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  • how to rotate the Circle in DrawRect?

    - by senthilmuthu
    HI, i want to draw a circle in DrawRect through context like pie chart(took from tutorial) thorugh UITouch? i have given the code as follows,how can i rotate ? any help please? define PI 3.14159265358979323846 define snapshot_start 360 define snapshot_finish 360 static inline float radians(double degrees) { return degrees * PI / 180; } - (void)drawRect:(CGRect)rect { // Drawing code CGRect parentViewBounds = self.bounds; CGFloat x = CGRectGetWidth(parentViewBounds)/2; CGFloat y = CGRectGetHeight(parentViewBounds)*0.55; // Get the graphics context and clear it CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextClearRect(ctx, rect); // define stroke color CGContextSetRGBStrokeColor(ctx, 1, 1, 1, 1.0); // define line width CGContextSetLineWidth(ctx, 4.0); // need some values to draw pie charts double snapshotCapacity =20; double rawCapacity = 100; double systemCapacity = 1; int offset = 5; double pie1_start = 315.0; double pie1_finish = snapshotCapacity *360.0/rawCapacity; double system_finish = systemCapacity*360.0/rawCapacity; CGContextSetFillColor(ctx, CGColorGetComponents( [[UIColor greenColor] CGColor])); CGContextMoveToPoint(ctx, x+2*offset, y); CGContextAddArc(ctx, x+2*offset, y, 100, radians(snapshot_start), radians(snapshot_start+snapshot_finish), 0); CGContextClosePath(ctx); CGContextFillPath(ctx); // system capacity CGContextSetFillColor(ctx, CGColorGetComponents( [[UIColor colorWithRed:15 green:165/255 blue:0 alpha:1 ] CGColor])); CGContextMoveToPoint(ctx, x+offset,y); CGContextAddArc(ctx, x+offset, y, 100, radians(snapshot_start+snapshot_finish+offset), radians(snapshot_start+snapshot_finish+system_finish), 0); CGContextClosePath(ctx); CGContextFillPath(ctx); /* data capacity */ CGContextSetFillColor(ctx, CGColorGetComponents( [[UIColor colorWithRed:99/255 green:184/255 blue:255/255 alpha:1 ] CGColor])); CGContextMoveToPoint(ctx, x, y); CGContextAddArc(ctx, x, y, 100, radians(snapshot_start+snapshot_finish+system_finish+offset), radians(snapshot_start), 0); CGContextClosePath(ctx); CGContextFillPath(ctx); }

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  • Bulk inserts into sqlite db on the iphone...

    - by akaii
    I'm inserting a batch of 100 records, each containing a dictonary containing arbitrarily long HTML strings, and by god, it's slow. On the iphone, the runloop is blocking for several seconds during this transaction. Is my only recourse to use another thread? I'm already using several for acquiring data from HTTP servers, and the sqlite documentation explicitly discourages threading with the database, even though it's supposed to be thread-safe... Is there something I'm doing extremely wrong that if fixed, would drastically reduce the time it takes to complete the whole operation? NSString* statement; statement = @"BEGIN EXCLUSIVE TRANSACTION"; sqlite3_stmt *beginStatement; if (sqlite3_prepare_v2(database, [statement UTF8String], -1, &beginStatement, NULL) != SQLITE_OK) { printf("db error: %s\n", sqlite3_errmsg(database)); return; } if (sqlite3_step(beginStatement) != SQLITE_DONE) { sqlite3_finalize(beginStatement); printf("db error: %s\n", sqlite3_errmsg(database)); return; } NSTimeInterval timestampB = [[NSDate date] timeIntervalSince1970]; statement = @"INSERT OR REPLACE INTO item (hash, tag, owner, timestamp, dictionary) VALUES (?, ?, ?, ?, ?)"; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, [statement UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK) { for(int i = 0; i < [items count]; i++){ NSMutableDictionary* item = [items objectAtIndex:i]; NSString* tag = [item objectForKey:@"id"]; NSInteger hash = [[NSString stringWithFormat:@"%@%@", tag, ownerID] hash]; NSInteger timestamp = [[item objectForKey:@"updated"] intValue]; NSData *dictionary = [NSKeyedArchiver archivedDataWithRootObject:item]; sqlite3_bind_int( compiledStatement, 1, hash); sqlite3_bind_text( compiledStatement, 2, [tag UTF8String], -1, SQLITE_TRANSIENT); sqlite3_bind_text( compiledStatement, 3, [ownerID UTF8String], -1, SQLITE_TRANSIENT); sqlite3_bind_int( compiledStatement, 4, timestamp); sqlite3_bind_blob( compiledStatement, 5, [dictionary bytes], [dictionary length], SQLITE_TRANSIENT); while(YES){ NSInteger result = sqlite3_step(compiledStatement); if(result == SQLITE_DONE){ break; } else if(result != SQLITE_BUSY){ printf("db error: %s\n", sqlite3_errmsg(database)); break; } } sqlite3_reset(compiledStatement); } timestampB = [[NSDate date] timeIntervalSince1970] - timestampB; NSLog(@"Insert Time Taken: %f",timestampB); // COMMIT statement = @"COMMIT TRANSACTION"; sqlite3_stmt *commitStatement; if (sqlite3_prepare_v2(database, [statement UTF8String], -1, &commitStatement, NULL) != SQLITE_OK) { printf("db error: %s\n", sqlite3_errmsg(database)); } if (sqlite3_step(commitStatement) != SQLITE_DONE) { printf("db error: %s\n", sqlite3_errmsg(database)); } sqlite3_finalize(beginStatement); sqlite3_finalize(compiledStatement); sqlite3_finalize(commitStatement);

