I have a set of objects, init'd and owned by a view controller. The view controller starts a fetchData method in each of these objects, which runs in a background thread and then, when it's done, returns the main thread and changes a property - self.dataFetchComplete, which the view controller is observing.
我有一组对象，由视图控制器初始化并拥有。视图控制器在每个对象中启动一个fetchData方法，这些对象在后台线程中运行，然后，当它完成时，返回主线程并更改属性 - self.dataFetchComplete，视图控制器正在观察它。
dispatch_async(dispatch_get_main_queue(), ^{
self.dataFetchComplete = YES;
});
If the view controller is deallocated before these objects are finished with this method, when it hits the self.dataFetchComplete = YES; line, it crashes.
如果在使用此方法完成这些对象之前取消分配视图控制器，则当它到达self.dataFetchComplete = YES时;线，它崩溃了。
How can i stop it from crashing when trying to change this property after being deallocated.
在解除分配后尝试更改此属性时，如何阻止它崩溃。
EDIT: More info, and clarity.
编辑：更多信息，清晰度。
1 个解决方案
#1
1
That block has a strong reference to self. The only way self could be deallocated is if you are over-releasing it elsewhere (as @Catfish_Man indicated).
那个街区强烈提到了自我。自我可以被释放的唯一方法是，如果你在其他地方过度释放它（如@Catfish_Man所示）。
-
if you have a crash, post the backtrace of the crash
如果你遇到了崩溃，请发布崩溃的回溯
-
if you have an over-release crash, use Instruments to track all retain/release events on the object.
如果发生过度释放崩溃，请使用Instruments跟踪对象上的所有保留/释放事件。
-
run the analyzer and fix any problems it indicates.
运行分析仪并修复它指出的任何问题。
#1
1
That block has a strong reference to self. The only way self could be deallocated is if you are over-releasing it elsewhere (as @Catfish_Man indicated).
那个街区强烈提到了自我。自我可以被释放的唯一方法是，如果你在其他地方过度释放它（如@Catfish_Man所示）。
-
if you have a crash, post the backtrace of the crash
如果你遇到了崩溃，请发布崩溃的回溯
-
if you have an over-release crash, use Instruments to track all retain/release events on the object.
如果发生过度释放崩溃，请使用Instruments跟踪对象上的所有保留/释放事件。
-
run the analyzer and fix any problems it indicates.
运行分析仪并修复它指出的任何问题。