How to scroll UITableView to a certain position?
I would like to scroll my UITableView 2 cells down when clicking on a button. The total height for the shift downwards is 100px. How can I accomplish this? ...
cocoa-touch
What is the proper way of hard-coding sections in a UITableView?
I have a UITableView with 3 sections that are hard coded. Everything is working fine, but I am not sure if I am doing it correctly. Define number of rows in section: - (NSInteger)tableView:(UITableView *)tblView numberOfRowsInSection:(NSInteger)section { NSInteger rows; //Bio Section if(section == 0){ r...
Using the system localizations on iPhone
I want to make a back button for a navigation controller with the title "Back" instead of the title of the previous controller. I'm using this code: UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Back", @"Back") style:UIBarButtonItemStyleBordered tar...
Drawing formulas with Quartz 2d
In my iPhone App I'd like to draw a few formulas. How can I manage that with quartz 2d? Is there a way to build formulas like for example in latex? Or are there any existing frameworks? Thanks. ...
setDelegate:self, how does it work?
I have a query regarding how delegates work. My understanding was that delegates take responsibility for doing certain tasks on behalf of another object. locationManager = [[CLLocationManager alloc] init]; [locationManager setDelegate:self]; [locationManager setDistanceFilter:kCLDistanceFilterNone]; [locationManager setDesiredAccuracy:...
Why are the default UI controls in my iPhone app blurred?
Why would the default iPhone interface elements, specifically the UISwitch (unmodified) and a UISegmentedControl appear slightly blurred? I have not changed them or called any private APIs. This blurring occurs when I run it both in the simulator and when I load it on my iPod Touch, so I don't think it's a one off drawing glitch. These e...
How can I set a UINavigationController as my initial screen when I have a UITabBarController?
I have a UITabBarController that loads a UINavigationController for each of its tab. The first tab is obviously my initial screen, however I don't want the tab-bar to be visible for this screen. Maybe my approach is wrong. How can I make sure that a UINavigationController is shown as my initial screen? ...
How can i make my UITableViewCell contain two labels?
I want my UITableViewCell to look like the image below where there seems to be two labels. Is this possible without subclassing UITableViewCell? ...
Cocoa Touch best practice for capturing/logging/diagnosing crashes
As I get closer to releasing my first public iPhone app I'm concerned about catching crashes in the field. I'm curious to hear how others have gone about this. I'm not sure what's possible outside of the debugger. Is all lost with an EXC_BAD_ACCESS or can I still catch it and get something useful into a log? Is the program main() the sp...
Backwards compatibility when using Core Data
Could anybody shed some light as to why is my app crashing with the following error on iPhone OS 2.2.1 dyld: Symbol not found: _OBJC_CLASS_$_NSPredicate Referenced from: /var/mobile/Applications/456F243F-468A-4969-9BB7-A4DF993AE89C/AppName.app/AppName Expected in: /System/Library/Frameworks/Foundation.framework/Foundation I have w...
Cocoa Touch: How to have a controller always visible over other views
I'm relatively new to Cocoa programming, but I've managed to figure a fair amount out. One thing I haven't been able to figure out yet is how to have an element that is visible over all views. Like a volume control that is always visible just above the tab bar at the bottom of the screen. How should I go about doing that? ...
How can I build an app with multiple types of controllers?
How can I accomplish the following: When my app loads a UIView will show 4 buttons Clicking on a button will load a UITabBarController (not a UIView with a UITabBar) that can display multiple views. This seems challenging to me, because in order for me to use the UITabBarController I need to add this to the window's subview in my app...
What UIKit elements can be used to replicate the App Store/iTunes Store paged grid?
I'm new to Cocoa Touch, so this might be pretty easy, but I can't seem to figure out what UIKit elements were used to create a grid like this? Is this simply a UITableView with a pagination controller? If so, how'd they style it like this? Thanks! PS: I'm not allowed to post images yet, i guess. hopefully the link works... http://img...
How to handle duplicate symbol error from 3rd party libraries?
I have two 3rd party libraries that seem to use the same class. That should be fine but I'm getting this type of error when building: ld: duplicate symbol .objc_class_name_CJSONScanner in /Users/myappOne/TapjoyConnect/Frameworks/libTapjoyConnectSimulatorRewardInstall_Ads_Pinch.a(CJSONScanner.o) and /Developer/Projects/BuildOutput/Debug...
UITableView does not scroll to cell
I am trying to scroll my tableview to the 2nd cell: [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0] atScrollPosition:UITableViewScrollPositionNone animated:NO]; I get the error: *** Terminating app due to uncaught except...
Cache tableView cell data
Hi all, In my application, I want to cache the displayed data in tableview so that whenever the application starts or if the internet connection isn't there, my tableview should be able to display the cached old data [not completely but say 10 old cached cells]. What I'm displaying in individual cells is an object of one of the 8 clas...
Reach the end of the tableview without using 'numberOfRowsInSection' delegate method iphone sdk
Hi all, I want to add a view after the last cell of tableview. I need to define the frame for it. If I want to add something before the first cell, then I can set the frame as refreshHeaderView = [[EGORefreshTableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f - self.view.bounds.size.height,320.0f, self.view.bounds.size.height)]...
How to calculate a point with an given center, angle and radius?
In this SO question, someone asked for calculating an angle from three points. I need to do the opposite thing. I want to draw a clock, and I have tiny tick images. An art dude made 60 of them, each with an individual and accurate shadow. So there are 60 distinct images at 10x10 points in size, already correctly rotated in the center of...
Need some help in runAction method in cocos2d .
I have a small doubt in CCAnimation. Is there any difference between the code1 and code 2 in performance ? code1: id Action1 = [CCAnimate actionWithAnimation: numberAnimation restoreOriginalFrame:NO]; id Action2 = [CCFadeOut actionWithDuration:0.1f]; id Action3 = [CCCallFunc actionWithTarget:self selector:@selector(...
Finding out where I am in uinavigationcontroller hierarchy, or if view has been pushed?
I've got a view that sometimes appears as a pushed view of uinavigationcontroller, and sometime just as the initial view of a tab-bar item. There's a 'Save' button on the interface which I want to make the view pop back to previous view when it's been pushed onto screen, and do nothing when it's being displayed as part of a tab bar sele...