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  • iTunes Music Store Link Maker — how to search from within my app?

    - by prendio2
    I'm writing a music reference app and for each album (pulled from last.fm) would like to link to the ITMS (if the album is in the store). iTunes link maker web tool http://apple.com/itunes/linkmaker/ is great for getting links for a known album but I need to access it programatically from within my app. This NSLog blogpost which is from 2003 but was referenced more recently in another question here seems to offer the only solution I've come across so far, suggesting to submit a query to: phobos.apple.com/WebObjects/MZSearch.woa/wa/advancedSearchResults? Put "itms://" before it and the link will work in iTunes, put "http://" before it and the link will work in Camino (Safari sometimes spits back a malformed XML error). The tags that are of importance are as follows: songTerm - song title artistTerm - artist name albumTerm - album name composerTerm - composer name term - all fields The suggestion is that would using http:// rather than itms:// the server will return an XML document of results instead of opening iTunes but either way I am sent directly to iTunes. Is it possible to get back a list of results?

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  • Ipad Magazines App How do they work?

    - by Terente Ionut Alexandru
    How are built the magazines apps? For example Popular Science, Auto Trends and PARIS MATCH I want to build an app like this. But how do these app render the content? How the app knows where is an video, an photo, scroll views and so on? Is there any library to use, and do this easy way or do I need my own engine that renders the content? Is just an webView that loads html5, css and java script or is much more than that?

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  • How do I integrate popToRootViewControllerAnimated with my tabs?

    - by Adam Storr
    Hello! I am trying to make one of my tab buttons go to the root using popToRootViewControllerAnimated. My question is: where do I put this code for it to work? I have my tabs created through Interface Builder... do they have to be hard coded for this to work? Here is the code that I'm looking to use: [self.navigationController popToRootViewControllerAnimated:YES]; New code in AppDelegate: - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { if (viewController = HomeViewController) { [HomeViewController popToRootViewControllerAnimated:NO]; } }

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  • How to ask UIImageView if MultipleTouchEnabled is "YES"

    - by Rob
    I have created a few UIImageViews programmatically, but I have a feeling that even though I setMultipleTouchEnabled to YES during the setup, it is not getting set properly and it's leading to multi-touch issues. My question is, within touchesBegan how do I go about asking the UIImageView that was touched if it has MultipleTouchEnabled or not? I am fairly new to this so I'm really stumbling through code and learning as I go (with your help of course). Thank you ahead of time!

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  • UIScrollView resizes when a UIViewController is pushed in UINavigationController. Why?

    - by user210504
    Hi! When I push a UIViewController within a UINavigationController, the UIScrollView in the view changes dimensions. Now even I am trying to resize the UIScrollView. It wont simply resize. It maintains the framework dimensions. Any idea why this would be happening. Example: My NIB has a view which has a scrollview with dimensions (320, 430) now when I push the UIViewController associated with the view the scrollview still shows dimensions has 320, 430, but is drawn much smaller then 320,430 Any suggestions in this regard.

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  • NSFetchedResultsControllerDelegate in a second view controller (not firing?)

    - by MTBPatriot
    I am running into an issue similar to the one described here: http://stackoverflow.com/questions/1319940/nsfetchedresultscontrollerdelegate-not-firing (the delegate for my NSFetchedResultsControllerDelegate are not being called on my second view controller) I can't seem to get the proposed solutions to work. I have a main view that loads information from Core Data just fine, but when it pushes a separate controller (and passes the managed object to it), the delegate methods won't fire. I've read about 'mergeChangesFromContextDidSaveNotification' but I don't understand how to synchronize the two manage objects and/or get the delegate methods to be called. Any help would be greatly appreciated. Thank you, Mike

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  • Asynchronous vs Synchronous vs Threading in an iPhone App

    - by Coocoo4Cocoa
    I'm in the design stage for an app which will utilize a REST web service and sort of have a dilemma in as far as using asynchronous vs synchronous vs threading. Here's the scenario. Say you have three options to drill down into, each one having its own REST-based resource. I can either lazily load each one with a synchronous request, but that'll block the UI and prevent the user from hitting a back navigation button while data is retrieved. This case applies almost anywhere except for when your application requires a login screen. I can't see any reason to use synchronous HTTP requests vs asynchronous because of that reason alone. The only time it makes sense is to have a worker thread make your synchronous request, and notify the main thread when the request is done. This will prevent the block. The question then is bench marking your code and seeing which has more overhead, a threaded synchronous request or an asynchronous request. The problem with asynchronous requests is you need to either setup a smart notification or delegate system as you can have multiple requests for multiple resources happening at any given time. The other problem with them is if I have a class, say a singleton which is handling all of my data, I can't use asynchronous requests in a getter method. Meaning the following won't go: - (NSArray *)users { if(users == nil) users = do_async_request // NO GOOD return users; } whereas the following: - (NSArray *)users { if(users == nil) users == do_sync_request // OK. return users; } You also might have priority. What I mean by priority is if you look at Apple's Mail application on the iPhone, you'll notice they first suck down your entire POP/IMAP tree before making a second request to retrieve the first 2 lines (the default) of your message. I suppose my question to you experts is this. When are you using asynchronous, synchronous, threads -- and when are you using either async/sync in a thread? What kind of delegation system do you have setup to know what to do when a async request completes? Are you prioritizing your async requests? There's a gamut of solutions to this all too common problem. It's simple to hack something out. The problem is, I don't want to hack and I want to have something that's simple and easy to maintain.

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  • Localization of Settings.bundle defaultvalues

    - by notnoop
    How can I have a localized default values in the Settings bundle? I encounter this problem for regionally sensitive defaults. Consider an option in the settings bundle to indicate whether to show distances in miles or kilometers. The default settings for en_US and en_GB is 'miles, and km for everywhere else. Does the SDK provide a settings for that? Or should I just add a third option: 'Infer metric system, miles, kms'

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  • Autorotation and multiple view controllers

    - by alku83
    I'm creating an iPad application which should only work in portrait and portait upsidedown modes. For performance reasons in my applicationDidFinishLaunching method I'm creating several viewControllers, and adding them to my main window as subviews. I then hide the ones I don't want to see straight away. There is no tab bar or navigation controller. My problem is that only the first viewController seems to be receiving the rotate calls. I have verified this by swapping around the order in which I add the subviews to the main window and NSLog's. Is there some way I can force all the controllers to receive the calls? Some of my views are designed to lay over the top of another view, but this behind view will not always be the same one - so it seems to make sense to have the overlay view in a separate view controller. Am I doing something fundamentally wrong, and that's why it's not behaving as I would expect? EDIT: The accepted answer for this question seems to indicate the exact problem I'm facing: http://stackoverflow.com/questions/548142/uiviewcontroller-rotate-methods

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  • Unable to load detached NIB in View

    - by Sheehan Alam
    I have two NIB's ParentViewController.xib ChildViewController.xib ParentViewController.xib contains a UIView and a UIViewController. ChildViewController.xib contains a UIButton I want ChildViewController.xib to load in the ParentViewController.xib's UIView I have done the following: Created @property for UIView in ParentViewController Connected File's Owner to UIView in ParentViewController Set UIViewController in ParentViewController's NIB Name property to ChildViewController in Interface Builder Set ChildViewController view property to UIView in ParentViewController I was hoping this would load ChildViewController into my UIView in ParentViewController but no luck. I did get the following warning, which could be the culprit: 'View Controller (Child View)' has both its 'NIB Name' property set and its 'view' outlet connected. This configuration is not supported. I also have added additional code in ParentViewController's viewDidLoad(): - (void)viewDidLoad { [super viewDidLoad]; ChildViewController *childViewController = [[ChildViewController alloc]initWithNibName:@"ChildViewController" bundle:nil]; childViewController.view = self.myView; } Any thoughts on why ChildViewController does not load in the UIView of ParentViewController?

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  • Detecting bad jpeg images

    - by Gerard Cerchio
    The question on validating jpegs on network transfer is very helpful. Could we take this question one step further? What if the image data is incomplete or corrupt from the server? The complete transport works, the MIME type is image/jpeg, the UIImage is constructed and non-nil but the renderer discovers inconsistencies in the data and the log shows "Bad Huffman code" or "premature end of data segment" How would I capture this error before tossing the UIImage into the view context and thereby getting a not-pretty image on the screen? Could I render it to a non-screen context and capture the error?

