I'm working on a cocoa app, in which i wanted to dynamically add, remove, resize views.
Shown above is the image, in which there are three views in a parent view out of which view-B can be added or removed and based on that we need to resize view-C.
Any cocoa/objective-c help for this.
//To add a subview
[parentView addSubview:subview];
//To remove a subview
[subview removeFromSuperview];
//To resize a view
[subview setFrameSize: NSMakeSize(width, height)];
[subview setFrameOrigin: NSMakePoint(originX, originY)];
If you need to set the frame of a view based on the size or position of other views, you can use a views frame which has a size and an origin etc...
For example, to move C so it borders A and takes up the rest of the space in the view:
NSSize size = NSMakeSize(parentView.frame.size.width, parentView.frame.size.height - a.frame.size.height);
NSPoint origin = NSMakePoint(a.frame.origin.x, a.frame.origin.y + a.frame.size.height);
[c setFrameSize: size];
[c setFrameOrigin: origin];
Related
I'm drawing a view that contains an xib, multiple times (same uiview) and then update the outlets each time it gets drawn displaying an nsmutablearray with different strings on the outlets
Clicking the view opens a viewcontroller that should be displaying the data from the view (+more), this works perfectly fine except it doesn't know which index of the array it's supposed to be displaying.
I'm trying to figure out a way to manage them in a way that I can see which view is being pressed so I can pass that 'id' onto the new vc (something to uniquely identify the view even though it's the same view being drawn)
Here's how the view is being drawn multiple times
- (void) populateUpcoming:(int)events {
[self resetVariables];
upcomingEventsCenterPos = self.view.frame.size.width / 2 - 159;
for (int i = 0; i < events; i++) {
upcomingEventsY2 = 175 * upcomingEvents2;
UIView *firstViewUIView = [[[NSBundle mainBundle] loadNibNamed:#"UpcomingEventFull" owner:self options:nil] firstObject];
[_scrollView addSubview:firstViewUIView];
CGRect frame = firstViewUIView.frame;
frame.origin.y = 9 + upcomingEventsY2;
frame.origin.x = upcomingEventsCenterPos + upcomingEventsX2;
firstViewUIView.frame= frame;
upcomingEvents2++;
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(tapUpcomingEvent:)];
[firstViewUIView addGestureRecognizer:singleFingerTap];
}
[self setupScroll];
}
I think you can use UITableView and custom UITableViewCell for this purpose. On click of "Add More", add one entry to NSMutableArray and just reload tableview.
And no need to manage index separately, you can get it directly by indexPath.row
Also you don't need to manage scroll view size as tableview automatically adjust is content height according to row.
If you are using same kind of view,then go with this approach, as its easy and will save your time.
I have some subviews that I place inside each of my tab bar's view controllers. Right now I'm sizing it with a pixel count but it only works on the iPhone 4 and 4s and not the iPhone 5 because of the longer screen size. I could check for the device and then size it that way but I feel like there has to be an easier way to do this.
viewController1.view.frame = CGRectMake(0, 0, 320, 460);
I colored the subview yellow so it's easier to see.
You should NOT change frame of tabbar's content view controller's view. UITabBar takes itself care of sizing the child view controller's frame properly.
If you want to add subview to content view controller (controller under some tab) and make that view to always automatically resize with the controllers main view (self.view), you can use combination of superviews frame and autoresizing.
Example code (you can do this in - (void)viewDidLoad for example):
UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];
view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:view];
If you want to do this by setting frame than DO this:
[childView setFrame:childView.superview.bounds];
The master view in your view controller should already be the size of the usable space on the sceen. In general, if you want a view to be the same size as it's parent, you can use view.frame = view.superview.frame, though I doubt that would be a good idea to call on the view controller's view.
I'm trying to create horizontal scroll view(s). Each view containing one image. [done]
Initially when app is opened I'd display couple of images i.e 3, so user can scroll back and forth between images. [done]
However I want to be able to go to another view controller and pick another image(s) maybe two for example and display five images in the scroll view instead of displaying 3 initially.
How would one do that? to "re-refresh" the initial scroll view ?
Update
Should I use delegate for this communication between view controllers? or how is this done?
1 main controller, other containing image selection?
This part above and much more explained by article here.(not advertising, I hope it will help someone as well).
