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iOS Tutorial: How To Create A Simple iPhone App: Part 1/3

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1

An iOS tutorial for complete beginners that shows you how to make your first iPhone app, from scratch!

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3114-ios-tutorial-how-to-create-a-simple-iphone-app-part-1-3
2

I followed this tutorial closely, with the only exceptions being that I didnā€™t prefix my files with RWT, and I am using XCode 7.2. Iā€™ve looked over and over the example code and keep getting an error at this line:
masterController.bugs = bugs;
The stack trace reads as follows:
2016-03-09 08:29:01.206 ScaryBugs[13157:562293] -[UINavigationController setBugs:]: unrecognized selector sent to instance 0x7f80f402b000 2016-03-09 08:29:01.208 ScaryBugs[13157:562293] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UINavigationController setBugs:]: unrecognized selector sent to instance 0x7f80f402b000' *** First throw call stack: ( 0 CoreFoundation 0x0000000110332e65 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000010fda9deb objc_exception_throw + 48 2 CoreFoundation 0x000000011033b48d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x000000011028890a ___forwarding___ + 970 4 CoreFoundation 0x00000001102884b8 _CF_forwarding_prep_0 + 120 5 ScaryBugs 0x000000010f8a2ea2 -[AppDelegate application:didFinishLaunchingWithOptions:] + 1186 6 UIKit 0x00000001106d71f1 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 272 7 UIKit 0x00000001106d8397 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3415 8 UIKit 0x00000001106decc6 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1760 9 UIKit 0x00000001106dbe7b -[UIApplication workspaceDidEndTransaction:] + 188 10 FrontBoardServices 0x00000001130e0754 -[FBSSerialQueue _performNext] + 192 11 FrontBoardServices 0x00000001130e0ac2 -[FBSSerialQueue _performNextFromRunLoopSource] + 45 12 CoreFoundation 0x000000011025ea31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 13 CoreFoundation 0x000000011025495c __CFRunLoopDoSources0 + 556 14 CoreFoundation 0x0000000110253e13 __CFRunLoopRun + 867 15 CoreFoundation 0x0000000110253828 CFRunLoopRunSpecific + 488 16 UIKit 0x00000001106db7cd -[UIApplication _run] + 402 17 UIKit 0x00000001106e0610 UIApplicationMain + 171 18 ScaryBugs 0x000000010f8a455f main + 111 19 libdyld.dylib 0x0000000112a8692d start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)
Any ideas on why this happened and how I can fix it?

3

try this:

UINavigationController *nav = [splitViewController.viewControllers firstObject];
RWTMasterViewController *masterController = [nav.viewControllers objectAtIndex:0];
masterController.bugs = bugs;

the problem may be that you didnā€™t get the right view. check your Main.storyboard. in the latest version, the structure of views is quite different with what is shown in this article.

4

Hello, was wondering if you guys were able to fix this issue? Iā€™m getting an error too. But now when I tried to remove

UINavigationController *navController = (UINavigationController *) self.window.rootViewController;

with

UINavigationController *nav = [splitViewController.viewControllers firstObject];

now Iā€™m getting an error

"Unknown receiver ā€˜splitViewControllerā€™; did you mean ā€˜UISplitViewControllerā€™?

5

Hello,

Iā€™m getting a different kind of error message when creating the ScaryBugDoc.h file:

//
// ScaryBugDoc.h
// ScaryBugs
//
// Created by Pierre Binon on 2016-11-21.
// Copyright Ā© 2016 Pierre Binon. All rights reserved.
//

#import <Foundation/Foundation.h>

@class ScaryBugData;

@interface ScaryBugDoc : NSObject

@property (strong) ScaryBugData *data;
@property (strong) UIImage *thumbImage;
@property (strong) UIImage *fullImage;

  • (id) initWithTitle: (NSString *) title rating: (float) rating thumbImage: (UIImage *) thumbImage fullImage: (UIImage *) fullImage;

@end

On both lines with the @property for thumbImage and fullImage, it says "Unknown type name ā€˜UIImageā€™ā€¦ Iā€™m using Xcode 8
Any idea as to why itā€™s doing that?

Thanks for your help!

Pierre

6

The reason why it says ā€œUnkown type name ā€˜UIImageā€™ā€ is because you need to import UIKit in the scarybugdata.h file

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

7

Hello,

Managed to fix the issue ,below is the change ā†’

UINavigationController *navController = (UINavigationController *) self.window.rootViewController;

with

UINavigationController navController = [[(UISplitViewController)self.window.rootViewController viewControllers] firstObject];

8

This tutorial is more than six months old so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]