xcode4.2

问题 How can I set an image for UITableViewController ? I have used many things but it doesn't help me to set the image as background UIImageView* bgView = [[[UIImageView alloc] initWithImage: [UIImage imageNamed:@"Default.png"]] autorelease]; [tableView.backgroundView addSubview:bgView]; And this [[self view] setAutoresizesSubviews:NO]; UIView *backgroundView = [[UIView alloc] initWithFrame:self.view.frame]; backgroundView.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@

问题 Problem: A library I use won't support ARC (Automatic Reference Counting). Background (for those unfamiliar to ARC): http://developer.apple.com/library/ios/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html Manual Solution: Add the -fno-objc-arc option for each implementation file of the library, and otherwise use ARC normally in my application code. Observation: The following template file can be copied and most likely be used to either turn ARC completely ON or OFF (without adding

问题 I am developing an app for iPad3(Retina Display) using Xcode 4.2 [iOS SDK 5.0]. I am using following code snippet for detecting retina (high-resolution) display. if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) { NSLog(@"scale = %f",[[UIScreen mainScreen] scale]); if ([[UIScreen mainScreen] scale] > 1.0) { NSLog(@"Retina Display iPad3"); } else { NSLog(@"Non Retina Display iPad 1/2"); } } When I install app on iPad3 device it is showing output: scale = 1.00000; Non Retina

问题 I am trying to get in to some graphics in C++. I figured it was best to start with the most capable graphics framework so I am going with the OpenGL included in Lion. Basically I started a command line tool in C++ in XCode 4.2 and that's all I have done. I need to somehow link OpenGL with the XCode so I can use it. After I get it set up on my Mac platform, I hope I can use a basic how-to guide for OpenGL for C++ to get further as, if you haven't noticed, I am not entirely clear on how to

问题 I am trying to get in to some graphics in C++. I figured it was best to start with the most capable graphics framework so I am going with the OpenGL included in Lion. Basically I started a command line tool in C++ in XCode 4.2 and that's all I have done. I need to somehow link OpenGL with the XCode so I can use it. After I get it set up on my Mac platform, I hope I can use a basic how-to guide for OpenGL for C++ to get further as, if you haven't noticed, I am not entirely clear on how to

问题 I upgraded my iPad to 5.0 a couple days ago, and upgraded Xcode to 4.2 at the same time so I could continue to test my apps. Now I am having problems with touch code in several apps that worked with previous versions of Xcode. I subclassed UIImageView to add some dragging features by overriding -(void)TouchesBegan and -(void)TouchesMoved . I did not override -(void)TouchesEnded in the subclass, but handled that in the view controller for the view that contains the image view. I pulled the

问题 In Xcode 4.2 when I create a new branch and open it, the iOS scheme which exists in the Master is lost. Instead I have a scheme for 'Mac 64 bit." This has happened a few times in a row and I handle it by creating a new scheme, deleting the 'Mac 64 bit' one and then renaming the new scheme to what the original was. I'd rather fix whatever is wrong though. Did I set something up wrong - some preference somewhere? 回答1: I know this is old question but there doesn't seem to be a good question

问题 EDIT: changed the title. I didn't know it at the time but this is a duplicate of Why am I crashing after MKMapView is freed if I'm no longer using it? This question is similar to Why is object not dealloc'ed when using ARC + NSZombieEnabled but different enough that I thought it worth throwing out there in case anyone understands and can explain to me what is happening. The other question may be an XCode bug so I presume this could be similar. Scenario: RootViewController has a tableView

问题 I can't get this working. If I drop the master UITableView to use Static cells I can get the segues working, such that when you click on a row in the master it automatically pushes the Child controller on. But with 'dynamic prototype' cells, I click on one of the cells and nothing happens... Am I supposed to programmatically push the child controller within the prepareForSegue method or something? In which case I'm not sure what advantage a segue here would have over the old way of just using

问题 I would like to quickly swap two views from one side to the other and wonder if there is a hotkey for this functionality? 回答1: Single Assistant Editor This can be done in two steps. You can start with the cursor in either the Primary or the Assistant editor. Step 1: ⌥ ⌘ , - Open in Assistant / Primary Editor It opens the current file (where the cursor is) in Primary Editor if you are in Assistant Editor and vice versa. You end up with two exact same files open. Step 2: ^ ` - Move Focus to