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BOOK: Beginning iOS 4 Application Development
This is the forum to discuss the Wrox book Beginning iOS 4 Application Development by Wei-Meng Lee; ISBN: 978-0-470-91802-9
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  #1 (permalink)  
Old July 14th, 2011, 11:23 PM
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Default Ch. 3 - Using the Web View - UsingViews2

New to mobile apps but not new to programming...ran into first significant problem as stated in the title.

Loading the project into the simulator
- app begins to appear (in other words the screen looks as I expect)
- no web page appears
- app disappears (without action by me) and the empty simulator 'desktop' appears with Safari and Photos icons, as well as the icon for UsingViews2

UsingViews2ViewController.h
---------------------------------
Code:
#import <UIKit/UIKit.h>
@interface UsingViews2ViewController : UIViewController {
	IBOutlet UIWebView *webView;
}
@property (nonatomic, retain) UIWebView *webView;
@end
UsingViews2ViewController.m
---------------------------------
Code:
#import "UsingViews2ViewController.h"
@implementation UsingViews2ViewController
@synthesize webView;
- (void) viewDidLoad {
	NSURL *url = [NSURL URLWithString:@"http://www.apple.com"];
	NSURLRequest *req = [NSURLRequest requestWithURL:url];
	[webView loadRequest:req];
	[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
	// Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
	// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
	// Release any retained subviews of the main view.
	// e.g. self.myOutlet = nil;
}
- (void)dealloc {
	[webView release];
    [super dealloc];
}
@end
- UIWebView placed in the View
- webView connected to the UIWebView via ctrl-click and drag 'File's Owner' to View-UIWebView and selecting webView

Any ideas?

Thx
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  #2 (permalink)  
Old July 14th, 2011, 11:59 PM
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Default

The error is not in your code, so it must be in the Interface. When the app crashes are you getting any messages in the console?

I would recheck the .xib . If you can't locate the problem, send the project to
ipadhelper@me.com

and I should be able to spot it.

Bob
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Old July 15th, 2011, 10:03 AM
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Thank you. Console output below - this makes sense because when I ctrl-drag from the File's Owner to the View, I get a popup with both 'Webview' (the name of the Web View in the interface) and 'view' (and I don't know what this is). I've been connected to 'Webview'. So the 'view' is not connected but I don't know what the 'view' is or where it came from.
----------------

2011-07-15 07:57:36.845 UsingViews2[16438:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] loaded the "UsingViews2ViewController" nib but the view outlet was not set.'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dc75a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f1b313 objc_exception_throw + 44
2 CoreFoundation 0x00d7fef8 +[NSException raise:format:arguments:] + 136
3 CoreFoundation 0x00d7fe6a +[NSException raise:format:] + 58
4 UIKit 0x00369709 -[UIViewController _loadViewFromNibNamed:bundle:] + 295
5 UIKit 0x00367134 -[UIViewController loadView] + 120
6 UIKit 0x0036700e -[UIViewController view] + 56
7 UIKit 0x002dad42 -[UIWindow addRootViewControllerViewIfPossible] + 51
8 UIKit 0x002da22d -[UIWindow _setHidden:forced:] + 303
9 UIKit 0x002da01d -[UIWindow _orderFrontWithoutMakingKey] + 50
10 UIKit 0x002d8cd1 -[UIWindow makeKeyAndVisible] + 39
11 UsingViews2 0x000022d2 -[UsingViews2AppDelegate application:didFinishLaunchingWithOptions:] + 135
12 UIKit 0x002b7c89 -[UIApplication _callInitializationDelegatesForURL:payload:suspend ed:] + 1163
13 UIKit 0x002b9d88 -[UIApplication _runWithURL:payload:launchOrientation:statusBarSty le:statusBarHidden:] + 439
14 UIKit 0x002c4617 -[UIApplication handleEvent:withNewEvent:] + 1533
15 UIKit 0x002bcabf -[UIApplication sendEvent:] + 71
16 UIKit 0x002c1f2e _UIApplicationHandleEvent + 7576
17 GraphicsServices 0x0171f992 PurpleEventCallback + 1550
18 CoreFoundation 0x00da8944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FU NCTION__ + 52
19 CoreFoundation 0x00d08cf7 __CFRunLoopDoSource1 + 215
20 CoreFoundation 0x00d05f83 __CFRunLoopRun + 979
21 CoreFoundation 0x00d05840 CFRunLoopRunSpecific + 208
22 CoreFoundation 0x00d05761 CFRunLoopRunInMode + 97
23 UIKit 0x002b97d2 -[UIApplication _run] + 623
24 UIKit 0x002c5c93 UIApplicationMain + 1160
25 UsingViews2 0x00002228 main + 102
26 UsingViews2 0x000021b9 start + 53
)
terminate called after throwing an instance of 'NSException'
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Old July 15th, 2011, 10:15 AM
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There should be 2 outlets in the File's Owner in UsingViews2ViewController.xib, a 'view' outlet and a 'webView' outlet. The webView is embedded in a UIView. Make sure the view outlet is connected to the UIView and the webView is connected to the UIWebView. The first connection should have already been made when the template was loaded. (it is not something you should have had to connect) Maybe somehow it was disconnected.

Bob
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Old July 15th, 2011, 11:09 AM
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Default

That did it. Somehow the view outlet got disconnected from the UIView. I fixed it and this works perfectly now.

I'm not understanding outlets yet but making progress.

Thank you very much for pointing me in the right direction.
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