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  • Always center UIView

    - by bresc
    Hi, I have a small UIView that should appear always in the center of the screen. This works great for portrait mode but does not in landscape. To draw the UIView I use: myView.frame = CGRectMake((visibleArea.size.width - MY_VIEW_WIDTH) / 2, (visibleArea.size.height - MY_VIEW_HEIGHT) / 2, MY_VIEW_WIDTH, MY_VIEW_HEIGHT); myView.autoresizingMask = ( UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin ); Any ideas what might be missing?

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  • Executing codes in viewDidLoad

    - by iSharreth
    In my .m file : (void)viewDidLoad { [super viewDidLoad]; /* Some codes for picker view and slider */ } I used a button to navigate to second view by using the below code: (IBAction)goToPlay{ [self presentModalViewController: secondViewController animated: YES]; } I used another button to go back to first view by using below code: (IBAction)goBack{ [self dismissModalViewControllerAnimated:YES]; } Now the viewDidLoad method is not calling. I had written some codes in viewDidLoad in first view and I want to execute it when pressing goBack button in second view. What should I do? Anyone please help.

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  • View load methods not firing.

    - by 4thSpace
    I'm loading a view like this: if(commentSubmissionView == nil){ commentSubmissionView = [[CommentSubmissionController alloc] initWithNibName:@"CommentSubmissionView" bundle:nil]; } [self.view addSubview:commentSubmissionView.view]; viewDidLoad and viewWillAppear in commentSubmissionView do not fire. Is there something else I need to do?

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  • Loading a Reusable UITableViewCell from a Nib

    - by Greg Martin
    I am able to design custom UITableViewCells and load them just fine using the technique described in the thread found at http://forums.macrumors.com/showthread.php?t=545061. However, using that method no longer allows you to init the cell with a reuseIdentifier which means you have to create whole new instances of each cell at every call. Has anyone figured out a good way to still cache particular cell types for reuses, but still be able to design them in Interface Builder?

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  • AddObjectsFromArray does not work properly

    - by Sheehan Alam
    I have two NSMutableArrays: NSMutableArray* currentMessages NSMutableArray* items I am trying to copy the contents of items into currentMessages as such: [self.currentMessages addObjectsFromArray:self.items]; When I am debugging self.items contains 30 objects. After this operation self.currentMessages contains 0 objects. Why is the copy not working?

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  • EAGLView orientation changes and strange buffering

    - by Drew
    I'm writing an app that offloads some heavy drawing into an EAGLView, and it does some lightweight stuff in UIKit on top. It seems that the GL render during an orientation change is cached somewhere, and I can't figure out how to get access to it. Specifically: After an orientation change, calling glClear(GL_COLOR_BUFFER_BIT) isn't enough to clear the GL display (drawing is cached somewhere?) How can I clear this cache? After an orientation change, glReadPixel() can no longer access pixels drawn before the orientation change. How can I get access to where this is stored?

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  • What is NSString in struct?

    - by 4thSpace
    I've defined a struct and want to assign one of its values to a NSMutableDictionary. When I try, I get a EXC_BAD_ACCESS. Here is the code: //in .h file typedef struct { NSString *valueOne; NSString *valueTwo; } myStruct; myStruct aStruct; //in .m file - (void)viewDidLoad { [super viewDidLoad]; aStruct.valueOne = @"firstValue"; } //at some later time [myDictionary setValue:aStruct.valueOne forKey:@"key1"]; //dies here with EXC_BAD_ACCESS This is the output in debugger console: (gdb) p aStruct.valueOne $1 = (NSString *) 0xf41850 Is there a way to tell what the value of aStruct.valueOne is? Since it is an NSString, why does the dictionary have such a problem with it? ------------- EDIT ------------- This edit is based on some comments below. The problem appears to be in the struct memory allocation. I have no issues assigning the struct value to the dictionary in viewDidLoad, as mentioned in one of the comments. The problem is that later on, I run into an issue with the struct. Just before the error, I do: po aStruct.oneValue Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_PROTECTION_FAILURE at address: 0x00000000 0x9895cedb in objc_msgSend () The program being debugged was signaled while in a function called from GDB. GDB has restored the context to what it was before the call. To change this behavior use "set unwindonsignal off" Evaluation of the expression containing the function (_NSPrintForDebugger) will be abandoned. This occurs just before the EXC_BAD_ACCESS: NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"MM-dd-yy_HH-mm-ss-A"]; NSString *date = [formatter stringFromDate:[NSDate date]]; [formatter release]; aStruct.valueOne = date; So the memory issue is most likely in my releasing of formatter. The date var has no retain. Should I instead be doing NSString *date = [[formatter stringFromDate:[NSDate date]] retain]; Which does work but then I'm left with a memory leak.

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