Weak Self Objective-C in Blocks

	@implementation XYZBlockKeeper
	- (void)configureBlock {
	self.block = ^{
	[self doSomething]; // capturing a strong reference to self
	// creates a strong reference cycle
	};
	}
	...
	@end
	/*
	It’s best practice to capture a weak reference to self, like this:
	*/
	- (void)configureBlock {
	XYZBlockKeeper * __weak weakSelf = self;
	self.block = ^{
	[weakSelf doSomething]; // capture the weak reference
	// to avoid the reference cycle
	}
	}

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