automatic-ref-counting

问题 As a beginning iPhone programmer, what is the best practice for writing apps to be used either with iOS 5 or older versions? Specifically, should I continue using the release/retain of data, or should I ignore that? Does it matter? 回答1: It's up to you. You can write apps using ARC (Automatic Reference Counting), and Xcode will write "glue code" to allow your ARC enabled apps to run on iOS 4, no modifications required. However, certain things wont work, and most noticeably many libraries you

问题 I am new to iOS5 development and using objective-c. I have trouble understanding the difference between strong and weak storage. I have read the documentation and other SO questions, but they all sound identical to me with no further insight. I read the documentation: Transitioning To ARC - it references to iOS4 terms of retain, assign, and release; which confuses me. Then I look into Open U CS193p, where it differentiates strong and weak: Strong : "keep this in the heap until I don't point

问题 I am new to iOS5 development and using objective-c. I have trouble understanding the difference between strong and weak storage. I have read the documentation and other SO questions, but they all sound identical to me with no further insight. I read the documentation: Transitioning To ARC - it references to iOS4 terms of retain, assign, and release; which confuses me. Then I look into Open U CS193p, where it differentiates strong and weak: Strong : "keep this in the heap until I don't point

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . ARC technology isn't being used in my project. I'm trying to add SBJson library to it. I set -fobjc-arc flag for all files which have SBJson prefix, but during compilation process ARC semantic issue (Pointer to

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . ARC technology isn't being used in my project. I'm trying to add SBJson library to it. I set -fobjc-arc flag for all files which have SBJson prefix, but during compilation process ARC semantic issue (Pointer to

问题 I am a new user of html5 and using canvas to draw circle for one of my application. I have drawn several arcs to form a circle. it works fine. However my problem is that i want to associate a separate mouse event for each of the arc. I goggled and found KinteticJS may be useful. I wish to know is there any other way that could be used to attached mouse event for every arc i created using the canvas. Please note i have used just one canvas there is no ghost canvas and I do not wish to use SVG.

问题 I've created a class called " ConnectionManager " that will handle all network request and fetch data from the server and after that call to a completion handler. ConnectionManager.h #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> #import "UIAlertView+CustomAlertView.h" #import <Crashlytics/Crashlytics.h> @interface ConnectionManager : NSObject<NSURLSessionDataDelegate> @property (weak, nonatomic) NSMutableData *receivedData; @property (weak, nonatomic) NSURL *url; @property (weak,

问题 How can I change the following code to be compatible with ARC: MyObj* fn = nil; [self performSelectorOnMainThread:@selector(popSomething:) withObject:(id)&fn waitUntilDone:YES]; Right now, I get the following error: error: cast of an indirect pointer to an Objective-C pointer to '__strong id' is disallowed with ARC [4] 回答1: The type of the argument should be (id *) , ie. a pointer to an object, not an object. But if you just want to return a value from a method that you need to execute on the

问题 My View Controller class gets deallocated when the app goes to the background. I'm using ARC. I have a UIViewController that subscribes to a notifications when the app becomes active and executes a method. But once the app is about 30 secs in the background and then resumes, the app crashes with "message sent to deallocated instance". Enabling Zombie objects shows that the View Controller itself is the Zombie. Thank you! Instantiation of my view controller (in AppDelegate): UIStoryboard

问题 Usually I write programs without the ARC but I have inherited an application that was written by someone else who used ARC. I need to add MBProgressHUD to it, but anytime I do I get all kinds of release build errors. My question is, is there an alternative to MBProgressHUD or any way to get it to work with ARC? 回答1: Just turn off ARC for MBProgressHUD .h/.m in Xcode. Even though the developer has not contributed to the project recently, I imagine most libraries like this will not see ARC