I have the following files:
ViewController.xib
ViewController.h
ViewController.m
BannerView.xib
BannerView.h (inherits from UIView)
BannerView.m
My view controller is connected up and is working fine. I created BannerView and performed necessary linking as described in this tutorial: http://www.maytro.com/2014/04/27/building-reusable-views-with-interface-builder-and-auto-layout.html
However, in my ViewController.xib when I add a UIView and set it's class to the BannerView it just doesn't load. The app doesn't crash or anything.
Have I missed any steps, any help would be appreciated.
EDIT 1 - Added images and code
BannerView.h
#property (nonatomic, strong) IBOutlet UIView *view;
#import "BannerView.h"
#implementation BannerView
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if(self) {
[self setup];
}
return self;
}
- (void)setup {
[[NSBundle mainBundle] loadNibNamed:#"BannerView" owner:self options:nil];
[self addSubview:self.view];
}
#end
Banner View XIB - Files Owner
Banner View - View
Subclasses of UIView can't have their own XIB files. Notice when you go to create a subclass of UIView include XIB checkbox is not enabled. If you need to do custom drawing in a UIView overload drawRect. If you just want to add generic UIKit subviews to a view, do that in the XIB of the UIViewController the UIView will appear in or do it programmatically.
Related
I am using multiple XIBs/Storyboards to build my application.
I have the views laid out in the XIBs. Some have UIStackView to help organize the layout.
My main storyboard has two views embedded in a UIStackView that pulls in those views that are created with the XIBs.
Nothing will display correctly. The views are mis-sized or do not show up at all, despite displaying properly in interface builder.
My suspicion is the views are being displayed, BEFORE they are fully loaded into the view causing the frames to be different sizes.
I've been told the best practice is to give views their own Storyboard/XIB for better merging, maintenance etc... So that is what I am trying to learn.
Does anyone know the proper way to accomplish what I am doing?
Here is what I am doing:
ViewController
#import "OrangeView.h"
#import "GreenView.h"
#interface ViewController () {
OrangeView *ov;
GreenView *gv;
}
#property (weak, nonatomic) IBOutlet UIView *viewOrange;
#property (weak, nonatomic) IBOutlet UIView *viewGreen;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//Load Orange View
ov = [[OrangeView alloc] initWithFrame:_viewOrange.frame];
[_viewOrange addSubview:ov];
//Load GreenView
gv = [[GreenView alloc] initWithFrame:_viewGreen.frame];
[_viewGreen addSubview:gv];
}
Main Storyboard
OrangeView
GreenView (with multiple stackviews)
Overview
The contents of a .xib file are not "linked" to the class. That is, when you instantiate the class, that does not - by itself - also load the views and subviews you've laid out in the xib.
There are a couple ways to go about it. One method is to include the "load the elements" code inside your view class. That allows a more "conventional" approach of load/create a view instance, add as subview, set parameters (frame or constraints), etc.
Here is an example of subclassing UIView with the "xib-load" functions, and then making your actual class a sub-class of this "base":
//
// XIBViewBase.h
//
#import <UIKit/UIKit.h>
#interface XIBViewBase : UIView
#end
//
// XIBViewBase.m
//
#import "XIBViewBase.h"
#implementation XIBViewBase
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self xibSetup];
}
return self;
}
- (id)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self xibSetup];
}
return self;
}
- (void)awakeFromNib {
[super awakeFromNib];
[self xibSetup];
}
- (void)xibSetup {
// make sure we don't add the subviews more than once
if (!self.subviews.count) {
UIView *view = [self loadFromXIB];
view.frame = self.bounds;
view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self addSubview:view];
[self sendSubviewToBack:view];
}
}
- (UIView *)loadFromXIB {
// Note: the .xib file MUST be named the same as the class for this to work
NSString *className = NSStringFromClass([self class]);
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
UINib *nib = [UINib nibWithNibName:className bundle:bundle];
UIView *v = [nib instantiateWithOwner:self options:nil].firstObject;
return v;
}
#end
I put together an example of this (using your target) that you can take a look at. Might help you get a handle on it:
https://github.com/DonMag/SimpleXIB
I followed the tutorial outlined here to load a custom xib in my view controller.
The class of the xib inherits from UIView but also needs a property view:
#interface MYBannerView : UIView
#property (nonatomic, weak) IBOutlet UIView *view;
#end
I find it strange that it needs this, as its like having a view within a view which seems redundant. Is there any particular reason for this?
Edit
I followed this tutorial here which outlines this:
http://www.maytro.com/2014/04/27/building-reusable-views-with-interface-builder-and-auto-layout.html
The author of that tutorial is using the view outlet to load the view from the xib when MYBannerView is initialized programatically
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
NSString *className = NSStringFromClass([self class]);
self.view = [[[NSBundle mainBundle] loadNibNamed:className owner:self options:nil] firstObject];
[self addSubview:self.view];
return self;
}
return nil;
}
Anything created in Interface Builder will not be loaded with a programatic init. loadNibNamed loads the UI from the xib.
If you want to override initWithFrame: to load the UI elements from the xib, your init method would look something like this:
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame]; // initialize your objects
if (self) {
[[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:self options:nil]; // load your view from IB
}
return self; // return the view with all of the IB UI loaded
}
No, your UIView subclass doesn't need an outlet to the view to be functional. In fact, using self you have access to the view itself.
What about tutorial: when author added view A (let's call it so) on MYViewController's view, he set view A class to be MYBannerView. Running app won't show anything because MYBannerView xib wasn't loaded and didn't replaced content from view A. So author loads this xib in initWithCoder, set outlet using value returned by loadNibNamed: and adds view loaded from MYBannerView to view A. The process is a little bit messy but it works.
Hello StackOverflow.
I am trying to setup a UIView such that it loads itself from XIB
file in Xcode.
To do this, I went through the following initial steps:
Created empty UIView subclass.
Added a blank XIB file.
Then, I added all the subviews I wanted into the XIB file, and made corresponding IBOutlet Properties inside the UIView Subclass.
I watched this video to show me how to properly connect the outlets and set the files owner. The video instructs me to do the following things:
Do not set the UIView class to your subclass in XIB. Time link
Set the File's Owner to your UIView subclass in XIB:Time Link
Insert a IBOutlet into your UIView class of type UIView so your XIB file can load into that.Time link
Override initWithCoder like (image) if you intend to initialize the custom UIView within another XIB file.
Override initWithFrame like (image) if you intend to initialize the custom UIView programatically within another class file.
Cool, I have done all of these things, and am choosing to initialize my UIView programatically.
See my UIView subclass implementation file:
#import "CXHostsTableViewCellContentView.h"
#implementation CXHostsTableViewCellContentView
#pragma mark Custom Initializers
-(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
[[NSBundle mainBundle]loadNibNamed:#"CXHostsTableViewCellContentView" owner:self options:nil];
[self setBounds:self.view.bounds];
[self addSubview:self.view];
}
return self;
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self)
{
[[NSBundle mainBundle]loadNibNamed:#"CXHostsTableViewCellContentView" owner:self options:nil];
[self addSubview:self.view];
}
return self;
}
And of course, my header file:
#import <UIKit/UIKit.h>
#import "CXStyleView.h"
#interface CXHostsTableViewCellContentView : UIView
#pragma mark UIView Properties
#property (strong, nonatomic) IBOutlet UIView *view;
#property (nonatomic,weak)IBOutlet UIView *standardView;
#end
I also have an image here of the XIB file's owner and another of the IBOutlet link from the base UIView to the outlet on file's owner.
Right, so everything's looking pretty good, should be no problem running this right?
Nope, whenever I initialize this subview and present it, I get a crash:
CXHostsTableViewCellContentView *scrollContentView = [[CXHostsTableViewCellContentView alloc]init];
I've really got no idea how to solve this, as I'm sure I'm following all of these steps right. I've googled and come across this question which has the same symptoms, but the answer has identical code to what I'm using, and this question with a contradictory reply.
I'm not sure what to do at this point, or what is causing the crash. I know that if I have NO outlets linked at all, it works. But then again, nothing displays either.
