Question

I’m trying to make a scene where the user can swipe over the screen to browse between posts. The post can be both an image with text or just a note, and the view is altered depending on which one occurs.

The getting process works just perfect. It gets the right post whether i swipe right or left. The problem is that the old view wont disappear and the views are overlapping. This is especially bothering when you go from a note to a photo or vice versa since the sizes ar different…

Here’s the code:

- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@" GETRESULT %@   POSTNUMBER %d", getResult, postNumber);
Post *postInfo = [[Post alloc] init];

postInfo = [getResult objectAtIndex:postNumber];

UITextView *postText = [[UITextView alloc] init];
imgView = [[UIImageView alloc] init];

NSString *getImageString = postInfo.attachments;
if(getImageString){
    postText = [[UITextView alloc] init];
    postText.text = postInfo.noteText;
    [postText setFrame:CGRectMake(20, 320, 280, 80)];
    NSLog(@"IMG1");
}else {
    postText = [[UITextView alloc] init];
    postText.text = postInfo.noteText;
    [postText setFrame:CGRectMake(20, 10, 280, 240)];
    NSLog(@"TEXT1");
}
[self.view addSubview:postText];
SHOWHUD(self.view);
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{

        NSURL *url = [NSURL URLWithString:getImageString];
        NSData *data = [NSData dataWithContentsOfURL:url];
        UIImage *img = [[UIImage alloc] initWithData:data];
        [imgView setFrame:CGRectMake(20, 10, 280, 300)];
        [imgView setContentMode:UIViewContentModeScaleAspectFit];
        [imgView setImage:img];

    dispatch_async(dispatch_get_main_queue(), ^{   
        [self.view addSubview:imgView];
        HIDEHUD(self.view);
    });
});


UISwipeGestureRecognizer *recognizerRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeRight:)];
[[self view] addGestureRecognizer:recognizerRight];

UISwipeGestureRecognizer *recognizerLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeLeft:)];
[recognizerLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[[self view] addGestureRecognizer:recognizerLeft];

// Do any additional setup after loading the view.
}

- (void)handleSwipeRight:(UISwipeGestureRecognizer *)gestureRecognizer{
NSLog(@"SWIPE RIGHT");
if(postNumber > 0){
    postNumber--;
    Post *postInfo = [[Post alloc] init];

    postInfo = [getResult objectAtIndex:postNumber];

    UITextView *postText = [[UITextView alloc] init];
    imgView = [[UIImageView alloc] init];

    NSString *getImageString = postInfo.attachments;
    if(getImageString){
        [postText removeFromSuperview];
        postText = [[UITextView alloc] init];
        postText.text = postInfo.noteText;
        [postText setFrame:CGRectMake(20, 320, 280, 80)];
        NSLog(@"IMG1");
    }else {
        [postText removeFromSuperview];
        postText = [[UITextView alloc] init];
        postText.text = postInfo.noteText;
        [postText setFrame:CGRectMake(20, 10, 280, 240)];
        NSLog(@"TEXT1");
    }
    [self.view addSubview:postText];
    SHOWHUD(self.view);
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        if (getImageString) {

        NSURL *url = [NSURL URLWithString:getImageString];
        NSData *data = [NSData dataWithContentsOfURL:url];
        UIImage *img = [[UIImage alloc] initWithData:data];
        [imgView setFrame:CGRectMake(20, 10, 280, 300)];
        [imgView setContentMode:UIViewContentModeScaleAspectFit];
        [imgView setImage:img];
        }else {
            [imgView removeFromSuperview];
        }
        dispatch_async(dispatch_get_main_queue(), ^{   
            [self.view addSubview:imgView];
            HIDEHUD(self.view);
        });
    });
}

}

- (void)handleSwipeLeft:(UISwipeGestureRecognizer *)gestureRecognizer{
NSLog(@"SWIPE LEFT");
if(postNumber < [getResult count] - 1){
    postNumber++;

    Post *postInfo = [[Post alloc] init];

    postInfo = [getResult objectAtIndex:postNumber];

    UITextView *postText = [[UITextView alloc] init];
    imgView = [[UIImageView alloc] init];

    NSString *getImageString = postInfo.attachments;
    if(getImageString){
        [postText removeFromSuperview];
        postText = [[UITextView alloc] init];
        postText.text = postInfo.noteText;
        [postText setFrame:CGRectMake(20, 320, 280, 80)];
        NSLog(@"IMG1");
    }else {
        [postText removeFromSuperview];
        postText = [[UITextView alloc] init];
        postText.text = postInfo.noteText;
        [postText setFrame:CGRectMake(20, 10, 280, 240)];
        NSLog(@"TEXT1");
    }
    [self.view addSubview:postText];
    SHOWHUD(self.view);
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        if(getImageString){
        NSURL *url = [NSURL URLWithString:getImageString];
        NSData *data = [NSData dataWithContentsOfURL:url];
        UIImage *img = [[UIImage alloc] initWithData:data];
        [imgView setFrame:CGRectMake(20, 10, 280, 300)];
        [imgView setContentMode:UIViewContentModeScaleAspectFit];
        [imgView setImage:img];
        }else {
            [imgView removeFromSuperview];
        }
        dispatch_async(dispatch_get_main_queue(), ^{   
            [self.view addSubview:imgView];
            HIDEHUD(self.view);
        });
    });

}
}

At first i only increased postNumber and called viewDidLoad in the swipe actions. That gave me the exact same result though… This is only one of countless trial and error attempts, and I’m sorry this is among the messier ones…

Would greatly appreciate it if anyone got a solution.

Thanks in advance,
Tom

Answer 1

I couldn’t remove the variables from the superview because I did it in a new instance of viewDidLoad. I tried to do so before calling viewDidLoad this time and it worked!

Sorry for wasting your time…

Tom