I was wondering which way is prefer for declaring an IBOutlet in a subview?
#property (weak, nonatomic) IBOutlet UITableView *mTableView;
or
IBOutlet UITableView *mTableView;
I believe the first one is better, but not too sure.
The first one is the better. Consider this : If you use the assistance editor and you Ctrl + Drag a view item straight into the code file, it will add it exactly like that
#property (weak, nonatomic) IBOutlet UITableView *mTableView;
Related
Iam a newbie in iOS Development.
outlets are displayed in intellisense on .m file if i type first characters but i want to see only list of outlets in intellisense like listing only methodnames of object .
Is there a way to list only outlets in intellisense when i want?
Do i always have to switch to .h file to see the list of outlets?
.h file outlets
#property (weak, nonatomic) IBOutlet UIImageView *searchImage;
#property (weak, nonatomic) IBOutlet UIButton *searchbutton;
#property (weak, nonatomic) IBOutlet UILabel *mainLabel;
#property (weak, nonatomic) IBOutlet UICollectionView *collectionView;
#property (weak, nonatomic) IBOutlet UIActivityIndicatorView *activityIndicator;
Use this line in .m file after implementation
#synthesize searchImage,searchbutton,mainLabel,activityIndicator;
To access them just write their name and use it
[activityIndicator stopAnimating];
mainLabel.text = #"ss";
When I run my iOS simulator, I get this error:
UITableViewController loadView loaded the I1u-ML-mqb-view-QFc-WC-CU4 nib but didn't get a UITableView.'
My code:
#interface IF2000 : UITableViewController
#property (weak, nonatomic) IBOutlet UILabel *EnterCategory;
#property (weak, nonatomic) IBOutlet UITextField *Tfield;
- (IBAction)Submit:(id)sender;
#property (weak, nonatomic) IBOutlet UITableViewCell *EmptyCell;
#end
This is the only code that I have typed so far. If anyone knows how to solve this problem, I would appreciate the help. If I could get a general answer on how to solve this problem, that would be good as well.
Your nib file contains a view other than a table view as the first object. When you try to load a UITableViewController with a nib, you must make sure to have a table view as the first object.
so I'm writing Obj-C for iOS, and something "strange" is happening..
I have an MVC, with a UITableView (private):
#interface MVC ()
#property (strong, nonatomic) IBOutlet UITableView *tableView;
#property (strong, nonatomic) CellVC *cell1;
#property (strong, nonatomic) CellVC *cell2;
#end
I load the table view up with a few custom cells. My custom cell class is actually a UIViewController... so I instantiate a few, and set cell.contentView to the corresponding CellVC.view inside the tableView:cellForRowAtIndexPath: method. My custom cell class:
#interface CellVC : UIViewController
#property (strong, nonatomic) IBOutlet UIKnob *knob1;
#property (strong, nonatomic) IBOutlet UIKnob *knob2;
#property (strong, nonatomic) IBOutlet UIKnob *knob3;
#property (strong, nonatomic) IBOutlet UIKnob *knob4;
#end
In case you're wondering, I've written a subclass of UIControl named UIKnob...
In CellVC's viewDidAppear: method, I've set a breakpoint to check the values of every knob. Each knob is non-nil, so I am happy... they have all been created.
My goal is to set MVC as the delegate of each knob. (4 knobs for each cell)
If I set a breakpoint anywhere in MVC, the value of each knob is nil??...
cell1.knob1.delegate = self;
will not work because the knobs only exist inside CellVC.m ...
Any ideas??
I get the famous loaded the "MyController" nib but the view outlet was not set error. However I made sure, that the IBOutlet view is set.
Once the exception is thrown I hit a breakpoint. Below you can see that
All IBOutlets are connected
All IBOutlets are set
When unfolding UIViewController super-class, I can see that _view is 0x00000000 and obviously causes this exception.
