Introduction Objective-C is a powerful programming language used to develop applications for Apple’s iOS and Mac OS X operating systems. It is an object-oriented language that allows developers to create complex applications with relative ease. One of the most important aspects of Objective-C is the ability to use a boolean value from one class in … Read more
Normally you would use a webservice (via SOAP, REST, JSON, …) for such tasks, as this would prevent opening the database-server to the public and also makes you independent from the used programming language. 2 solved iPhone application Getting data from Mysql database
You’re right — unless your reason for running in the background fits within one of the categories that Apple has defined (playing audio, voip, etc.), your app won’t be allowed to run indefinitely in the background. If the reason you want to do that is really compelling, you might want to talk to Apple about … Read more
For Saving Username and Password I will personally suggest to use Keychain as they are more safer than NSUserDefault in terms of security since Keychain stores data in encrypted form while NSUserDefault stores as plain text. If you still want to use NSUserDefault Here’s the way FOR SAVING NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; // saving … Read more
You can inherit from RLMObject class and put the NSString into your RLMObject as a property. Then you can make new RLMObject one more time, with a RLMArray of previously made RLMObject now. @interface StringObject: RLMObject @property NSString *stringValue; @end @interface RealmObject: RLMObject @property RLMArray<StringObject> *realmArray @end After this manipulation feel free to use it. … Read more
Likely it is a memory management issue. Are you abiding by rules set out in the Memory Management Programming Guide? Try: revising the memory management rules, make sure you are not using any objects that you don’t own, make sure you are retaining objects you want to keep (and releasing them appropriately afterwards); running your … Read more
You need to use pow method of math.h from C-language. antilog = pow(10, number) ; This will give you antilog of number by base10 Side Note: As you are creating a Scientific Calculator and you would be needing Base for the number. EDIT: double number=74.5; double logOfNumber=log10(number); double antilog = pow(10, logOfNumber) ; NSLog(@”%lf”,antilog); Output: … Read more
Look into DSP, (Digital signal processing). This won’t come easy as it does get rather complicated (ever heard of a Fourier transform?). Start by trying to make something react to audio first as you will learn a lot about how to do what you want to do. tl;dr: there is no magic way to do … Read more
A couple of thoughts: You’re written a method, MysetValue which is a bit redundant. When you synthesized your columNumber property, it writes a setter method for you, setColumNumber, that does this for you. Don’t write your own setter if you don’t need to. If you have a property, columNumber that you’ve defined in your .h, … Read more
Use UICollectionView 1) Inefficient way : If you want to play all media simultaneously. Grid View of mediaplayers. – (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CollectionCell forIndexPath:indexPath]; // get URL Player *mediaPlayer = [[self playerArray]objectAtIndex:indexPath.row]; NSURL* videoURL = [NSURL URLWithString:mediaPlayer.url]; MPMoviePlayerController* mPlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL]; [mPlayer prepareToPlay]; [mPlayer play]; //For … Read more
for(int a=0;a<200;a++){ for(int g=0;g<200;g++){ char str[10]; snprintf(str, 10, “%d,%d”, a,g); key = [NSString stringWithCString:str encoding:NSASCIIStringEncoding]; } } Runs 4 times as fast on my old ipod touch 2g Time old: 4.303022833333 Time new: 1.117406833333 3 solved Is there a way to speed up this Objective-C string assignment?
You are using the SAME TAG “Images” for every number you set. Hence it gets replaced again and again dic=[[NSMutableDictionary alloc]init]; for (m = 0; m < 20; m++) { rnd = arc4random_uniform(FrontsCards.count); [dic setObject:[NSNumber numberWithInt:rnd] forKey:[NSString stringWithFormat:@”Images_%d”,rnd]; } NSLog(@”%@”,[dic description]); 0 solved Insert few objects from an array in nsmutable dictionary
Well you question is divided into 2 parts and I’ll answer them both. 1- What you are looking for is UIGestureRecognizer where it’ll recognize a gesture and do an action accordingly. Here is a link taht will help you out! https://www.raywenderlich.com/76020/using-uigesturerecognizer-with-swift-tutorial 2- Unlocking the phone is impossible without jailbreak. Your gestures are bound to your … Read more
First of all please specify what do you use to draw. Do you use any API or Core-Graphics Framework for drawing. Here are some of the approaches from the link I found. Approach: on touchesEnded, save the image to app sandbox with a name like.. 1.png, 2.png etc. then put a count on “undo” variable. … Read more
Use UITextView for text editing. If you need rich text, you have to write something on your own – not currently available. Cocoanetics did start implementing rich text label at https://github.com/Cocoanetics/NSAttributedString-Additions-for-HTML and AFAIK he did want to create rich text editor too (at least I read this on Twitter). solved Text Editor Example for iPhone … Read more