I read a post describing a SIGABRT issue with this same chapter in the same book, but I have a different one. I have typed the following code, and the app won’t run doe to a SIGABRT issue in the main.m file. Would anyone know what issue I am having? any help would be appreciated! Thanks!
code:
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// create and configure the UTWindow instance
// A CGRect is a struct with an origin (x, y) and a size
// (width, height)
CGRect winFrame = [[UIScreen mainScreen] bounds];
UIWindow *theWindow = [[UIWindow alloc] initWithFrame:winFrame];
self.window = theWindow;
// Define the frame rectangles of the three UI elements
// CGrectMake() creates a CGRect from (x, y, width, height)
CGRect tableFrame = CGRectMake(0, 80, winFrame.size.width, winFrame.size.height - 100);
CGRect fieldFrame = CGRectMake(20, 40, 200, 31);
CGRect buttonFrame = CGRectMake(228, 40, 72, 31);
// Create and configure the UITableView instance
self.taskTable = [[UITableView alloc] initWithFrame:tableFrame
style:UITableViewStylePlain];
self.taskTable.separatorStyle = UITableViewCellSeparatorStyleNone;
//Tell the table view which class to instantiate whenever it needs to create a new cell
[self.taskTable registerClass:[UITableViewCell class] forCellReuseIdentifier:@“Cell”];
// Create and configure the UITextField instance where new tasks will be entered
self.taskField = [[UITextField alloc] initWithFrame:fieldFrame];
self.taskField.borderStyle = UITextBorderStyleRoundedRect;
self.taskField.placeholder = @“Type a task, tap Insert”;
// Create and configure the UIButton instance
self.insertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.insertButton.frame = buttonFrame;
// Give the button title
[self.insertButton setTitle:@“Insert”
forState:UIControlStateNormal];
// Add our three UI elements to the window
[self.window addSubview:self.taskTable];
[self.window addSubview:self.taskField];
[self.window addSubview:self.insertButton];
// Finalize the window and put it on the screen
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
Tell us what you get if you run only with this bare-bones code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
CGRect winFrame = [[UIScreen mainScreen] bounds];
UIWindow *theWindow = [[UIWindow alloc] initWithFrame:winFrame];
self.window = theWindow;
// Application windows are expected to have a root view controller
self.window.rootViewController = [UIViewController new];
CGRect buttonFrame = CGRectMake (228, 40, 72, 31);
// Create and configure the UIButton instance
self.insertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.insertButton.frame = buttonFrame;
[self.window addSubview:self.insertButton];
// Give the button title
[self.insertButton setTitle:@"Insert" forState:UIControlStateNormal];
// Finalize the window and put it on the screen
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
Note how the above code differs from yours by this additon:
// Application windows are expected to have a root view controller
self.window.rootViewController = [UIViewController new];
Thanks for the quick reply. I added the following:
// Application windows are expected to have a root view controller
self.window.rootViewController = [UIViewController new];
Into the appropriate section of code, and now the application will run without the SIGABRT issue and will display the view as it is displayed in the book, but the text field will not let me type in it. It is behaving as if it is an image in the view instead of a text field. The keyboard doesn’t show up either.
Here is my code now: @implementation AppDelegate
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Create and configure the UIWindow instance
// A CGRect is a struct with an origin (x, y) and a size (width, height)
CGRect winFrame = [[UIScreen mainScreen] bounds];
UIWindow *theWindow = [[UIWindow alloc] initWithFrame:winFrame];
self.window = theWindow;
// Application windows are expected to have a root view controller
self.window.rootViewController = [UIViewController new];
// Define the frame rectangles of the three UI elements
// CGRectMake() creates a CGRect from (x, y, width, height)
CGRect tableFrame = CGRectMake(0, 80, winFrame.size.width, winFrame.size.height - 100);
CGRect fieldFrame = CGRectMake(20, 40, 200, 31);
CGRect buttonFrame = CGRectMake(228, 40, 72, 31);
// Create and configure the UITableView instance
self.taskTable = [[UITableView alloc] initWithFrame:tableFrame
style:UITableViewStylePlain];
self.taskTable.separatorStyle = UITableViewCellSeparatorStyleNone;
// Tell the table view which class to instantiate whenever it needs
// to create a new cell
[self.taskTable registerClass:[UITableViewCell class] forCellReuseIdentifier:@“Cell”];
// Create and configure the UITextField instance where new tasks
// will be entered
self.taskField = [[UITextField alloc] initWithFrame:fieldFrame];
self.taskField.borderStyle = UITextBorderStyleRoundedRect;
self.taskField.placeholder = @“Type a task, tap Insert”;
//Create and configure the UIButton instance
self.insertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.insertButton.frame = buttonFrame;
// Give the button a title
[self.insertButton setTitle:@“Insert” forState:UIControlStateNormal];
// Add our three UI elements to the window
[self.window addSubview:self.taskTable];
[self.window addSubview:self.taskField];
[self.window addSubview:self.insertButton];
// Finalize the window and put it on the screen
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
(void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
(void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
(void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
(void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
(void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}