Code (header)
#interface InfoDialogViewController : UIViewController
#property (strong, nonatomic) id episode;
#property (strong, nonatomic) NSString *identifier;
#property (strong) IBOutlet UIView *regularSide;
#property (strong) IBOutlet UIView *flippedSide;
#property (weak) IBOutlet UIImageView *episodeCover;
#property (weak) IBOutlet UITextView *episodeTitle;
#property (weak) IBOutlet UITextView *episodeSummary;
- (IBAction)flip:(id)sender;
#end
Some notes
The xib file contains three UIViews on its root level (Flipped, Regular, View)
InfoDialogViewController.m file doesn't contain any methods (I don't do any funky by overriding)
I am using this Controller in combination with addChildViewController.
Anybody has an idea what happens here and how I can fix it? Does ARC play some tricks on me?
Please check:
1. The Class for your View Controller's View should be UIView
2. File owner should be your View Controller
3. Right CLick on File Owner, your view Outlet should be set.
If it is already solved, can u mention what solved your issue?
I have a view controller alertForNeedsClassification as a property in another class, as such:
#interface SCAAppDelegate()
{
HomeScreenViewController * _homeScreenViewController;
NSInteger SCAStatus;
}
#property (strong, nonatomic) PromptClassifyViewController * alertForNeedsClassification;
#end
#implementation SCAAppDelegate
#synthesize alertForNeedsClassification;
#synthesize window = _window;
PromptClassifyViewController's interface looks like this:
#interface PromptClassifyViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *headerTitle;
#property (weak, nonatomic) IBOutlet UITextView *message;
#property (weak, nonatomic) IBOutlet UIButton *notNowButton;
#property (weak, nonatomic) IBOutlet UIButton *classifyButton;
#property (weak, nonatomic) IBOutlet UIImageView *backgroundImageView;
#property (weak, nonatomic) IBOutlet UIView *alertView;
#property NSUInteger tag;
#property (weak, nonatomic) IBOutlet id<PromptClassifyViewControllerDelegate> delegate;
- (void)show;
- (void)showFromView:(UIView *)view;
- (IBAction)show:(id)sender;
- (IBAction)dismiss:(id)sender;
- (IBAction)buttonWasPressed:(id)sender;
- (void)setHeaderTitleWithText:(NSString *)text;
#end
I am trying to change the values of IBOutlets message and headerTitle text, like this:
alertForNeedsClassification = [[PromptClassifyViewController alloc] initWithNibName:#"PromptClassifyViewController" bundle:nil];
//[alertForNeedsClassification setDelegate:self];
self.alertForNeedsClassification.headerTitle.text = #"A title";
alertForNeedsClassification.message.text = #"A message";
Then I show alertForNeedsClassification calling a show method (it's like a custom uialertview, but it doesn't subclass from uialertview).
Thing is, no matter how I change it, the text on alertForNeedsClassification.view is always that which is defined in the nib, ie. I can't change it programmatically.
My custom alert view is based on Jeff LaMarche's design: http://iphonedevelopment.blogspot.com/2010/05/custom-alert-views.html
Any ideas what might be going on?
Please be careful when you allocate and initialize the UIView object, especially if you trying to mix using Nib and dynamically generating objects. The best place is within -(void)awakeFromNib or -(void)viewDidLoad
Also, make sure these methods are called. By using -(id)initWithNibName:bundle: only cannot make sure your view to be loaded. Try -(void)addChildViewController and -(void)addSubview: on parentViewController's view to make sure view is loaded after being initialized.
If the text had to be prepared before being loaded, assign it to separate NSString property within PromptClassifyViewController class. Since this property is independent from view being loaded, you can change it's value BEFORE view is appeared. Make sure this text is used and applied to the headerTitle within -(void)show method.
Since you allocate PromptClassifyViewController and access weak referenced headerTitle from self. alertForNeedsClassification, make sure it's not deallocated right afterward.
Usually, weak option is not used for IBOutlet properties. Though it is used when generating outlet connection code by dragging objects from Interface Builder. Try testing your code using strong.
I was assigning values to the IBOutlets before they were alloc'd/initialized. The solution I implemented was to set the values I needed to non-IBOutlet properties (NSStrings in this case) and assign those where needed, in Prompt...Controller's viewDidLoad;