Author: doug

Need to implement Swipe to delete in your Three20 project? In order to do so, I added the 3 following methods to my datasource (TTListDataSource subclass):

– (BOOL) tableView: (UITableView *)tableView canEditRowAtIndexPath: (NSIndexPath *)indexPath {
return YES;
}

– (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Make sure the row is there to delete
if([_myModel.messages count] >= indexPath.row){
// Get the object to delete
MyObject* myObject = [[_myModel.messages objectAtIndex:indexPath.row] retain];

// Remove the object, in my case this makes an API call
[self removeObjectById: myobject.id];

// Remove the object from the array
[_myModel.messages removeObjectAtIndex:indexPath.row];

// clean up
TT_RELEASE_SAFELY(myObject);
}
// Delete the row from the UITableView
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];
}
[tableView endUpdates];
}

– (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [_myModel.messages count];
}

Note: before adding the numberOfRowsInSection method, I was getting NSInternalInconsistencyException errors.

Comments closed

Are you releasing a flashlight app for the iPhone 4 or writing an application that use the capabilities of a certain device? Apple provides a UIKit Dictionary key called UIRequiredDeviceCapabilities for this purpose.

Apple define this key as: UIRequiredDeviceCapabilities (Array or Dictionary – iOS) lets iTunes and the App Store know which device-related features an application requires in order to run. iTunes and the mobile App Store use this list to prevent customers from installing applications on a device that does not support the listed capabilities.

You set this key in the Info.plist. Here is an example which tells the App Store that your app requires a camera flash. You can use this if your app only runs on the iPhone 4:

UIRequiredDeviceCapabilities

camera-flash

More: UIKit Keys

Comments closed

I recently started seeing this error in my Cocos 2d iPhone application running on iOS 4.1:

sgx error (background gpu access not permitted):
Program received signal: “SIGABRT”.


After searching around, I found this thread on the cocos2d forum.

I modified my code in the ApplicationDelegate to look like:

– (void)applicationDidEnterBackground:(UIApplication *)application
{
[[CCDirector sharedDirector] stopAnimation];
}

– (void)applicationWillEnterForeground:(UIApplication *)application
{
[[CCDirector sharedDirector] startAnimation];
}

– (void)applicationWillResignActive:(UIApplication *)application
{
[[CCDirector sharedDirector] pause];
}

– (void)applicationDidBecomeActive:(UIApplication *)application
{
[[CCDirector sharedDirector] resume];
}

This solved my problem. I hope it helps someone else.

Comments closed