Tagged Questions

iOS is an operating system for mobile devices developed by Apple Inc. that is currently used in their iPhone, iPod touch, iPad, and Apple TV (2nd generation) devices. It shares a lot with Mac OS X, but is optimized for touch-based interfaces.

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Pulling Objects & Values From Arbitrarily Nested JSON

I got tired of stringing together objectAtIndex: and objectForKey: and hoping nothing fails along the way. I parse a lot of JSON from sources like the Google Directions API and it was cluttering my ...
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0answers
20 views

Objective-C class for placing UI elements based on screen size

I'm always programmatically creating and laying out UI elements in multiple ViewControllers and I've wanted an easy way to get relevant Screen information (sizes/points) globally using a helper class. ...
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71 views

SDWebImage - Fetch more images

What I am looking to do is, apart from setImageWithURL method of SDWebImage, load other images from the array of URL's. So, in the completion block of setImageWithURL, I call a method ...
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0answers
19 views

Select first or last object from id<NSFastEnumeration>

So I found this code in our project and it just feels like the wrong way to do what its seems to be doing id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults]; ...
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0answers
18 views

Is this proper code for removing a CCSprite under certain conditions?

This is a "answer" to my own question over at stackoverflow, head over there to see what I am trying to accomplish. ...
3
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1answer
24 views

Creating an expanding CCSprite cluster

I am creating an "explosion" of circle sprites from the character with this code, and I was wondering if there is a more effective way to do such things, because this just seems too stupid. (This is ...
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1answer
111 views

How can I improve below Objective-C code to tint an image?

I have an image which is a black ring: In my view, I need to display it as a white ring. So, to tint the image, I have written the below method: - (UIImage *)getRingImage { UIImage *ringImage ...
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0answers
27 views

Class Designin patterns: how to design reusable classes

I want your opinion if this is decent design and how I can improve it if need be. I got the two classes DigBackground and DigParallaxBackgroundLayer (A parallax background is a image consisting of ...
2
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1answer
51 views

A structure and helper functions for working with polar coordinates

Cross posting from Stack Overflow (not sure how to more correctly cross-post). This started simple, as most things do... I just wanted a little structure to hold polar coordinates for a totally minor ...
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2answers
144 views

iOS/Objective-C “if” best practice

I've got this code that I found in a project and I'm wondering how can it be done better: - (void) setAlpha:(float)alpha { if (self.superview.tag == noDisableVerticalScrollTag) { if ...
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vote
1answer
71 views

Is there a more optimal way to write the following encoding and then assign the result to a label?

Is there a more optimal (or concise) way to write the following: I have to do some encoding and then assign the result to a label. // encoding fix NSString *correctStringTitle = [NSString ...
2
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1answer
44 views

A better approach to coding the a string value test for a NSDictionary object

My conditional code here seems repetitive and long. Is there a better approach? I want to test for a string value in a NSDictionary object and then depending upon the value prefix a UILabel with $, £, ...
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2answers
191 views

Optimizing iOS method in objective-c

I have such method and have a hard time optimizing it to run better. It takes roughly 1 sec with 100 units to get between NSLog(@"Debug2") and NSLog(@"Debug3"). And 2 sec on iPhone. Method idea: ...
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2answers
520 views

iOS View Controllers - Default Lazy Loaded Properties (Tab Bar Item & Navigation Item)

It is a little thing about UIViewController, but it has always bothered me - the boilerplate code needed to setup some of a view controller's default properties (e.g. the tab bar item and navigation ...
2
votes
2answers
111 views

Need an Obj-c code review for core data implementation

I'm just beginning my foray into iOS development and need a code review. I have a custom NSManagedObject that needs some smart setters. New to obj-c, iOS, and core-data development, I don't trust ...
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1answer
67 views

Optimization of percent match code xcode

I have the following method that will take the car parts I searched for and match them to my car object in array. Then it tells me the percent match. Example Car.h has NSSet toCarParts. toCarParts ...
2
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1answer
123 views

Initialize a bunch of NSDateComponents objects at once (in a loop)?

I'm developing an iPhone app that is heavily Calendar-based, and it requires a good amount of (what I'm calling) "date boundaries." I use these "date boundaries" to fetch EKEvents from specific ...
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1answer
146 views

Testing the same code with different input data

I would like to get an advice regarding how to test the same code with different input data. I would like to test that method operationSucceeded will be invoked for all successful status codes. Here ...
2
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1answer
103 views

Rot47 an NSString Category

As a JAVA native, i am always a litle worried when doing objective-c... memory leaks and pointers flying at my head... All comments are welcome on the Category below, the Category functions are ...
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0answers
36 views

NSArray and NSNumber-int conversions

I have a textView which is displaying a string. I also have an array which keeps track of where every line begins, it stores the "start index" or NSRange.location for every line. However, when text ...
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1answer
182 views

is my date difference calculation correct?

-(NSString *)calculateTimeDifference:(NSString *)timeStamp{ // get the current date NSDate *date = [NSDate date]; NSDateFormatter *dateFormat = [[NSDateFormatter alloc]init]; [dateFormat ...
4
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2answers
1k views

Dependency Inversion / Injection? - Networking code in model classes

@implementation User - (void)refreshProperties { assert(!self.isSyncing); NetworkOperation *op = [[NetworkOperation alloc] initWithEndPoint:GetUserDetails parameters:nil]; [self ...
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1answer
151 views

iOS UITableView; saving cell checkmarks to disk

As per suggestion on SO, I am posting my code here to be reviewed. It was said I should not be saving and reading from disk so many times when a user selects and deselects a cell in my tableView. ...
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1answer
240 views

How to optimize loading of images? (especially cocos2d)

So i recently started game development (which is freaking awesome), but one of the things that i never put much thought to was the loading of images. i'm curious as to advice for improving my current ...
6
votes
2answers
510 views

Custom numberpad on an iPad

I'm an active user on SO, however I just found this site and this is my first question here. I am a self-taught programmer who has been programming for a long time, but mainly just for personal ...
3
votes
1answer
147 views

Improving calculation code

I'm making a converter app, and after realising I would have to type about 200 lines of code to get it working with more than 5 units converted, I should have a better conversion calculation. What I ...
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0answers
207 views

Age verification in Objective-C

I'm creating some age-verification functionality for an iOS app. The user is presented with a UIDatePicker object, and the latest selectable date should be today minus 18 years. How vulnerable to ...
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votes
2answers
159 views

Am I reconstructing the buffers correctly

I am writing a networked audio application that sends the audio in 320 byte chunks, later I need to provide the player a bigger amount of bytes to play so I try to merge 2 or more chunks into one ...
4
votes
1answer
90 views

iOS: Upgrade this animation code

I understand that this animation code is outdated: [UIView beginAnimations:@"Move" context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDelay:0.08]; ...
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0answers
81 views

Core Data code for manually creating a lot of entries from old ones

Does this looks ok to everyone? NSFetchRequest *oldFetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *oldEntryEntity = [NSEntityDescription entityForName:@"Entry" ...
2
votes
1answer
273 views

Data model code review for iOS app

I'm new to iOS development and I'm having trouble figuring out how to efficiently load my app's data at launch time. My app consists of a UITableView that is populated with a list of songs. Each cell ...
2
votes
0answers
340 views

iOS: Parsing NSDictionary from NSJSONSerialization

playerObject is an NSDictionary from JSONObjectWithData:options:error: I'm trying to update a CoreData entity. My code looks like this: if ([results count] > 0) { newPlayer = (Player ...
1
vote
1answer
89 views

Efficiency of grid generated by for-in loop

I've spend the last several hours working on a loop designed to take items in an array and arrange them as a so to speak "gird" of UIButtons. As far as I've been able to see through testing this code ...
2
votes
1answer
180 views

Tips on good practice in my bash script that logs in to a website, downloads a PDF, adds it to iBooks and uploads it to dropbox

I am running a scheduled script on my iPhone that logs in to a website, downloads a PDF, adds it to iBooks and uploads it to dropbox. All of this happens only when it has WiFi access. I want to make ...
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13answers
2k views

Bad Practice to have Long If-Else statements?