Bounty update part 1 :
I think now that I found my way around delegates, I have additional question that I cannot find answer to, all examples I saw were about updating table views.
Bounty part 2 :
If I were to have a scrollview inside my view controller and some nsimages inside scroll view. i.e :
- (void)viewDidLoad {
[super viewDidLoad];
NSMutableArray *images = ...some images array;
for (int i = 0; i < images.count; i++) {
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * i;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];
subview.image = [images objectAtIndex:i];
[self.scrollView addSubview:subview];
}
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * images.count, self.scrollView.frame.size.height);
}
And let say my view controller implemented some delegate method didAddImage or didRemoveImage.
Meaning that about images array would get updated.
Actual bounty question :
How would one actually "tell" the view controller, O.K now your scrollview has one more image to display, please re-fresh or reload?
If I were to have a table view instead scroll view and was inserting images I'd do it something like this(in my delegate method) :
-(void) mockDelegatetablemethod:(...) ...{
[self.images addObject:image];
NSIndexPath *indexPath =
[NSIndexPath indexPathForRow:[self.images count] - 1
inSection:0];
[self.tableView insertRowsAtIndexPaths:
[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[self dismissViewControllerAnimated:YES completion:nil];
}
How would one do this to the scrollview?
Bounty update part 3:
This is "simple" case described above, naturally I'd have to support removing images also as well as if one wants to remove all images and add some new.
How would one actually "tell" the view controller, O.K now your
scrollview has one more image to display, please re-fresh or reload?
Well, you would just add the new image as a subview of the scroll view. So something like:
- (void)addImage:(UIImage*)image {
[images addObject:image];
CGRect frame;
frame.origin.x = self.scrollView.frame.size.width * images.count;
frame.origin.y = 0;
frame.size = self.scrollView.frame.size;
UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];
subview.image = image;
[self.scrollView addSubview:subview];
self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * images.count, self.scrollView.frame.size.height);
}
Or you could have a method that goes and "resets" the scroll view by removing all subviews and then re-adds all the images in your images array. Then call this method in viewDidLoad instead of your code there so that you're not duplicating code.
Basically, there's no silver bullet here. You roll your own.
You're going to need make your image scroller a class that you can tell to load up certain images. You'll need a reference to the existing image scroller, pass that pointer into your other "pick more images" controller. Then the "pick more images" controller can tell the image scroller that there is a new list of images.
This is already implemented by Apple in their iOS sample project "PhotoScroller". It has view reuse as well. They even have a WWDC 2010 video on this. I think its advanced scrollview techniques OR designing apps with scrollviews.
Shouldn't be hard to port over to mac
I'm trying to add one subview (view from an NSViewController) for every element in a dictionary to a NSScrollView to get kind of a tableview, but with much more flexibility over the cells.
Is it possible to place (programmatically) e.g. 100 subviews underneath each other so that you have to scroll down the NSScrollView to get to the last element?
The short answer is yes. I have done this before, and I assure you that it will work. Let me also assure you that it is not quite as simple as it looks ;)
The way to do this is to maintain one content view, in which you add all of your custom rows as subviews programmatically. Note that you will either have to resize the contentView before adding all of the rows, or you will have to turn off autoresizing for the row views. Set the documentView of your scrollView to this custom contentView, and you should be good to go.
Yes, simply initialize the views programmatically using (i.e.)
NSView *subView = [[NSView alloc] initWithFrame:CGRectMake(10,10,100,100)];
then add to the main using addSubview: method of the main view.
Remember to manually release the subview when you've done with it (that means, when you have added it to the main view).
As example you can do something like
int height x = 10, y = 10, width = 100, height = 100;
for(int i = 0;i<100;i++) {
NSView *subView = [[NSView alloc] initWithFrame:CGRectMake(x,y + height*i,width,height)];
[scrollView addSubview:subView];
[subView release];
}
I have an application which loads a view in it. I want to position the loaded view in 450pt of y cordinate. How to do that.
Regards
Ranjan
Look at the documentation for UIView and in particular the properties frame, bounds and center
I assume that you are adding a subview so you want it in the coordinate that is relative to the parent view. Then you use frame.
CGRect r = [subView frame];
r.origin.y = 450.0f;
[subView setFrame:r];
Something like that.