I have a viewcontroller which contains an instance variable containing a dictionary object with a bunch of data. The view is fairly complex and contains several subviews that i instantiate and embed from seperate view files(To avoid having a thousand lines of UI code in the actual viewcontroller) - But how do these subviews, which exists in their own files, get access to my dictionary object from the viewcontroller?
So when im editing the DescriptionView.m file - How do i get access to the contents of the locationData dictionary object from the ViewController?
Hope you understand what i mean.
Here's a snippet from the ViewController:
CaseViewController.h
#import "DescriptionView.h"
#interface CaseViewController : UIViewController {
NSDictionary *locationData;
DescriptionView *descriptionView;
}
#property (nonatomic, retain) NSDictionary *locationData;
#property (nonatomic, retain) DescriptionView *descriptionView;
#end
CaseViewController.m
- (void)loadView {
UIView *view = [[UIView alloc] init];
descriptionView = [[DescriptionView alloc] initWithFrame:CGRectMake(0, 130, 320, 237)];
descriptionView.hidden = NO;
[view addSubview:descriptionView];
self.view = view;
[view release];
}
Ideally you should never access any properties of viewcontroller from the view.
The main idea of MVC architecture is that viewcontroller tells it's views what to render and not vise versa.
So you just have to provide all the data that your view needs for rendering during it's initialization:
- (void)loadView {
UIView *view = [[UIView alloc] init];
descriptionView = [[DescriptionView alloc] initWithFrame:CGRectMake(0, 130, 320, 237) paramDict: self.locationData]; descriptionView.hidden = NO;
[view addSubview:descriptionView];
[descriptionView release]; // BTW add this line here (or in dealloc) or you'll have a leak
self.view = view; [view release];
}
If you need to update your view dynamically, then you should add some methods to your view and call them from viewcolnroller.
E.g.:
DescriptionView.m:
-(void) updateWithDict:(NSDictionary*) udict;
If you need to perform some actions when some button in DescriptionView is pressed (or any other user interaction) a good idea would be declaring a protocol like DescriptionViewDelegate (or smth like that):
-(void) descriptionViewButton1Pressed:(DescriptionView*) dview;
-(void) descriptionViewButton2Pressed:(DescriptionView*) dview;
then make your CaseViewController a delegate and implement that methods there.
The simpliest way to have a reference to its viewcontroller from a view is to extend UIView:
#interface MyView: UIView {
UIViewController *mViewController;
}
Then in loadView
MyView *view = [[MyView alloc] init];
view.mViewController = self;
Related
I have a UIView designed in XIB file. Basically with a navigation bar and a button to close the UIVIew. I want to show this UIView in several UIViewControllers across the app.
Below is the code I have imp[emnted so far.However the UIView doesn't show up.
My ViewControllers are designed in storyboard however I needed a simple UIView that is why I created a new custom subclass of UIView alongwith a xib file of the same name.The File's Owner is also set to custom subclass. What else is required here?
#interface BottomSlidingView : UIView //this is my UIView
{
}
#implementation BottomSlidingView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setUserInteractionEnabled:YES];
NSLog(#"Bottom View Loaded"); //I get this log entry but the view doesn't showup.
}
return self;
}
- (BOOL)loadMyNibFile {
if (![[NSBundle mainBundle] loadNibNamed:#"BottomSlidingView" owner:self options:nil]) {
return NO;
}
return YES;
}
And this is how I call the custom UIView in my UIViewController.
-(void)shareButton:(UIBarButtonItem *)button
{
NSLog(#"share button clicked");
BottomSlidingView *bsv = [[BottomSlidingView alloc] initWithFrame:CGRectMake(20, 480, 280, 420)];
[bsv loadMyNibFile];
[self.view insertSubview:bsv belowSubview:self.optionsToolBar]; //this toolbar is a subview that I am adding to this view controller.
}
I see a couple problems with your approach:
Create the view instance from a nib file, rather than instantiating it with initWithFrame:. For example (if the custom view is the only root-level object in the nib file):
+ (instancetype)bottomSlidingView
{
return [[[UINib nibWithNibName:#"BottomSlidingView" bundle:nil] instantiateWithOwner:nil options:nil] lastObject];
}
Implement awakeFromNib or initWithCoder: instead of initWithFrame: (which isn't called when loading from nibs) in your UIView subclass.
In your view controller, you would use something like the following to create the view:
- (void)shareButtonPressed:(id)sender
{
BottomSlidingView *slidingView = [BottomSlidingView bottomSlidingView];
[slidingView setFrame:CGRectMake(20, 480, 280, 420)];
[[self view] insertSubview:slidingView belowSubview:[self optionsToolBar]];
}
Hope that helps.
Where ever you want to reuse a UIView of a UIViewController in another view controller you need to use this....
YourViewController * child = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:nil];//View controller of view , you want to reuse
[self.view addSubView:child.YourView]; //YourView = Name of view, you want to reuse
[self addChildViewController:child];
[child release];
After adding childViewController All IBActions will be work in child.