EDIT: One of the bigger questions I have is that, is using switch-case more efficient then using this? Right now in my application (a weather app), I have one section of code in my View Controllers ...
2
votes
1answer
731 views

Optimize sorting of Array according to Distance (CLLocation)

Currently my below code takes an average 9.27300 every time I run it. This is an iOS application and I can't expect the user to sit there for roughly 10 seconds. This code takes an array ...
1
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0answers
353 views

Core Data - Data Model Design - Bidirectional Ordered To-Many Relationships - Reduce Complexity and Reveal Intent

I have a Core Data model with two entities Video and Playlist. A Video can be a member of many Playlists A Playlist can have many Videos, including the same Video multiple times A Playlist's Videos ...
3
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3answers
287 views

Standard delegate methods

I'm aware standard delegate method declaration should include the object that triggers the method, usually of the class that declared the protocol. That's fine when the delegate method includes ...
5
votes
1answer
428 views

How quality is this piece of code?

I am contemplating working with a development firm, and had asked for this piece of sample code. Could you please take a look and let me know if this is a quality piece of work, or if it needs ...
1
vote
2answers
3k views

iOS4 alternatives for dismissViewControllerAnimated:completion:

My inspiration for creating this protocol came from iOS 5's "dismissViewControllerAnimated:completion:" addition to UIViewController. I wanted this functionality in iOS 4.3. I find using the modal ...
2
votes
1answer
493 views

Display complex mathematical equations in iOS 5.0 devices

I am working on an app for iPhone and iPod Touch that has to show complex mathematical equations like algebraic, integration, summation formulas along with some text. For that I have used Quartz2D ...
3
votes
3answers
442 views

Handle Java Process outputs without extra-threads

Usually, people would create two extra-threads in order to read the standard output and error respectively. However, the following code would allow to handle a Process outputs without those threads ...
4
votes
3answers
513 views

Am I using too many if statements?

Essentially, I am making an app that allows the user to type in chemistry formulas using a custom keyboard. The keyboard will have several keys, for example, "Na", "H", and "O". Pressing them in ...
2
votes
1answer
213 views

Can this game function/code be better?

I'm working on a game for iOS devices and this is the function we use to create server-loaded buildings. The server loading is in another function and everything works just fine, but I was wondering ...
1
vote
1answer
876 views

Selective autorotation in a UINavigationController

In a current project I needed to enable/disable autorotation of the UI to specific UIView's. I looked around and did not find a working solution that fitted my case and returning NO in ...
1
vote
0answers
323 views

Help me improve the way I handle rotations in iOS painting app

I have an iOS app that support all orientations. I sometime notices performance issues when I rotate the device, and sometimes it crashes, badly. And it's not as smooth as other apps. This is my first ...
1
vote
1answer
106 views

I am Designing a singleton cacheManger class . Want some helps to make it as a good class

Here i am designing a FileCaching class. Can any one tell me is i am doing the right way. What i want to know is is my CacheManager class is a singleton , or what abt the memmory management of ...
1
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0answers
339 views

Optimizing a search for list of artists in iTunes library

I'm trying to get a list of all artists on an iPhone / iPod touch music library. The best way I've found has been to group by artists (the convenience constructor on MPMediaQuery) and to iterate over ...
3
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0answers
2k views

What can I improve on my iOS PDF class?

This is the first PDF class I have made for the iOS using code from Apple's samples, there could easily be stuff here wrong that I am missing. I intend this to get images out of for a layer, for ...
0
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1answer
712 views

Core Location - Practices for Supporting Common iOS Devices

Typical tutorials suggest simple CoreLocation code similar to the following: Header #import<CoreLocation/CoreLocation.h> @interface MyCLController : NSObject <CLLocationManagerDelegate> ...