I think that You will face Problem When You Allocate Memory to Your scrollContentView object.
so,Try To allocate Memory With Frame.
i.e
Write this in .m file
- (void)myAllocation {
//do your stuff
}
- (id)initWithFrame:(CGRect)aRect {
self = [super initWithFrame:aRect];
if (self) {
[self myAllocation];
}
return self;
}
- (id)initWithCoder:(NSCoder*)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self myAllocation];
}
return self;
}
...
CXHostsTableViewCellContentView *scrollContentView = [[CXHostsTableViewCellContentView alloc] initWithFrame:CGRectMake(0, 10, 0, 20)];
I have a storyboard driven iOS application.
My objective is to add a small square view (defined as other XIB) to another UIView which is on main ViewController.
*// Please note that, I have assigned the Class names in Identity Inspector correctly*
On the main ViewController, I added a UIView (myHolderView) manually and added a UIView member in the ViewController interface.
//.h
#interface ViewController : UIViewController
#property(nonatomic, strong) IBOutlet UIView *myHolderView;
#end
And, I have connected this IBOutlet by "BlueString" :)
Now, I have added another XIB with single view - Called it MySquare.xib and added a label on it.
And, added a UIView class with a .h and .m files. And, "BlueString" connections are made.
#interface MySquare : UIView
#property(nonatomic, strong) IBOutlet UILabel *myLabel;
#end
Now, in the implementation:
#implementation ViewController
#synthesize myHolderView;
- (void)viewDidLoad
{
[super viewDidLoad];
MySquare *sq=[[MySqure alloc]init];
// Do any additional setup after loading the view, typically from a nib.
[self.myHolderView addSubview:sq];
}
When I run it in the simulator, it just shows the main view, but on it the square view is not coming.
I know that main view had loaded because... I changed the colour of it so that I could see.
Please help.
Probably you don't do in your MySquare.m file the view initialisation using your xib.
- (id) initWithFrame:(CGRect)frame {
NSLog(#"This is called if you add programatically this view");
self = [super initWithFrame:frame];
if (self) {
[self addSubview:[[[NSBundle mainBundle] loadNibNamed:#"MyIBView" owner:self options:nil] objectAtIndex:0]];
}
return self;
}
If you plan to add your xib using Interface Builder, you have to implement similarly the initWithCoder method:
-(id)initWithCoder:(NSCoder *)aDecoder {
if ((self = [super initWithCoder:aDecoder])) {
[self addSubview:[[[NSBundle mainBundle] loadNibNamed:#"MyIBView" owner:self options:nil] objectAtIndex:0]];
}
return self;
}
Plese go through in this checklist, it might help others too:
Checklist adding a custom view with Interface Builder layout (xib):
1) create a new xib (File->New->IOS/User Interface->View), name it (eg. MyIBView)
2) create a new class (File->New->IOS/Cocoa Touch->Objective-C class), make sure it is a Subclass of UIView! Name it MyIBView.
Now you have MyIBView.xib, MyIBView.h and MyIBView.m files added to your project
3) Edit your MyIBView.xib: select the File's owner and using the Identity inspector (3rd icon) select Class you created recently, MyIBView.
4) Select the top level View (if its a new xib, only this exists) and make sure using the Identity inspector that the Class is UIView (grey) and not overwritten
5) Now you can add IBOutlets and/or IBActions to your MyIBView.h file and you can do connections using Interface Builder in your MyIBView.xib
Using this view programatically in another view:
6a) Create the first method (initWithFrame) above in your MyIBView.m file if you would like to use this custom view programatically
7a) include your MyIBView.h file where you would like to add your custom view programatically
8a) now you can add your view:
MyIBView *myIBView = [[MyIBView alloc] initWithFrame:CGRectMake(0,0,100,100)];
Using this view in Interface Builder in another view:
6b) Create the second method (initWithCoder) above in your MyIBView.m file if you would like to use this custom view in Interface Builder
7b) In your another view drop an UIView to your view canvas. Adjust the size and modify the Class using the Identity inspector to MyIBView.
Please note that you cannot see design time your custom view, only after trying to run the code.
