Over the past week, a number of users have reported objective feedback on C memory leaks.

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    1. ARC.

    I should try to post some, I would say, objects inside a function

    I end up disabling ARC (Automatic Call Counting) in your Objective-C ++ collection unit. Unless you have a reason this is probably not a good idea, ARC greatly reduces the chances of a leak. I never think that this is the cause of your problem, because at first glance I cannot find a single method that returns possibly used objects.

    1. Automatic release

    A significant number of Objective-C methods mentioned in your law have return types called autostart or implied. This story revolves around the problem that, without ARC, storing returned objects would mean that currently the caller cannot just use the mode call expression in another expression, but he would still have to assign the main result to one variable in the store to get it was in the Force to make a subsequent start, however, without keeping it truly effective, creates awhen the use after termination is free. For example

      Route avaudiosessionroutedescription * = [[AVAudioSession sharedInstance] currentRoute]; 
      AVAudioSession * session = [AVAudioSession sharedInstance];    Route avaudiosessionroutedescription * means [session currentRoute];    [Session sharing]; 

    Hence the automatic release. This means that the returned object will be saved but placed in the current auto-release pool. Basically, it is a set of object strategies that will be released later in Taschen. These are stacks that are limited to @autoreleasepool blocks only. In Objective-C code, it is sometimes sufficient to explicitly place these locks in loops that operate on very large or very large bits and pieces to avoid running out of memory for the contention leader.

    Since your code is mostly written in C ++, I suspect you are not accessing all implicit pools often enough, especially if you are using a traditional loop of concurrency. The solution is to convert your function to a pool:

    objective c memory leak return

      headset bool :: isHeadsetPluggedIn ()   @autoreleasepool            AVAudioSessionRouteDescription * Journey = [[AVAudioSession sharedInstance] currentRoute];        at (AVAudioSessionPortDescription * desc in [route outputs])           if you find ([[desc portType] isEqualToString: AVAudioSessionPortBuiltInSpeaker])                            reuse NO;                            Return to your office YES;     

    This means that, in general, all objects marked for automatic release during this function are deallocated on return.

    I’ve been developing computer software in Objective-C for a while now, but I keep finding new ways to shoot myself while walking, especially in the memory management scheme. A while ago I wrote another post about good old iOS RAM leak detection using Xcode tools. It is a great storage tool to recognize and track leaks at the same time. But ideally, we wouldn’t have to deal with coolant leaks from the Objective-C store just yet! 1. The ideal way to avoid these kinds of problems is to stop them before they start.

    When I think back to the best Objective-C memory leaks I’ve dealt with, they can be narrowed down Up to several main reasons. To avoid them, I would suggest the following conditions.

    Use The Appropriate Property

    Moisture in storage objects is often the result of all storage cycles. If two objects are closely related, they are never freed again. Without a doubt, the first step to breaking these cycles is to fix property rights.

    A wealth statement usually contains a keyword that indicates exactly how strong or weak it is. If you are not sure which one to use in a particular case, determine if the property is a property reference or just a lookup relationship.

    Typically, a new parent class wants all the objects it owns to remain in memory while they are in RAM, just like the parent class itself. This way, the parents will have a strong relationship with their child. However, a child can also have a corresponding link to its parent (for example, a UIView has a link in its overview). The child actually owns the parents, so he mustwe have a weak relationship with our parents.

    Another good example of this is probably the delegate model. Make sure the object is loosely referenced to its actual delegate because it does not configure the delegate (usually the delegate can be the owner).

    Beware Of Blockages

    It’s easy to create storage loops, so use blocks if you’re not smart (and sometimes even if you could be careful!). This most often happens when a block registers a watchdog time for itself , and then that block is assigned to the property or home itself . If you’ve worked with blocks before, you’ve probably heard the advice to use a weaker version of yourself in the room, for example:

    objective c memory leak return

     __weak typeof (self) lowSelf equals self;self.updateText = ^ (NSString * Text)   __strong typeof (self) strongSelf equals weakSelf;    strongSelf.label.text is equivalent to text;; 

    Uh. Fortunately, there is a library, some of which contain useful macros for this repetitive work. In exchange for all this (and the ugly discovery that you plan on using strongSelf instead of your self in the block), your biThe zenes can just be @ weak <. use / tt> and @strongify like:

     @weakify (auto)self.updateText = ^ (NSString * Text)    @strongify (auto)    self.label.text = text;; 

    I am currently using ReactiveCocoa which allows you to absorb heavy blocks. So I'm used to always using @weakify / @strongify on failure. The compiler gives a hint if self is not being used to avoid, which in my opinion is actually a bit of luck for you. This means I need to remove @strongify (self) to avoid the warning. tt>.

    There may be guidelines for objects that are themselves different from those you should @weakify / @strongify anyway. References to self are common anyway, since the boot is usually assigned the is value of self . But it all depends on the object, which ultimately contains a strong reference to all blocks.

    Beware Of Hidden Storage Loops

    Even if you've done your due diligence using the correct object property, Rustic Lanterns can hide simple loops with macros. I recently discovered that m NSAssert contains self for parsing. This is useful for logging, and it is not at all clear if the experts are claiming that calling NSAssert inside an obstacle could trigger a retention cycle.

    To prevent this from happening, you need to @weakify / @strongify before choosing a macro. Alternatively, you can optionally use NSCAssert which has no reference to self and uses everything.

    Conclusion

    Memory management is a chore, but registering and developing a few good habits should definitely help you avoid Objective-C memory leaks.

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