ios4

问题 When the home button gets pressed I want to hide the keyboard and restore my view to a sane state, so that when the app is started/foregrounded again, there is no textfield selected and the keyboard is hidden. My app delegate has this implementation of the method: - (void)applicationDidEnterBackground:(UIApplication *)application { [tabBarController.view endEditing:YES]; } The keyboard does indeed get removed, but what I don't get is this: Apple's docs say that a snapshot of the app is taken

问题 I assume that the initWithContentURL: method is not asynchronous. I added the following methods to do the load in the background and then assign the temporary player to my variable. -(void)createPlayer { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; MPMoviePlayerController *temp = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:@"URLString"]]; [self performSelectorOnMainThread:@selector(passPlayer:) withObject:temp waitUntilDone:YES]; [temp release];

问题 Is there any way of achieving the following that avoids using "initWithData" ? (Just in case you are curious, initWithData is getting my app flagged by Apple as using an illegal API sigh ). NSData * imageData = [NSData dataWithContentsOfURL : [NSURL URLWithString : [details image]]]; picture = [[UIImage alloc] initWithData:imageData]; Many thanks, Martin 回答1: First of all, you should do this asynchronously so that your thread won't block. Here is the code for the class: @implementation

问题 I just wanted to know how I could find out the current user's country using Xcode (iPhone Dev SDK). 回答1: If you want to get the users country you can do two things. The easiest is to deciper it from their localization settings. NSLocale *locale = [NSLocale currentLocale]; NSString *country = [locale displayNameForKey:NSLocaleIdentifier value:[locale localeIdentifier]]; This can be unreliable (e.g. a user who is abroad). If you depend on the information you should use CoreLocation to find the

问题 I've been trying to rotate my view based on the CMAttitude returned from CMMotionManager specifically the pitch=x and roll=y. I'm using a reference attitude to set my horizon. This works great for portrait mode but the minute i try to do it for a landscape view it goes wrong. As the phone is now rotated 90 ccw I was hoping that coremotion would know landscape was in place and keep the pitch and roll useful. Instead I still have the axis pointing their original way. To try and compensate I

问题 I have an NSString as follows: <img alt="996453912" src="http://d2gg0uigdtw9zz.cloudfront.net/large/996453912.jpg" /><a href="http://www.dealcatcher.com/shop4tech-coupons">Shop4Tech Coupons</a> I only need the first part (before the <a href part), and I cannot figure out how to remove the second part. I have tried a ton, but it has not worked. 回答1: Use something like: NSRange rangeOfSubstring = [string rangeOfString:@"<a href"]; if(rangeOfSubstring.location == NSNotFound) { // error condition

问题 when my app starts music is playing: -(void)playBgMusic { NSString *path = [[NSBundle mainBundle] pathForResource:@"bgmusic" ofType:@"aif"]; theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; theAudio.delegate = self; [theAudio play]; } but he should be able to turn the music off by pressing a button if he presses the button again the music should turn on again. i have: -(IBAction)check { if (isquiet == NO) { [theAudio stop]; isquiet = YES;

问题 I push a view controller onto a navigation controller like this: [self.navigationController pushViewController:anotherViewController animated:YES]; And, then, inside anotherViewController I check self.navigationItem.BackBarButtonItem and LeftBarButtonItem, but they are always nil. I can see the backBarButtonItem, and it seems to work fine. 回答1: From the Documentation: "When this item is the back item of the navigation bar—when it is the next item below the top item—it may be represented as a

问题 How to handle when uitextview became first responder. I have text in text view and I want when the view became active want to clear the text. How can I do that? Thanks in advance 回答1: You can definitely use a UITextViewDelegate method of: - (BOOL)textViewShouldBeginEditing:(UITextView *)textView Just return YES and intercept inside that method. You can also do it for UITextFields with UITextFieldDelegate and: - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField Hope that helps. 回答2:

问题 I have one application in that I convert UIView in the image and send that file as an Email or an MMS. It is possible to send via Email using the addAttachmentData Method, but I can not find a similar solution for MMS. Is there an MMS solution similar to the Email solution? 回答1: There is no way to attach photos to the MMS sheet currently. Right now it is only for the Email sheet. 来源： https://stackoverflow.com/questions/4778680/attach-local-image-in-mms-in-iphone