And after removing this view You have to remove YourViewController from parentViewController other wise there will be memory issues.......
I am trying to change views when I swipe. I have the swipe working find as I have tested this by changing the background color.
Since then however I have added a new view.nib and set the class to be the same as the current view.
Inside this classes .h file I have done this
#interface MasterViewController : UIViewController <UIGestureRecognizerDelegate>{
UIView *myView;
UIView *secondView;
}
#property (strong, nonatomic) IBOutlet UIView *myView; // attached to Viewcontroller nib
#property (strong, nonatomic) IBOutlet UIView *secondView; // attached to the secondView
- (void)swipedScreen;
MyView is the main view that appears first, secondView is the view of the nib that I have created and changed its class to relate to this view.
From there I have done this in the .m file
- (void) setupSwipeGestureRecognizer {
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(swipedScreen)];
swipeGesture.direction = (UISwipeGestureRecognizerDirectionRight|UISwipeGestureRecognizerDirectionLeft);
[myView addGestureRecognizer:swipeGesture];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
self.title = #"Prototype";
[self setupSwipeGestureRecognizer];
}
- (void)swipedScreen
{
// Not sure what to do here.
[[NSBundle mainBundle] loadNibNamed:#"SecondView" owner:self options:nil];
}
I just dont know what to do in swipedScreen method to get the secondView to appear.. I would like to animate this view to slid in from the right.. but at the moment that comes secondary to actually just getting the view to appear... not sure what I am doing wrong here but obviously its something quite fundamental.
any help would be greatly appreciated.
As I commented:
- (void)swipedScreen
{
[UIView animateWithDuration:3.0f delay:0 options:UIViewAnimationOptionCurveLinear
animations:^{
secondView.frame = CGRectMake(180, secondView.frame.origin.y, secondView.frame.size.width, secondView.frame.size.height);
}
completion:^(BOOL finished){
myView.hidden = YES;
}];
}
Actually, you'll have to change the X, Y, Width and height values as you want to animate, and when it's completed, I set the main view - myView - hidden.
I'm attempting to load a Modal View Controller (1st) from a Modal View Controller (2nd). While it sounds complicated, it probably isn't.
The 1st controller is actually a UIWebView which is initialized in the loadView method of the .m file:
- (void)loadView {
// Initialize webview and add as a subview to LandscapeController's view
myWebView = [[[UIWebView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] autorelease];
//CGRect forceframe = CGRectMake(0, 0, 480, 320);
//myWebView = [[[UIWebView alloc] initWithFrame:forceframe] autorelease];
myWebView.scalesPageToFit = YES;
myWebView.autoresizesSubviews = YES;
myWebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
myWebView.delegate = self;
self.view = myWebView;
}
Then in viewDidLoad:
- (void)viewDidLoad {
[super viewDidLoad];
// Load HTML file as an NSURL request
[self.myWebView loadHTMLString:updated_html baseURL:nil];
// Invoke the covering modal view on condition
if (some_condition) {
landscapeCoverController = [[UIViewController alloc] initWithNibName:#"LandscapeCoverController" bundle:[NSBundle mainBundle]];
[self presentModalViewController:landscapeCoverController animated:YES];
[landscapeCoverController release];
}
The intended 2nd Modal View Controller (landscapeCoverController) is initialized with a NIB that I set up in IB.
My intended objective, is to conditionally cover up the UIWebView with the "LandscapeCoverController" view, which will have some buttons and interactivity which will result in the 2nd Modal View being dismissed.
Why isn't my landscapeCoverController loading? Any thoughts greatly appreciated!
Also...the 1st Modal View controller (LandscapeViewController) .h looks like:
#class LandscapeCoverController;
#interface LandscapeViewController : UIViewController <UIWebViewDelegate> {
UIWebView *myWebView;
LandscapeViewController *landscapeCoverController;
}
#property (nonatomic, retain) UIWebView *myWebView;
#property (nonatomic, retain) LandscapeViewController *landscapeCoverController; // Modal view controller
and...the 2nd Modal View controller (landscapeCoverController) viewDidLoad does nothing:
// NIB initialized in LandscapeViewController.m viewDidLoad:
- (void)viewDidLoad {
[super viewDidLoad];
}
as I think the
landscapeCoverController = [[UIViewController alloc] initWithNibName:#"LandscapeCoverController" bundle:[NSBundle mainBundle]];
[self presentModalViewController:landscapeCoverController animated:YES];
[landscapeCoverController release];
statement should handle initialization and loading of the controller...
You are declaring landscapeCoverController as an instance of LandscapeViewController, and allocating it as a UIViewController. This is most likely your problem (probably the first one, as you aren't calling any methods specific to LandscapeViewController). Also, since landscapeCoverController is an instance variable, you don't really need to release it after presentModalViewController. Try to pick more dissimilar class names. It will save you from confusion like this in the future.
