• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 913
  • Last Modified:

Using XCode and Cocoa Touch - How do find info on debugging and implementing classes properly for iPhone?

I'm relatively new to development in XCode and Interface Builder for iPhone.  I've developed a little with C# in .NET for work.
I'm wanting to know a systematic approach to debugging and using classes properly in development.

For example, I'm writing an app, and I'm wanting to use a class I haven't implemented before, UIWebView.  I used the apple developer documentation in XCode to learn how to use it, but I've not been able to get a page running in the UIWebView yet.  The simulation runs without warnings or errors, but nothing loads in the UIWebView.

How I should go about solving this sort of problem?  What should I read, or what debugging steps should I take to get the UIWebView, or any class implemented properly?

I could post my code, but I more concerned about the proper steps to solving this type of issue rather than just to solve this example.
0
mattasks
Asked:
mattasks
  • 4
  • 4
2 Solutions
 
pgnatyukCommented:
You need to show the code. I attached an example that you may understand already.
Any question you have, you can simply ask here.

Here is a tutorial about UIWebView:
UIWebView Tutorial
http://www.iphonesdkarticles.com/2008/08/uiwebview-tutorial.html

It's simple and works fine. It will take you few minutes to read and implement this program.

There is a debugger in Xcode. It's not the same as in Visual Studio and it will take a while to understand it and start to use it. Command + backslash set a breakpoint. You can use NSLog and it will help you to develop. The log messages you will see in the console. Actually you need to arrange the IDE per your needs. For now, simply use the Xcode menu and Google search for everything.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
  
	CGRect webFrame = CGRectMake(0.0, 0.0, 320.0, 460.0);
	UIWebView *webView = [[UIWebView alloc] initWithFrame:webFrame];
	[webView setBackgroundColor:[UIColor whiteColor]];
	NSString *urlAddress = @"http://www.google.com";
	NSURL *url = [NSURL URLWithString:urlAddress];
	NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
	[webView loadRequest:requestObj];
	[window addSubview:webView]; 
	[webView release];	
    [window makeKeyAndVisible];
	
	return YES;
}

Open in new window

0
 
mattasksAuthor Commented:
I'm asking about the steps to solve this type of problem.  For example, if your code above compiled fine, returned no errors or warnings, but the UIWebView wouldn't load a page (just stayed as the plain whiteColor background), what steps would you take to debug it?  Where would you put brakepoints and what would you be looking for in an inspector?
Thanks
0
 
mattasksAuthor Commented:
I've done a few applications, and have mostly used tutorials and examples to help debug.  But I'm looking for a better practice to use when I can't find examples.  What are some systematic checks that I should do when this sort of problem occurs?
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
pgnatyukCommented:
1. Use NSLog for each step.
2. Set a breakpoint new NSString *urlAddress = @"http://www.google.com"; and check the variables and function returns. In may cases you can check everything in Mac OS X application. The change is simple AppKit instead of UIKit.
0
 
pgnatyukCommented:
For such mistakes you use NSLog and debugger.
Xcode contains instruments for more complicated cases: memory leak detection, profiling, etc.
0
 
mattasksAuthor Commented:
Ok, thanks for those suggestions.  I'm becoming more familiar with the debugger now.
I'm trying to use breakpoints and NSLog within viewDidLoad in the view controller, but I can't get the debugger to stop at the breakpoints.  NSLog doesn't seem to write to the console either.  (I've got NSLog working successfully in another method)

- (void)viewDidLoad:(id)sender {
      NSLog(@"inside viewDidLoad override");
      [super viewDidLoad];
}

Any ideas?
0
 
mattasksAuthor Commented:
Thanks for the help.  This has helped me start using the debugger and Console.  I have more questions, but I'll start them in new questions so that I can award the points for this solution first.

Thanks,
Matt
0
 
pgnatyukCommented:
You are welcome
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 4
  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now