I have a subclassed UIView with a special behavior.
It is a custom class of a ViewController xib view. It contains a subview, which is currently created programmatically.
My question is; how to pass a subview either from the xib or from one created programmatically in the viewController via initWithFrame or initWithCoder to my subclassed view? (Right now it simply acts through the view, not initiated at all in the VC.)
I would share code, but I don't know that it's necessary.
Use the initWithFrame method:
SubclassedView *view = [[SubclassedView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[self.view addSubview:view];
Be sure to import #import "SubclassedView.h"
Related
I'm kinda new to iOS development.
I want to have a custom View and some Labels inside it. And In some viewControllers of my app on a button click I want to add/show that View
at the bottom of that viewController.
As far as I'm manually adding the view in storyboard in all the viewControllers in which I want the view to display. But this is not efficient. How can I add this view in viewControllers programmatically on button click?
Make one BaseViewController class inherited with UIViewController
Now create method named as designFooter in BaseViewController
func designFooter() {
var viewFooter: UIView = UIView(frame: CGRectMake(0, self.view.bounds.size.height - 50, self.view.bounds.size.width, 50))
viewFooter.backgroundColor = UIColor.redColor()
self.view!.addSubview(viewFooter)
}
For Swift 4, 5.1:
func designFooter() {
let viewFooter: UIView = UIView(frame: CGRect(x:0, y:self.view.bounds.size.height - 50, width:self.view.bounds.size.width, height:50))
viewFooter.backgroundColor = UIColor.red
self.view.addSubview(viewFooter)
}
Now inherit this BaseViewController to you ViewController where you want to add footer, and on button click just call self.designFooter()
If this subview you want to add has some dynamic content or has much of its own logic, you might want to employ view controller containment, specifically not only add a subview, but add a controller associated with that subview, too. So, you can have a scene in your storyboard for this subview that will appear on the bottom, and associate it with its own view controller. Then, when you want to add it, you'd do something like:
let child = storyboard!.instantiateViewController(withIdentifier: "storyboardid")
addChild(child)
// set the `frame` or `constraints` such that it is in the correct place, perhaps animating it into place
view.addSubview(child.view)
child.didMove(toParent: self)
And when you want to remove it:
child.willMove(toParent: nil)
child.view.removeFromSuperview()
removeChild(child)
Personally, if this can really appear and disappear from any scene in my app I actually embed the whole app in a container view controller. Then this popping of the child in and out only has to be done once, on this master container view controller.
For example, consider this storyboard:
That is an embedded "container view" (the storyboard equivalent of view controller containment, discussed above). And I can then have a label animate in an out (by animating layoutIfNeeded after changing the height constraint of some view with a label). Then, this bottom view can animate in and out regardless of which view controller's view is currently visible:
Just create a UIView and call addSubview:
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0,0,100,100)];//change this frame for your purposes
UILabel *l = [[UILabel alloc] initWithFrame:CGRectMake(10,10,50,10)];
[l setText: #"My label"];
[view addSubview: l];
[self.view addSubview: view];
As far as adding this to multiple view controllers... I suppose if you had a lot of different view controllers with this same UIView you could create a subclass of UIViewController called CustomViewController. In that class add the above code to viewDidLoad. Then, subclass CustomViewController in all the view controllers with this particular view, and they will automatically add it for you.
Edit:
If you want to design the view in interface builder, make a custom subclass of UIView. Let's call this CustomView. Design it in a nib and add any code you want. Then, whenever you want to create that view, simply call CustomView *cv = [[CustomView alloc] initWithFrame:...] and then do [self.view addSubview:cv];
I have designed a UIView in storyboard and the parent view is a tableview. But I want to set it hidden or unhidden depend on my decision.How can I do?
Get the view by tag? Or any other method？
I put up the code:
UIView *myview=[[UIView alloc] viewWithTag:99];
myview.hidden=true;
But it does not work!
Give the IBOutlet to the UIView in storyboard
#property(nonatomic, weak)IBOutlet UIView *subView;
In the ViewDidLoad or ViewWillAppear
put this line
subView.hidden=YES;
You should replace this line UIView *myview=[[UIView alloc] viewWithTag:99];
with
UIView *myview = [self.view viewWithTag:99];
if you have added on the main view and then try setting the view hidden.
