I read in this same site how to inset and UILabel (subclass UILabel and override the required methods). Before adding it to my app I decided to test it out in a standalone test app. Code is shown below.
Here's MyUILabel.h
#import <UIKit/UIKit.h>
#interface MyUILabel : UILabel
#end
Here's MyUILabel.m
#import "MyUILabel.h"
#import <QuartzCore/QuartzCore.h>
#implementation MyUILabel
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
// for border and rounding
-(void) drawRect:(CGRect)rect
{
self.layer.cornerRadius = 4.0;
self.layer.borderWidth = 2;
[super drawRect:rect];
}
// for inset
-(void) drawTextInRect:(CGRect)rect
{
UIEdgeInsets insets = {0, 5, 0, 5};
[super drawTextInRect: UIEdgeInsetsInsetRect(rect, insets)];
}
Here's my ViewController.h
#import <UIKit/UIKit.h>
#import "MyUILabel.h"
#interface ViewController : UIViewController
{
MyUILabel *myDisplay;
}
#property (strong, nonatomic) IBOutlet MyUILabel *myDisplay;
#end
Here's ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize myDisplay;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
myDisplay.text = #"Hello World!";
}
- (void)viewDidUnload
{
[self setMyDisplay:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
#end
None of the methods in MyUILabel.m (that Im overriding) get called.
Insights into why are greatly appreciated.
Regards,
Ramon.
Ok. I did some further digging and in Xcode there is a field visible when looking at the nib file. Its the 'Identity Inspector' (3rd icon from left). This needed to be changed from UILabel to MyUILabel.
Now it works!
Related
I'm very new to AVFoundation and QuartzCore development and I'm having troubles with CALayers. I'm sorry if this is a silly problem.
Here's my code:
.h
#import <Cocoa/Cocoa.h>
#import <AVFoundation/AVFoundation.h>
#import <QuartzCore/QuartzCore.h>
#interface Document : NSPersistentDocument
{
AVPlayer *player;
AVPlayerLayer *playerLayer;
NSView *playerView;
}
#property AVPlayerLayer *playerLayer;
#property AVPlayer *player;
#property IBOutlet NSView *playerView;
#end
.m
#import "Document.h"
#implementation Document
#synthesize playerView;
#synthesize player;
#synthesize playerLayer;
- (id)init
{
self = [super init];
if (self) {
}
return self;
}
- (NSString *)windowNibName
{
return #"Document";
}
- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
[super windowControllerDidLoadNib:aController];
[[aController window] setMovableByWindowBackground:YES];
// HERE the layer is nill, and I don't understand why it's not getting initialized?!
[[[self playerView] layer] setBackgroundColor:CGColorGetConstantColor(kCGColorBlack)];
}
+ (BOOL)autosavesInPlace
{
return YES;
}
#end
Any kind of help is very appreciated!
If the layer is nil, you should start by suspecting that its parent playerView is nil. Is it? If so, you probably haven't hooked up the outlet in the nib. (I see you have declared playerView as an outlet in your code, but that doesn't mean you've configured the nib correctly.)
I'm trying to be able to drag various images around using touches. So far, I'm trying to get it to work with just 1 image, but it's not working (i.e. I can't move the image with my finger). What am I doing wrong?
I have several files with the following code:
DragView.h
#interface DragView : UIImageView {
}
#end
DragView.m
#include "DragView.h"
#implementation DragView
- (void)touchesMoved:(NSSet *)set withEvent:(UIEvent *)event {
CGPoint p = [[set anyObject] locationInView:self.superview];
self.center = p;
}
#end
ViewController.h
#import <UIKit/UIKit.h>
#import "DragView.h"
#interface ViewController : UIViewController {
}
#property (nonatomic, strong) DragView *basketView;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize basketView;
- (void)viewDidLoad
{
[super viewDidLoad];
basketView = [[DragView alloc]
initWithImage:[UIImage imageNamed:#"basket.png"]];
basketView.frame = CGRectMake(140, 340.2, 60, 30);
[self.view addSubview:basketView];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Try this:
basketView.userInteractionEnabled = YES;
Documentation says that:
New image view objects are configured to disregard user events by default. If you want to handle events in a custom subclass of UIImageView, you must explicitly change the value of the userInteractionEnabled property to YES after initializing the object.
