ios4

问题 Im using story boards and in the Custom Class panel of the specific view controller if i give the name of the class that contains code for that view controller i get a blank screen. What could be the problem? Ive tried everything. SO basically Class is usually UIViewController in CustomClass. I changed it to MenuScreenViewController(a ViewController objective C class that has code associated with this) and im calling it modally. Why do i get a blank screen. Urgent help please. 回答1: My guess,

问题 I can load list of pdf files(all pdf files) from Resources folder, using this code. NSArray *pdfs = [[NSBundle mainBundle] pathsForResourcesOfType:@"pdf" inDirectory:nil]; But I couldn't find a method to load list of pdf files from Documents Directory. The following line of code can only load one pdf at a time. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *file =

问题 I wonder why my app crashes when i scroll my UITableView up. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; NSArray *arrayForNames=[[NSArray alloc]initWithArray:[objContentManager getDuasNamesByGroupName:[arrayDuaGroups objectAtIndex:indexPath.section]]]; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc]

问题 I am using MFMailComposeViewController for sending the Email, With this code I am able to get the Image, But image comes after the Text Detail, I wan't First Image and after Text, Here is my code, MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init]; mail.mailComposeDelegate = self; if ([MFMailComposeViewController canSendMail]) { //Setting up the Subject, recipients, and message body. [mail setToRecipients:[NSArray arrayWithObjects:Emailid,nil]]; [mail setSubject:@

问题 I am using MFMailComposeViewController for sending the Email, With this code I am able to get the Image, But image comes after the Text Detail, I wan't First Image and after Text, Here is my code, MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init]; mail.mailComposeDelegate = self; if ([MFMailComposeViewController canSendMail]) { //Setting up the Subject, recipients, and message body. [mail setToRecipients:[NSArray arrayWithObjects:Emailid,nil]]; [mail setSubject:@

问题 I'm trying to complie my app for iOS 4. It includes Three20. I've set the base SDK to "iPhone Device 4.0" and the Deployment Target to "iPhone OS 3.0" but I get this message: "_OBJC_CLASS_$_TTURLRequestModel", referenced from: _OBJC_CLASS_$_MockPhotoSource in MockPhotoSource.o What do I have to do? 回答1: I think this thread explains most of the problems. http://groups.google.com/group/three20/browse_thread/thread/90a57d469dfcc32d/85750d0c9b7c79de?lnk=gst&q=ios4#85750d0c9b7c79de Also the

问题 Is there a way for me to get a reference to the button frames in an alertView I created? I'd like to find the position of the top button so I can use its frame to position an image directly above it. I have a couple of extra \n's at the end of my alertview text to make sure there is room to place the image, but I need to determine where that free space is in the alertview. Using the top button as a reference seems like a reliable way to find it. I have tried the following, which does return

问题 I am well into building a Core Data tab-based iPad application. I am passing in my NSManagedObjectContext to my root view using the following in my app delegate class. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.rootViewController.managedObjectContext = self.managedObjectContext; [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; return YES; } My question is: how do I set the same managedObjectContext

问题 I'm uploading videos to a web server after choosing the video using the UIImagePickerController. However, videos shot with the camera in landscapeRight orientation are inverted on the server. I want to use AVFoundation to rotate the video before uploading. I've figured out how to get the size and preferredRotation of the video using AVAsset. Now I need to apply an affine transform to the video before uploading. Here's an example of the size and transform from a landscapeRight video: 2011-01

问题 I am working on an enterprise application, where the client has the requirement of wiping all the data stored by the application, from the device, remotely. That is, in the case when a user reports a lost device. If we forget about the service side implementation of it, is it even possible to do a remote wipe of data stored in application sandbox. What about deleting files present in the application resources like sqllite files and certificates? I was browsing the net for it and came along