Try writing this code in viewDidAppear.
i've tried to create a custom view which works like a bottom bar and it worked
Right now this function is required on multiple classes, so i try writing it into a new class and import it which likes:
//BottomBarLauncher.h
#import <UIKit/UIKit.h>
#interface bottomBarLauncher : UIViewController
-(void)launchBottomBar;
#end
And implement it as :
//BottomBarLauncher.m
-(void) launchBottomBar{
for (UIView *subView in [topView subviews]) {
[subView removeFromSuperview];
}
UIView *btnBarView = [[UIView alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height - 53.3, 320, 53.3)];
btnBarView.backgroundColor = [UIColor redColor];
[self.view addSubview:btnBarView];
}
Now here's the problem, while i try implement it on a new view like follows:
//NewView.m
#import "BottomBarProtocol.h"
#interface NewView()
{
BottomBarLauncher *btnBar;
}
#end
//blahblahblah
[btnBar launchBottomBar];
and nothing happens, i think the problem was with
[self.view addSubview:btnBarView];
but i have no idea how to select the current view as target which i can add subview onto.
First a suggestion, looking at your requirements/code I think you want to create custom view. For creating a custom view, create a class which inherits from UIView rather than creating a UIViewController.
Now moving to the code, your btnBar is a UIViewController which has its own view self.view so when you call this [btnBar launchBottomBar] internally you are adding the bottom bar on self.view that is your btnBar controllers view and not on NewView controllers view. Hope you understand what I am pointing out.
Here you are missing out few calls,
btnBar.view.frame = CGRectMake(0,self.view.bounds.size.height-40,self.view.bounds.size.width,40); // Add suitable frame.
//This call will add the btnBar's view as subview onto your current view controller's view.
[self.view addSubView:btnBar.view];
This is not correct/recommended way and you can face serious challenges regarding memory leaks. To avoid those mistakes, as I suggested, create a custom UIView instead. Take a look around on how to create custom views.
Hope that helps!
You can return the UIView form launchBottomBar method and add as a subView in your current ViewController class
Make custom class and delegate and add that view in window and set its frame so that it is not visible and set its frame and slide from bottom when needed so you can use it in all view controller.
Thanks.
I want to show my own custom UIView in storyboard. By far I have done following but my custom view is not showing up.
Dragged and dropped a UIView instance in my screen.
Defined the class for this UIView as my custom class.
Have connected this UIView with an IBOutlet in my view controller.
I even tried with below code in viewWillAppear.
self.myView = [[MyCustomView alloc] initWithFrame:frame];
This works if I create an instance of my custom view and add as a subview to my IBOutlet property for my view. So, below code is working but I want to keep track of only my IBOutlet iVar and do not want to play with another object for changes on my custom view:
self.myExtraView = [[MyCustomView alloc] initWithFrame:frame];
[self.myView addSubview:self.myExtraView];
Any idea how to do this in a better way so that I could have just one reference of my custom view and could change properties on it as per will.
Found the issue. With storyboard we must initialize anything in initWithCode method. I was implementing the regular init method.
How do I change the order of views displayed, when the two views I want to rearrange are not related?
I am trying to work on someone else's code, and they have a class which is a subclass of UITableViewController. I want to put a background in, so I put it as a subview of self.view .
The problem is, it's displayed in front of the table, and the table is located as self.tableView, not self.view.tableView . Since the two views aren't together, I can't use the sendSubviewToBack method.
self is the viewController class I'm working on.
Any ideas?
UIImageView *background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"editInfoBG.png"]];
background.frame = CGRectMake(0, 0, 320, 416);
[self.view addSubview:background];
// Doesn't work, the table is not a subview of self.view
[self.view sendSubviewToBack:background];
If you want to add subviews into your viewcontroller, you should use a subclass of UIViewController with manually added UITableView as subview and implementing the UITableViewDataSource and UITableViewDelegate protocols instead of using UITableViewController.
you can insert the background before the tabeview like this
[self.view insertSubview:background belowSubview:self.tableView.view];