How to realize the label text dynamic change? For example,
labe.text = #"1";
the second is the :
label.text = #"2";
You can do this by extending UILabel class.
MyLable.h
#import <UIKit/UIKit.h>
#protocol MyLabelDelegate;
#interface MYLabel : UILabel
#property(nonatomic, unsafe_unretained) id<MyLabelDelegate> delegate;
#end
#protocol MyLabelDelegate <NSObject>
-(void) label:(UILabel *) label didChangeText:(NSString *) string;
#end
My label.m
#implementation MYLabel
#synthesize delegate = _delegate;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
- (void)setText:(NSString *)text{
[super setText:text];
if([self.delegate respondsToSelector:#selector(label:didChangeText:)]){
[_delegate label:self didChangeText:text];
}
}
#end
and you can implement MyLabel delegate in your view controller if want to detect change there
I am Following a tutorial at http://www.raywenderlich.com/14172/how-to-parse-html-on-ios .
Here is my detailviewcontroller.h file.
#import <UIKit/UIKit.h>
#end <-- //errors shows up here.
#interface DetailViewController : UIViewController
#property (strong, nonatomic) id detailItem;
#property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
#end
This is my detailview.m file
#import "DetailViewController.h"
#interface DetailViewController ()
- (void)configureView;
#end
#implementation DetailViewController
#pragma mark - Managing the detail item
- (void)setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}
- (void)configureView
{
// Update the user interface for the detail item.
if (self.detailItem) {
self.detailDescriptionLabel.text = [self.detailItem description];
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self configureView];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(#"Detail", #"Detail");
}
return self;
}
#end
As i referred above, the #end error message appears and wait to auto fix in red square, the i agree to do the auto fix. Then the xCode applies the #end code over there, as shown in the .h file. Then an other error appears as which is in the title " #end must appear in an objective-c context "
what should i do ?
Is xCode gone mad or what.
Whats wrong ?
In my case, somewhere along the line I missed a #end in one of the .h file. So all files that import that .h file is prompting this error. The funny thing is, I don't receive this error message on the one .h file that does miss the #end. So I guess you need to do some searching make sure you close all your #interface, #implementation or #protocol with #end. Hope that helps.
Just remove that first #end. It's completely wrong. You can only have #end after an #implementation, #interface, or #protocol declaration.
I know this is just a fundamental question but still somewhere I am missing something, I am playing with passing data to a textView from another class. For this I have created two classes one with xib file (ViewController) and another without(secondVC).
What I am trying to do is that I have a textview in ViewController class and wanted to pass the data to this textView from secondVC. This is how I am doing.
//ViewController.h
#import <UIKit/UIKit.h>
#import "secondVC.h"
#interface ViewController : UIViewController{
IBOutlet UITextView *textView;
}
#property (nonatomic, retain) UITextView *textView;
- (IBAction)go:(id)sender;
#end
//ViewController.m
- (IBAction)go:(id)sender{
secondVC *sec = [[secondVC alloc] init];
[sec print];
}
//secondVC.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface secondVC : UIViewController
- (void)print;
#end
//secondVC.m
- (void)print{
NSString *printThis = #"This works";
ViewController *vc = [[ViewController alloc] init];
[vc.textView setText:printThis];
//vc.textView.text = printThis //Tried both
}
Any suggestions would be appreciated.
