automatic-ref-counting

问题 I need a calendar View in my iOS 5 project. I found this Library on github that is exactly what I need. However, it was bult for versions of iOS previous to iOS5. As a preliminary step of integration, I downloaded the zip files and converted the projects into ARC compatible iOS 5 project using the feature in XCode 4 under "refactor->Convert to Objective-C ARC" to do this. I bult that project and it built fine in iOS5. Now I m following the instructions on how to integrate the files in my

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . I am working on an iOS ARC app (more code available on request), and earlier I was producing and discarding large numbers of images. I thought that I somewhere still had a reference to images, even if I called removeFromSuperview and tried to remove all references to no-longer

问题 I just use CFNumber as a example，so it can be any type don't have a Fundation toll-free part! I just write some test code like this: typedef __attribute__((NSObject)) CFNumberRef MYNumberRef; int main(int argc, const char * argv[]) { @autoreleasepool { MYNumberRef ptr = NULL; double myDouble = 10.1; ptr = CFNumberCreate(kCFAllocatorDefault, kCFNumberDoubleType, &myDouble); CFIndex count = CFGetRetainCount(ptr); } return 0; } It is very strange that the count is 2. But if I use CFNumberRef ,

问题 Hi i have problem with my app with memory leak on UILabel in cells on table view. Every time if I enter to table view and back, memory rise with 2mb, and if I enter to that view again it rise with next 2mb. Why I know that is because of UILabel : - I checked it with profiler:zombies and - If I remove UILabels from cell, I hadn't memory leaks For start I defined my cell: @interface ExpandableTableViewCell : UITableViewCell{ BOOL hasData; NSString *documentTypeId; NSString *documentId; UILabel

问题 On Cocoa code with ARC enabled, I tried to observe Window closing events like below. ScanWindowController * c = [[ScanWindowController alloc] initWithWindowNibName:@"ScanWindowController"]; [scanWindowControllers addObject:c]; [c showWindow:nil]; NSMutableArray *observer = [[NSMutableArray alloc] init]; observer[0] = [[NSNotificationCenter defaultCenter] addObserverForName:NSWindowWillCloseNotification object:nil queue:nil usingBlock:^(NSNotification *note) { [scanWindowControllers

问题 [ Old question title used to be ARC is set to YES, but xcode shows NO , edited in order to make the question clearer. ] I have an iOS project in xcode 4.2.1 using the iOS 5.0 SDK. The project is under version-control (using the built-in git interface), and one of the early commits was after I converted the project to use ARC. Since then all worked OK with some more commits etc. Now I suddenly notice that the build settings from within xcode shows that the relevant option ("Objective-C

问题 1) Why does this retain its __block var: { void (^blockWithOutPointer)(NSObject * __autoreleasing *) = ^(NSObject * __autoreleasing * outPointer) { *outPointer = [NSObject new]; }; NSObject * __block blockVar1; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ NSLog(@"blockVar1: %@", blockVar1); // prints non-nil. WHY???? }); blockWithOutPointer(&blockVar1); } 2) But this doesn't? void (^blockWithOutPointerThatDispatchesLater)(NSObject

问题 I am getting " EXC_BAD_ACCESS " when touch the button to call the button action. #import "TestViewController.h" @implementation TestViewController - (id)init { self = [super init]; if (self) { self.title=@"IOS5 and Xoced 4.2"; UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(9,6,100,100)]; button.backgroundColor=[UIColor greenColor]; [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview: button]; } return self; } -

问题 I have a question: If I created an app with ARC, what's the last version IOS compatible for my app? If I upload my app in AppStore, everyone can use my app? or only people with a device with a specific ios version? 回答1: ARC is supported on iOS 4.0 with one caveat: automatic nulling of weak references is only supported on iOS 5.0 and above. 回答2: ARC compiled applications work on devices with iOS 4 or better. 回答3: ARC "magic" is done by the compiler, so it is safe to use with iOS 4 of newer. In

问题 I'm writing a simple chat server which broadcasts messages to all the clients connected. The code might look terrible, since I'm a beginner. Peers are not used anywhere yet, since I want to pass it to handle_client function as well, so when data will be available in stream and read successfully, I want to broadcast it over all the clients connected. I understand this is not a good approach, I'm just trying to understand how can I do things like this in general. use std::io::BufRead; use std: