);
    }

    UIViewController* popoverContent = [[UIViewController alloc]init];
    UIView* popoverView = [[UIView alloc] initWithFrame:CGRectMake(110, 0, 500, 4)];

    popoverTable = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 250, 665) style:UITableViewStylePlain];
    [popoverTable setDelegate:(id<UITableViewDelegate>)self]; 
    [popoverTable setDataSource:(id<UITableViewDataSource>)self]; 
    [self.view addSubview:popoverTable];
    [popoverTable release];

    [popoverView addSubview:popoverTable];
    popoverContent.view = popoverView;
    popoverContent.contentSizeForViewInPopover = CGSizeMake(250, 600);
    self.popoverController = [[UIPopoverController alloc]
                              initWithContentViewController:popoverContent];

    [self.popoverController  presentPopoverFromRect:CGRectMake(100,0, 535, 35) 
                                             inView:self.view permittedArrowDirections:UIPopoverArrowDirectionRight animated:YES];

    [popoverView release];
    [popoverContent release];
}

最后remind array我传递给cellForRowAtIndexPath

码:

...
cell.textLabel.text=[remindarray objectAtIndex:indexPath.row];
...

您的for循环从3开始,因此在数组中从0项开始,然后插入1项,然后尝试将该项记录在索引3处,该索引仍不在数组内

快速解决方法是

更改

NSLog(@"no=%@",[remindarray objectAtIndex:i]);

NSLog(@"no=%@",[remindarray objectAtIndex:i - 3]);

或者通过从0开始数组

另外你需要改变

cell.textLabel.text=[remindarray objectAtIndex:indexPath.row];

cell.textLabel.text=[NSString stringWithFormat:@"%@", [remindarray objectAtIndex:indexPath.row]];

因为新创建的数组索引从0索引而不是3

问题在这个循环中

for (int i=3; i<=31; i++) {
        [remindarray addObject:[NSNumber numberWithInteger:i]];
         NSLog(@"no=%@",[remindarray objectAtIndex:i]);
    }
for (int i=3; i<=31; i++) {
    [remindarray addObject:[NSNumber numberWithInteger:i]];
     NSLog(@"no=%@",[remindarray objectAtIndex:i]);
}

在这里,我从3开始,并且正在为单个对象分配提醒数组,因此起初它仅包含一个对象,因此objectAtIndex:3将为nil,因此修改代码如下

NSLog(@"no=%@",[remindarray objectAtIndex:i-3]);

要么

NSLog(@"no=%@",[remindarray objectAtIndex:0]);

我认为抛出异常的是这条线

NSLog(@"no=%@",[remindarray objectAtIndex:i]);

//
-(void)btnClick:(id)sender {
for (int i=3; i<=31; i++) {
    [remindarray addObject:[NSNumber numberWithInteger:i]];
    //your remindArray has one object, index is 0, but you are accessing the 
    //object which is at the index of 3, but the remindArray
    // has only one object [0]
     NSLog(@"no=%@",[remindarray objectAtIndex:i]);
}

解决方案很简单:您在数组的索引0处添加一个对象,然后要在索引3处打印该对象。使用:

NSLog(@"no=%@",[remindarray objectAtIndex:i - 3]);

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