ios5

问题 I'm very new to iOS programming. I'm trying to set the toolbar background to a custom image. I'm also using storyboards. How do I go about that? Do I edit UIToolbar in the UI Kit framework? Do I need to change something in Storyboard? Thanks, 回答1: You can use UIToolbar 's built-in -setBackgroundImage:forToolbarPosition:barMetrics: method: // portrait [yourToolbar setBackgroundImage:[UIImage imageNamed:@"YourToolbarBkg-Portrait.png"] forToolbarPosition:UIToolbarPositionAny barMetrics

问题 I wanted to use a retina resolution image (40x40p) on a bar button item on my MVC's navigation item. When I set the image it looked stretched in horizontal direction as expected: Note I also have a toolbar button image which is in retina resolution (60px60p) as required by the Apple spec. It was similarly stretched when the size parameters had default values, i.e. width = 0, insets; t=0,b=0,l=0,r=0: However unlike the navigator item, in the toolbar case I could successfully change these

问题 I am developing an app that requires a completion block and a "barrier" functionality. As far as I know, NSOperation API has a completionBlock property and GCD API has the dispatch_barrier_(a)sync function to handle the barrier needs. What should I do in order to accomplish both of the needs? Thanks! 回答1: dispatch_group should have all the pieces you need. Just dispatch_group_async/dispatch_group_enter for your work units, then dispatch_group_notify for your completion handler. 来源： https:/

问题 I'm having a lot of trouble finding a tutorial for implementing multiple views in Xcode 4.2 without storyboard, this is for a class so I can't use storyboard yet. I'm just trying to have a 2nd view with a UIPicker come up when a button is clicked in the main view, I just can't find one for this version of Xcode and it's different enough from the older versions to confuse me. Any help appreciated if someone can give me a quick description of what I need to do this or a newer tutorial I'd

问题 Is it possible to get info of the currently playing song in the Spotify app? 回答1: Sorry, at the moment I don't believe that this functionality is possible. However, depending on the requirements of your application you could use Spotify's last.fm scrobbling to pick up the currently playing song from there instead. 来源： https://stackoverflow.com/questions/12511115/how-to-find-out-what-song-is-playing-in-the-spotify-app-on-the-iphone

问题 I'm getting an odd error. We are using iOS 5 with ARC. When NSZombiesEnabled is set to true and the app is plugged into the debugger we get this error (it happens normally too but not as consistently) 2012-07-04 11:25:17.161 Trivial[624:707] -[vcCurrentGames gamesLoaded:] [Line 284] Found 62 games that are my turn. 2012-07-04 11:25:17.162 Trivial[624:707] -[vcCurrentGames gamesLoaded:] [Line 285] Found 26 games that are their turn. 2012-07-04 11:25:17.169 Trivial[624:707] -[vcCurrentGames

问题 I've set up a delegate methos to communicate from my masterViewController to my detailViewController but the delegate method isn't getting called. MasterViewController.h #import <UIKit/UIKit.h> @class DetailViewController; @class MasterViewController; @protocol MasterViewControllerDelegate - (void)SelectionChanged:(NSString *)url; @end @interface MasterViewController : UITableViewController @property (nonatomic, weak) id<MasterViewControllerDelegate> delegate; @property (strong, nonatomic)

问题 When the user opens my app, I want to check for a value stored in the defaults, and if it is not present prompt the user to input a value. The storing/reading of the value appears to be working. -(void) viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; NSLog(@"Checking if there is an email address set"); NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSString * emailAddress = [defaults objectForKey:@"emailAddress"]; if (IsEmpty(emailAddress)) { NSLog(@"email

问题 I have a cell (videoCell) that when unselected is 100px in height, and when selected expands to 144px. In the expanded 44 pixels I have placed a toolbar (detailToolbar) through storyboard. Now here is my problem. If user interaction is enabled for the toolbar, the bar buttons work, and to simply close the cell I can just tap any of the original 100px of the cell. However, the problem arises when I'm attempting to expand a cell. If I tap the bottom 44px of the unselected cell, nothing is

问题 iTunes shows warning for in-app purchase creating Your first In-App Purchase(s) must be submitted with a new app version. Select them from the In-App Purchases section of the Version Details page and then click Ready to Upload Binary. like below screenshot : i am try lot of instruction fixing this issue but not work,i am create inapp scenario below instruction: first i am create app in iTunes connect and status is Ready to upload Binary after create manage-inapppurchase->add new->create in