exc-bad-access

问题 How is method removeFromSuperView: really works? I got a problem of memory bad access when I want to reinit the view - (id)init { if (!(self = [super init])) return nil; _mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; NSLog(@"retainCount :%d", [_mainView retainCount]); UIButton *reInitButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f,0.0f,90.0f,35.0f)]; [reInitButton addTarget:self action:@selector(buttonDidTapped:) forControlEvents

问题 I am writing a openGL program(C++) which draws a ground with two 3D objects above it. The programming tool I use is Xcode version 8.0(8A218a) (OSX 10.11.6). my code(main.cpp): #include <GL/glew.h> #include <GL/freeglut.h> #include <glm/glm.hpp> #include <glm/gtc/matrix_transform.hpp> #include <iostream> #include <fstream> using namespace std; using glm::vec3; using glm::mat4; GLint programID; //initialize all OpenGL objects GLuint groundVAO, groundVBO, groundEBO; //ground bool checkStatus( /

问题 I'm trying to write a slugging function which involves stripping out any punctuation characters except for hyphens. I thought the best way to do this would be to create a new CharacterSet as follows: import Foundation extension CharacterSet { func subtracting(charactersIn string: String) -> CharacterSet { let unwantedCharacters = CharacterSet(charactersIn: string) return self.subtracting(unwantedCharacters) } } let punctuationCharactersExcludingHyphen = CharacterSet.punctuationCharacters

问题 Hi I'm having a weird problem. My app is based on the samplecode of "PageControl" (the Apple example). It uses a horizontal scrollview in which most of the stuff is happening. At he bottom I have a UIToolbar from which I call a modal viewcontroller. On XCode 4 everything worked like a charm, after the upgrade to XCode 4.2 (with the new SDK) I get a "exc_bad_access" on dimissModalViewcontroller. The funniest thing is that it does not happen rightaway but only after 2 or 3 times presenting and

问题 I am trying to create a simple card shuffling and dealing simulator. I am using a vector to represent a deck of 52 cards and each card is represented by the structure BitCard whose elements' space is memory is limited by bitfields. But when the constructor tries to access the vector, xCode throws a BAD_ACCESS exception: Thread 1: EXC_BAD_ACCESS (code =1 address = 0x0) . I've done some research and found that this exception is linked with a null pointer but can't seem to figure out how to fix

问题 I'm trying to include this barcode source code by Stefanhafeneger to my project. I started it with a simple camera example and the barcode engine, everything works fine for the 1st barcode decode. When I try with the 2nd times, i receive EXC_BAD_ACCESS. It only work 1 time after that the application will crash. Here is a screen recording of how the appilcation crash. i'm testing with this DataMatrix tag from google in my appilcation. i was surfing for solution for few days, I had tried

问题 I have a navigation app with 3 view controllers on the stack. The navigation root pushes AvailableItemsViewController, passing a managed object context to it. This view, which is a table view that uses a fetched results controller to populate it, has an add button which pushes another controller (CreateNewItemViewController) I pass that context off to it. In CreateNewItemViewController I create a managed object, save it to the context, then pop the view controller. I can go back and forth

问题 So I am getting this error (picture below). What is happening when I get this error is going through my core data data base and averaging out results based on battery statistics that I have collected. This was working fine until I took a break and then came back, plugged it in and it started getting this error. I have an exception breakpoint, but it is still not showing me anything other than the crash in the image. Anyone know what i should do? xcode Version 5.0 Let me know if i can post

问题 I have a view controller from where I am launching an UIAlertController on click of a Button. Below is my code: - (IBAction)playOnlineURL:(UIButton *)sender { [self launchPlayURLAlert]; } - (void) launchPlayURLAlert{ NSString *defaultURLString = @“MY URL”; UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @"Play Online URL" message: @"Enter the URL" preferredStyle:UIAlertControllerStyleAlert]; [alertController addTextFieldWithConfigurationHandler:^(UITextField

问题 I am getting an EXC_BAD_ACCESS. I know what this usually means: Trying to access an object that doesn't exist (anymore) is the most likely cause. So, where do I find that? I have read numerous posts on the internet, and they all say: "Enable NSZombie" in the scheme. Now when I run the debugger, for what should I look? I can not see any difference... Note: This is not about a perticular error in my code, but generally how to use the debugger with NSZombie enabled 回答1: What I would do it will