In my viewbased application i loaded oneview as mainview and another view as subview of mainview. Its work well the code snippet is ,
In mainviewcontroller,
IBOutlet UIView *subView;
#property(nonatomic,retain) UIView *subView;
#synthesize subView;
[subView release];
//add subview
[self.view addSubview:subView];
//removefromsubview
[subView removeFromSuperview];
This code works fine.....
I dont want to create subview in mainviewcontroller, so i created a new UIView class and its named as subView, now i deleted all declarations of subView from mainviewcontroller and just import subView class in mainviewcontroller. And using this [self.view addSubview:subView];
This things not work great. Can anyone help me ... How can i interact a separate UIView class with UIViewcontroller.One more thing is that UIView class have labels and textboxes can i set values from UIViewController to UIView labels and textboxes ......
Is it possible ?
Thanks in advance.......Sorry for my bad english
You have a sub-class called Subview which is declared as a UIView, i.e.
#interface Subview : UIView {
UILabel *foo;
}
#property (nonatomic, retain) UILabel *foo;
#end
Now you want to use this sub-class inside of your main UIView, which you had from the start. There are a few things you need to do.
#import the Subview in your header file, and add an instance of it to your class.
#import "Subview.h"
and inside of your #interface's {}'s,
Subview *mySubview;
In the viewDidLoad class for your main view controller, around the bottom, add something like:
mySubview = [[Subview alloc] init];
[self.view addSubview:mySubview];
[mySubview release];
First line will allocate a new "Subview" for you, second line will add this to your view so you get the stuff it has, and third line will release it. It's okay to release it here, because "self.view" will now be responsible for it, so it won't vanish.
Lastly you need to set the view up in the init method for Subview. In Subview.m, do something like:
- (id)init
{
if (self = [super init]) {
foo = [[UILabel alloc] init];
foo.text = #"Hello!";
[self addSubview:foo];
}
return self;
}
And I think that should take care of it. You also want to release foo in -dealloc for Subview but you probably know how to do that stuff already.
EDIT: This question is due to a big lack of understanding how Interface Builder and properties in classes works.
Why can't i just set self.mySubView = anoterhView; like one can set self.view = anotherView; ?
## .h
#interface TestController : UIViewController {
IBOutlet UIView *mySubView;
}
#property (nonatomic, retain) IBOutlet UIView *mySubView;
##.m
#implements TestController
#synthesize mySubView;
- (void)viewDidLoad {
AnotherController *anotherController = [[AnotherController alloc] initWithNibName:nil bundle:nil];
anotherView = anotherController.view;
// if i do
self.view = anotherView;
// result: replaces whole view with anotherView
// if i instead do
self.mySubView = anotherView;
// result: no change at all
// or if i instead do:
[self.mySubView addSubview:anotherView];
// result: mySubView is now displaying anotherView
}
NOTE: I'm using interfacebuilder. I'm sure everything is hooked up allright because self.view, and self.mySubView addSubview: is working allright..
To make it automatically appear on your self.view you need to overwrite your setter method, e.g.:
- (void)setMySubView:(UIView *)view {
[mySubView removeFromSuperview]; // removing previous view from self.view
[mySubView autorelease];
mySubView = [view retain];
[self.view addSubview: mySubView]; // adding new view to self.view
}
mySubview is a property which is a reference to an UIView object. So when you assign an UIView object to it, you are merely changing what mySubview is referring to and no more as in this case,
self.mySubview = anotherView;
The original UIView object that mySubview was referring to is still referred to within view's subviews property. Nothing changes.
But when you add anotherView as a subview of mySubview, anotherView belongs to the view hierarchy and is displayed on screen. So this works.
view (parent of) mySubview (parent of) anotherView
However when you assign anotherView directly to the view, You not only change the UIView object view was referring to but it also adds itself to the parentView. This is handled by UIViewController.
self.view = anotherView;
Your setCurrentView should be more or so like this,
- (void) replaceSubview:(UIView *)newView {
CGRect frame = mySubview.frame;
[mySubview removeFromSuperview];
self.mySubview = newView;
[self.view addSubview:newView];
newView.frame = frame;
}
As a response to what #beefon said. This works kind of as expected, but background-color is transparent. It doesen't respond either... buttons do not get pressed etc..
- (void)setCurrentView:(UIView *)newView {
/* 1. save current view.frame: CGRect mySubViewFrame = [mySubView frame];
2. remove and put new subview - I have wrote how to do it
3. set new frame for new view: [mySubView setFrame:mySubViewFrame]; */
CGRect currentViewFrame = [currentView frame];
[currentView removeFromSuperview];
[currentView autorelease];
currentView = [newView retain];
[self.view addSubview:currentView];
[currentView setFrame:currentViewFrame];
}
Your instance variable needs to be a property in order to use the dot. syntax, use:
#Property (nonatomic, retain) IBOutlet UIView* subview;
in the header, and use:
#synthesize subview;
in the main file.
In order to set a UIView using the dot. syntax you need to make it a property. This also allows you to set the subview's properties outside the class.