Hope it helps, and you can find your miss-configuration!
I have a UIView called baseViewand in that I have initWithFramewhere I add some other views and do some custom stuff. The same view also has a NIB file.
Now I have a UIViewController class named AppController in which I want to add the baseView view to the view of the AppController view so I am doing this:
self.view = baseView; but the problem is that the NIB file does not get loaded. How do I make sure the customized stuff AND the NIB file get´s loaded/run?
You have many options, depending on how your "baseView" class is meant to be used and integrated in to your application. It's not clear just how you intend to use this class -- as the view in a UIViewController subclass, or as a reusable modular component mean to be instantiated multiple times throughout your application, for use in many different view controllers.
If your view is meant to be the only view in a UIViewController subclass, then Phonitive is correct -- bundle it together with the UIViewController subclass .xib file and use the UIViewController's viewDidLoad to do final initialization.
But if you want your View class to be a subcomponent reused multiple times in different view controllers, integrated either via code or via inclusion in a .xib file for another controller, then you need to implement both the initWithFrame: init method, and awakeFromNib, to handle both cases. If your internal initialization always includes some objects from .xib, then in your initWithFrame you'll need to load your .xib manually in order to support "customer" classes that want to create your widget via code. And likewise, if a .xib file contains your object then you'll need to make sure you call any code-required finalization from awakeFromNib.
Here's an example of how to create a UIView subclass component with the UI design in a nib.
MyView.h:
#interface MyView : UIView
{
UIView *view;
UILabel *l;
}
#property (nonatomic, retain) IBOutlet UIView *view;
#property (nonatomic, retain) IBOutlet UILabel *l;
MyView.m:
#import "MyView.h"
#implementation MyView
#synthesize l, view;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
// Initialization code.
//
[[NSBundle mainBundle] loadNibNamed:#"MyView" owner:self options:nil];
[self addSubview:self.view];
}
return self;
}
- (void) awakeFromNib
{
[super awakeFromNib];
// commenters report the next line causes infinite recursion, so removing it
// [[NSBundle mainBundle] loadNibNamed:#"MyView" owner:self options:nil];
[self addSubview:self.view];
}
- (void) dealloc
{
[l release];
[view release];
[super dealloc];
}
Here's what the nib file looks like (except that file's owner needs to be changed to MyView class).
be sure to hook up both the view and label outlets to File's Owner. That's it! A template for creating re-usable UIView widgets.
The really neat thing about this structure is that you can place instances of your MyView object in other nib files, just place a UIView at the location/size you want, then change the class in the identity inspector (CMD-4) to MyView, and boom, you've got an instance of your widget in whatever views you want! Just like UIKit objects you can implement delegate protocols so that objects using your widget can be notified of interesting events, and can provide data to display in the widget to customize it.
I found this post after having a problem trying to do this in my app. I was trying to instantiate the view from a NIB in the ViewDidLoad method, but the controls acted as if they were disabled. I struggled with this trying to directly set the userInteractionEnabled property and programmatically set the touch event selector for a button in this view. Nothing worked. I stumbled upon another post and discovered that viewDidLoad was probably too soon to be loading this NIB. I moved the load to the ViewWillAppear method and everything worked. Hope this helps someone else struggling with this. The main response was great and works well for me now that I have it being called from the proper place.
if you want to use a NIB, it's better for your UIView to be linked with a UIViewController, in this case you can use
UIViewController *vc=[[UIViewController alloc] initWithNibName:#"YourNIBWihtOUTEXTENSION" bundle:nil]
[self.view addSubView:vc.view ];
becareful of memory leaks, you have to release vc
If you have a custom UIView with a xib file.
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
id mainView;
if (self)
{
NSArray *subviewArray = [[NSBundle mainBundle] loadNibNamed:#"HomeAllAdsView" owner:self options:nil];
mainView = [subviewArray objectAtIndex:0];
}
return mainView;
}
- (void) awakeFromNib
{
[super awakeFromNib];
}
This post helped me Building Reusable Views With Interface Builder and Auto Layout. The trick had to do with setting the IBOutlets to the FileOwner and then adding the content view to itself after loading the nib