Question

我正在努力开发一个让人感到满意的功能最喜欢的是工作完美但当我按下一个或上一个按钮时它的崩溃...

我不知道如何检查当前消息是否存在于FavouriteArray中？如果是Exist然后FavouriteButton图像改为Favorite-ON.png否则它的图像Favorite-OFF.png ..

我的代码低于==================

    // Adding Current Message to Favourite Array

    - (IBAction)FavouritebtnClick:(id)sender  //Favourite Button Work Perfectly 
    {

        Make_Fav_Text = [NSString stringWithFormat:@"%@",[[[TabBarTutorialAppDelegate shareDelegate].level_array valueForKey:@"SMS"] objectAtIndex:row_no]];

        NSLog(@"Make Favourite TExt====%@",Make_Fav_Text);

        [DatabaseFiles InsertFav:[NSString stringWithFormat:@"%@",Make_Fav_Text]];//insert to database

        [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-iphone.png"] forState:UIControlStateNormal];
    }

//检查当前消息在FavouriteArray中是否可用

-(void)Check_Fav_Available
{
    for (NSString *Myfav in Check_Fav_Avail)
    {
        NSLog(@"MYFAV===%@",Myfav);
        if ([Myfav isEqual:sms.text])
        {
            [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-iphone.png"] forState:UIControlStateNormal];
            NSLog(@"Found Favourite");

            //break;
        }
        else{
            NSLog(@"NOt Found");
            [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-copy-iphone"] forState:UIControlStateNormal];
        }
    }

}

//Next Button 

- (IBAction)Nextbtn:(id)sender
{


    row_no=row_no+1;
    lblno=row_no;
    lblno=lblno+1;

   [self Check_Fav_Available]; //Check Current Message in Favourite Array;

    if (row_no==[TabBarTutorialAppDelegate shareDelegate].level_array.count)
    {
        row_no=row_no-1;
//        lblno=lblno-1;
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"This is last SMS" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        NSLog(@"this is last");
        NSLog(@"row no is %d",row_no);
    }
    else
    {
        if (row_no <=4)
        {
            sms.text=[[[TabBarTutorialAppDelegate shareDelegate].level_array objectAtIndex:row_no] objectForKey:@"SMS"];
            NSString *str = [NSString stringWithFormat:@"%d - %d",lblno,[TabBarTutorialAppDelegate shareDelegate].level_array.count];
            no_lbl.text=str;

            NSLog(@"row no is %d",row_no);
           [self Check_Fav_Available];


        }
        else
        {
            UIAlertView *Purchasealert = [[UIAlertView alloc] initWithTitle:@"Purchase Category" message:@"Purchase to Enjoy More" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"Buy Message", nil];
            Purchasealert.tag=1710;
            [Purchasealert show];

            [self gostore];
            NSLog(@"this is last");
            NSLog(@"row no is %d",row_no);

        }
     }

}


//Previous Button

- (IBAction)Previousbtn:(id)sender
{

    //[FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-copy-iphone.png"] forState:UIControlStateNormal];

    row_no=row_no-1;
    lblno=lblno-1;

    if (row_no<0)
    {
        row_no=row_no+1;
        lblno=lblno+1;

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"This is First SMS" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        NSLog(@"this is last");
    } 
    else
    {
        [self Check_Fav_Available]; //Check Favourite available

        sms.text=[[[TabBarTutorialAppDelegate shareDelegate].level_array objectAtIndex:row_no] objectForKey:@"SMS"];

        NSString *str = [NSString stringWithFormat:@"%d - %d",lblno,[TabBarTutorialAppDelegate shareDelegate].level_array.count];
        no_lbl.text=str;
        [self Check_Fav_Available];

        NSLog(@"arr is %d",[TabBarTutorialAppDelegate shareDelegate].level_array.count);
        NSLog(@"row no is %d",row_no);
    }

}

Answer 1

将您的代码更改为

for (NSString *Myfav in Check_Fav_Avail){
    NSRange favRange = [Myfav rangeOfString:sms.text options:NSCaseInsensitiveSearch];

    if (favRange.location != NSNotFound) {
        NSLog(@"Found");
    } else {
        NSLog(@"Not found");
    }
}

Answer 2

试试这段代码......

-(void)Check_Fav_Available
    {

            if (!([Check_Fav_Avail indexOfObject:sms.text]==NSNotFound))
            {
                [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-iphone.png"] forState:UIControlStateNormal];
                NSLog(@"Found Favourite");

                //break;
            }
            else
              {
                NSLog(@"NOt Found");
                [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-copy-iphone"] forState:UIControlStateNormal];
            }


    }

Answer 3

用它来比较......

if ([Myfav isEqualToString:sms.text])
        {
            [FavouriteBtnChange setImage:[UIImage imageNamed:@"FAv_On-iphone.png"] forState:UIControlStateNormal];
            NSLog(@"Found Favourite");

            //break;
        }

这可能是错误的..

Make_Fav_Text = [NSString stringWithFormat:@"%@",[[[TabBarTutorialAppDelegate shareDelegate].level_array valueForKey:@"SMS"] objectAtIndex:row_no]];

相反，请使用此...

Make_Fav_Text = [NSString stringWithFormat:@"%@",[[[TabBarTutorialAppDelegate shareDelegate].level_array objectAtIndex:row_no] valueForKey:@"SMS"]];

如何检查NsmutableArray中可用的当前字符串..？

3 个答案: