I am trying to figure out the best way to create a view like the app details screen in the AppStore app. I want a thumbnail and text content under it that all scrolls if the content is too long. Is this done in a tableview or a scrollview?
I've made one in a scrollview. I calculated the size of each element's frame from this method:
- (CGSize)sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(UILineBreakMode)lineBreakMode
I kept a running total of the y size by adding it on after each label. At the end, if the scroll view was over a certain size (the length of my page) I gave that size to the scroll view, adding a little on the end so it wouldn't bump against the bottom.
Here's some code:
int currentYPos;
CGSize maximumSize = CGSizeMake(300, 9999);
[scrollView setCanCancelContentTouches:NO];
scrollView.indicatorStyle = UIScrollViewIndicatorStyleDefault;
scrollView.clipsToBounds = YES;
scrollView.scrollEnabled = YES;
scrollView.pagingEnabled = NO;
// set the title frame size
self.titleLabel.text = self.title;
CGSize titleSize = [self.titleLabel.text sizeWithFont:self.titleLabel.font
constrainedToSize:maximumSize
lineBreakMode:self.titleLabel.lineBreakMode];
currentYPos = titleSize.height + 20;
CGRect titleFrame = CGRectMake(10, 0, 300, currentYPos);
self.titleLabel.frame = titleFrame;
Note that many of the titleLabel properties were set on a label in IB.
Related
I have a view controller that sets up a UIImageView and a UITableView as follows in viewDidLoad:
// Root UIView
UIView *rootView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
rootView.backgroundColor = [UIColor redColor];
self.view = rootView;
// Image View
NSString *path = [[NSBundle mainBundle] pathForResource:#"test320x180" ofType:#"JPG"];
UIImage *image = [[UIImage alloc] initWithContentsOfFile:path];
self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
self.imageView.image = image;
[self.view addSubview:self.imageView];
// Table View
self.tableView = [[UITableView alloc] initWithFrame:rootView.frame style:UITableViewStylePlain];
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.tableView.contentInset = UIEdgeInsetsMake(image.size.height, 0, 0, 0);
self.tableView.contentOffset = CGPointMake(0, -image.size.height);
self.tableView.backgroundColor = [UIColor clearColor]; // so we can see the image view
[self.tableView reloadData];
[self.view addSubview:self.tableView];
There are 20 pts between the bottom of the image view, which has CGRect: (0, 0, 320, 180), and the first cell of the Table View whose origin is (0, 200), shown in red in the screen shot below.
In reveal, I see that the TableView starts 20 pts below the ImageView, screenshot below. My best guess is that the table view automatically accounts for the status bar but the image view does not.
My intention is to have the image and the first tableview cell flush, but I'm not sure how to guarantee this without adding the magic number 20 to my code.
[[UIScreen mainScreen] applicationFrame] returns a value that includes the entire height of the screen, including the height of the status bar, and always in screen coordinates.
For example on a 3.5-inch iPhone, in both portrait and landscape, you'll get the same application frame:
{ 0,0, 320, 480 } // iPhone 3.5-inch, applicationFrame in both landscape and portrait
When you assign a frame with 0 for origin.y to the image view, then add it via:
[self.view addSubview:self.imageView];
... then the self.imageView's top 20 pixels are hidden beneath the status bar.
Please note, sometimes the status bar's height is doubled, such as by a phone call, or recording audio within an app, or Personal Hotspot/tethering. To survive that, you need the value from:
CGSize size = [[UIApplication sharedApplication] statusBarFrame].size;
This is returned in Screen coordinates, so the returned rect may be:
{ 0,0, 320, 20 } // iPhone 3.5-inch, portrait
{ 0,0, 20, 480 } // iPhone 3.5-inch, landscape
{ 0,0, 320, 40 } // iPhone 3.5-inch, portrait when tethering or other phone call
{ 0,0, 40, 480 } // iPhone
So the quick solution is to use something like the above CGRect size code with the following:
CGFloat height = (size.width < size.height? size.width : size.height);
3.5-inch, landscape when tethering or other phone call
Set the size of the frame of rootView using a CGRect that is
adjusted for the status bar height, so the imageView.frame.origin.y == 0 is
not hidden by the status bar
Set imageView's frame origin y to the status bar height (which means the rootView's content is still overlapped by the status bar).
UITableView is a subclass of UIScrollView so check the contentInset property and also set the UIViewController property automaticallyAdjustsScrollViewInsets is set to NO.
I think automaticallyAdjustsScrollViewInsets applies insets to all scroll views to account for status bars, button bars and navigation bars.
I faced this same issue, while i was working in storyboard where my tableview was having same 20 pixel gap. so what you need to do is:
1.) select your view controller and in attribute inspector deselect "Adjust scroll view inset". (this will remove the gap - that tableview is presuming for navigation bar)
2.) select your tableView and in size inspector set the "section header height" == '1' (this will remove the 20 pixel gap - that tableview is presuming for status bar)
Hope will help you!
Thanks
I am attempting to create a "metro" styled UIScrollView. It is similar to how iTunes app handles panels in the new ios version which wont be named.
I can't figure out how to have my views layout/scroll so that the next view in the sequence shows up. I've tried all sorts of things like keeping the contentSize the screen width but moving each view over -10ish so it will show up like above. I've tried making scrollView whose bounds were smaller than the screen so it would show the part of the next view. Nothing works.
Here is diagram of what I'm trying to do:
It seems extremely trivial on paper but I can't seem to get it work.
I'm not sure if I'm misinterpreting your requirements - but this might be a starting point to see how you could set it up:
- (void)viewDidLoad
{
[super viewDidLoad];
CGRect viewBounds = self.view.bounds;
CGRect scrollViewFrame = CGRectMake(0, 0, floorf(CGRectGetWidth(viewBounds) / 2.2), CGRectGetHeight(viewBounds));
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:scrollViewFrame];
scrollView.center = self.view.center;
scrollView.contentSize = CGSizeMake(CGRectGetWidth(viewBounds) * 3, CGRectGetHeight(viewBounds) * 3);
scrollView.pagingEnabled = YES;
scrollView.clipsToBounds = NO;
UIPanGestureRecognizer *gestureRecognizer = scrollView.panGestureRecognizer;
[self.view addGestureRecognizer:gestureRecognizer];
for (int i = 0; i < 3; i++) {
CGRect frame = CGRectMake(10.f + (i * CGRectGetWidth(scrollView.bounds)), 10.f, CGRectGetWidth(scrollView.bounds) - 20.f, (CGRectGetHeight(scrollViewFrame) * 3) - 20.f);
UIView *view = [[UIView alloc] initWithFrame:frame];
view.backgroundColor = [UIColor redColor];
[scrollView addSubview:view];
}
[self.view addSubview:scrollView];
}
Literally just put this in an empty viewController's viewDidLoad:
The key things to note are
contentSize needs to be wide enough for all the panels
clipsToBounds should be NO so you can see the additional views
The bounds of the scrollview is essentially the main view port
pagingEnabled should be set
I've grabbed the panGestureRecognizer from the scrollview and attached it to the containing view instead so that panning is detected in the bounds of the containing view (which is larger) otherwise you are restricted to only detecting scrolls within the scrollviews bounds
Here my dilemma. I have 4 elements inside a UIScrollView.
1. Top most element is a UILabel that I give height dynamically depending upon the amount of content in it.
2. Second is a fixed height UILabel that I give position dynamically depending upon the height given to the upper UILabel
3. Third element is a UIImageView that again I have to give position dynamically depending upon the height given to the topmost UILabel
4. The fourth is a UIWebView, to which I gave both, height & position dynamically. (Height depending upon the content in it.. and position again depending on the height of topmost UILabel)
Finally, I dynamically give height to my UIScrollView to accomodate all of the above elements.
Here is the code I use in - (void)webViewDidFinishLoad:(UIWebView *)webView to accomplish all of the above.
//Adjust height of top-most UILabel
CGSize maximumLabelSize = CGSizeMake(300,9999);
CGSize expectedLabelSize = [item.label1 sizeWithFont:label1.font constrainedToSize:maximumLabelSize lineBreakMode:label1.lineBreakMode];
CGRect newFrame = label1.frame;
newFrame.size.height = 0;
newFrame.size.height = expectedLabelSize.height;
label1.frame = newFrame;
//Adjust position of second UILlabel
CGRect labelPosition = label2.frame;
labelPosition.size.height = 20;
labelPosition.origin.y = expectedLabelSize.height +14;
label2.frame = labelPosition;
//Add UIImageView and adjust it's position
UIImageView *image;
image = [[UIImageView alloc] initWithFrame:CGRectMake(0, expectedLabelSize.height +41, 320, 2)];
image.image = [UIImage imageNamed:#"image.png"];
[scrollView addSubview:image];
[image release];
//Adjust UIWebView height and position
CGRect frame = webView.frame;
frame.size.height = 0;
frame.origin.y = expectedLabelSize.height +48;
webView.frame = frame;
CGSize fittingSize = [webView sizeThatFits:CGSizeZero];
frame.size = fittingSize;
webView.frame = frame;
//Adjust Scrollview height
scrollView.contentSize = CGSizeMake(320, fittingSize.height +expectedLabelSize.height +48);
Finally, my problem is that when I first load this view, everything but the scrollview get's proper height & position. But, if I go back one view & open this view again, the scrollview has the desired height.
Any ideas what I might be doing wrong here?
My guess is that the scrollView variable isn't yet initialized when this first runs. Try setting a breakpoint somewhere in this code and checking if scrollView has a value or if it's just 0x00000000.
I have a scrollview with an image as a subview. I would like to set the boundaries of the scrollview to be the size of the image view, so that you wouldn't be able to see any of the background.
I don't want this happening anymore.
The weird part is, that after you zoom in or out on the image, then the boundaries seem to fix themselves, and you can no longer move the image out of the way and see the background.
This is what I have going for code:
-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView
{
// return which subview we want to zoom
return self.imageView;
}
-(void)viewDidLoad{
[super viewDidLoad];
[self sendLogMessage:#"Second View Controller Loaded"];
//sets the initial view to scale to fit the screen
self.imageView.frame = CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds));
//sets the content size to be the size our our whole frame
self.scrollView.contentSize = self.imageView.image.size;
//setes the scrollview's delegate to itself
self.scrollView.delegate = self;
//sets the maximum zoom to 2.0, meaning that the picture can only become a maximum of twice as big
[self.scrollView setMaximumZoomScale : 2.5];
//sets the minimum zoom to 1.0 so that the scrollview can never be smaller than the image (no matter how far in/out we're zoomed)
[self.scrollView setMinimumZoomScale : 1.0];
[imageView addSubview:button];
}
I thought that this line would solve my problem
//sets the content size to be the size our our whole frame
self.scrollView.contentSize = self.imageView.image.size;
But like I said, it only works after I zoom in or out.
EDIT: When I switch
self.scrollView.contentSize = self.imageView.image.size;
to
self.scrollView.frame = self.imageView.frame;
It works like I want it to (you can't see the background), except the toolbar on the top is covered by the image.
imageView.image.size isn't necessarily the frame of the imageView itself, try setting the
scrollview.frame = imageView.frame
and then
scrollView.contentSize = imageView.image.size
Then you won't see any border. If you want the image to be the maximum size to start with,
do
imageView.frame = image.size;
[imageView setImage:image];
scrollView.frame = self.view.frame; //or desired size
[scrollView addSubView:imageView];
[scrollView setContentSize:image.size]; //or imageView.frame.size
To fix this, I ended up declaring a new CGRect , setting its origin to my scrollView's origin, setting its size with the bounds of my view, and then assigning this CGRect back to my scrollview frame
CGRect scrollFrame;
scrollFrame.origin = self.scrollView.frame.origin;
scrollFrame.size = CGSizeMake(CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds));
self.scrollView.frame = scrollFrame;
I am struggeling with my UIScrollview to get it to zoom-in the underlying UIImageView. In my view controller I set
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
return myImageView;
}
In the viewDidLoad method I try to set the zoomScale to 2 as follows (note the UIImageView and Image is set in Interface Builder):
- (void)viewDidLoad {
[super viewDidLoad];
myScrollView.contentSize = CGSizeMake(myImageView.frame.size.width, myImageView.frame.size.height);
myScrollView.contentOffset = CGPointMake(941.0, 990.0);
myScrollView.minimumZoomScale = 0.1;
myScrollView.maximumZoomScale = 10.0;
myScrollView.zoomScale = 0.7;
myScrollView.clipsToBounds = YES;
myScrollView.delegate = self;
NSLog(#"zoomScale: %.1f, minZoolScale: %.3f", myScrollView.zoomScale, myScrollView.minimumZoomScale);
}
I tried a few variations of this, but the NSLog always shows a zoomScale of 1.0.
Any ideas where I screw this one up?
I finally got this to work. what caused the problem was the delegate call being at the end. I now moved it up and .... here we go.
New code looks like this:
- (void)viewDidLoad {
[super viewDidLoad];
myScrollView.delegate = self;
myScrollView.contentSize = CGSizeMake(myImageView.frame.size.width, myImageView.frame.size.height);
myScrollView.contentOffset = CGPointMake(941.0, 990.0);
myScrollView.minimumZoomScale = 0.1;
myScrollView.maximumZoomScale = 10.0;
myScrollView.zoomScale = 0.7;
myScrollView.clipsToBounds = YES;
}
Here is another example I made. This one is using an image that is included in the resource folder. Compared to the one you have this one adds the UIImageView to the view as a subview and then changes the zoom to the whole view.
-(void)viewDidLoad{
[super viewDidLoad];
UIImage *image = [UIImage imageNamed:#"random.jpg"];
imageView = [[UIImageView alloc] initWithImage:image];
[self.view addSubview:imageView];
[(UIScrollView *) self.view setContentSize:[image size]];
[(UIScrollView *) self.view setMaximumZoomScale:2.0];
[(UIScrollView *) self.view setMinimumZoomScale:0.5];
}
I know this is quite late as answers go, but the problem is that your code calls zoomScale before it sets the delegate. You are right the other things in there don't require the delegate, but zoomScale does because it has to be able to call back when the zoom is complete. At least that's how I think it works.
My code must be completely crazy because the scale that I use is completely opposite to what tutorials and others are doing. For me, minScale = 1 which indicates that the image is fully zoomed out and fits the UIImageView that contains it.
Here's my code:
[self.imageView setImage:image];
// Makes the content size the same size as the imageView size.
// Since the image size and the scroll view size should be the same, the scroll view shouldn't scroll, only bounce.
self.scrollView.contentSize = self.imageView.frame.size;
// despite what tutorials say, the scale actually goes from one (image sized to fit screen) to max (image at actual resolution)
CGRect scrollViewFrame = self.scrollView.frame;
CGFloat minScale = 1;
// max is calculated by finding the max ratio factor of the image size to the scroll view size (which will change based on the device)
CGFloat scaleWidth = image.size.width / scrollViewFrame.size.width;
CGFloat scaleHeight = image.size.height / scrollViewFrame.size.height;
self.scrollView.maximumZoomScale = MAX(scaleWidth, scaleHeight);
self.scrollView.minimumZoomScale = minScale;
// ensure we are zoomed out fully
self.scrollView.zoomScale = minScale;
This works as I expect. When I load the image into the UIImageView, it is fully zoomed out. I can then zoom in and then I can pan the image.