Thanks
you can do like this :
//ViewController.h
#import <UIKit/UIKit.h>
#import "secondVC.h"
#interface ViewController : UIViewController{
IBOutlet UITextView *textView;
}
#property (nonatomic, retain) UITextView *textView;
- (IBAction)go:(id)sender;
#end
//ViewController.m
- (IBAction)go:(id)sender{
secondVC *sec = [[secondVC alloc] init];
sec.viewController = self;
[sec print];
}
//secondVC.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface secondVC : UIViewController {
ViewController *viewController;
}
#property(nonatomic, retain)ViewController *viewController;
- (void)print;
#end
//secondVC.m
#synthesize viewController;
- (void)print{
NSString *printThis = #"This works";
self.viewController.textView.text = printThis ;
}
Try with protocol... if you want to send string from textView(child) to other ViewController(parent)
You need a delegate method that is fired from the SecondVC and handled in the first one (ViewController).
There are a few issues here:
You've got a ViewController creating a new secondVC and sending it a print message. That's okay, but the implementation of -print creates a different instance of ViewController and tries to set the text of it's textView property. That's clearly not what you want -- you should instead be sending the text back to the original instance of ViewController.
That second instance of ViewController very likely has its textView property set to nil since textView is an outlet, but you haven't loaded its view from the .xib.
It's really not nice for one view controller to mess with the views of another view controller. The secondVC should be giving the text to the original ViewController object, not trying to set the text of one of its views.
To facilitate communication from secondVC to ViewController, give secondVC a property to keep track of the original ViewController. The usual thing to do here is to define a delegate protocol for secondVC and implement that protocol in ViewController. When ViewController creates secondVC, it sets the delegate of secondVC to itself. That gives secondVC a pointer to its delegate (it shouldn't care whether its a ViewController or some other kind of object, as long as the delegate implements the right methods).
.h file:
#import <UIKit/UIKit.h>
#protocol StringDelegate <NSObject>
-(void)getArrayOfStrings:(NSMutableArray*)strArray;
#end
#interface WWSettings : UIViewController{
}
#property(nonatomic,assign)id<StringDelegate>delegate;
#end
.m file:
#import "WWSettings.h"
#implementation WWSettings
#synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
-(void)blablablaFunction{
[delegate getArrayOfStrings:yourArray];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
#end
if you dont understand how it works .. ask ! i'll make my best to help you )
your secondVC
#import <UIKit/UIKit.h>
#import "WWSettings.h"
#interface secondVC : UIViewController<StringDelegate>{
WWSettings *obj;
}
#end
and .m file :
#import "secondVC.h"
#implementation secondVC
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
-(void)getArrayOfStrings:(NSMutableArray *)strArray{
// here you get your array !!! it's a delegate function made by you in child viewController;
}
- (void)viewDidLoad
{
obj = [[WWSettings alloc]init];
[obj setDelegate:self];
[super viewDidLoad];
// Do any additional setup after loading the view.
}
first VC .h file :
#import <UIKit/UIKit.h>
#protocol textViewChildDelegate <NSObject>
-(void)getStrings:(NSString*)string;
#end
#interface textViewChild : UIViewController<UITextViewDelegate>{
UITextView *textView;
}
#property(nonatomic,assign)id<textViewChildDelegate>delegate;
#end
.m file:
#import "textViewChild.h"
#implementation textViewChild
#synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
-(void)myWorkingMethod{
// get string from textView
[delegate getStrings:textView.text];
}
- (void)viewDidLoad
{
textView = [[UITextView alloc]initWithFrame:CGRectMake(0, 240, 320, 240)];
[super viewDidLoad];
// Do any additional setup after loading the view.
}
Now go to secondVC .h:
#import <UIKit/UIKit.h>
#import "textViewChild.h"
#interface TextViewViewController : UIViewController<textViewChildDelegate>{
UITextView * myfirstTextView;
}
#end
and to .m file:
#import "TextViewViewController.h"
#implementation TextViewViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)getStrings:(NSString *)string{
myfirstTextView.text = string; // finally we get string from child view controller
}
- (void)viewDidUnload
{
myfirstTextView = [[UITextView alloc]init];
[super viewDidUnload];
// Release any retained subviews of the main view.
}