iOS UI background code template

/* learned from http://www.objc.io/issue-2/common-background-practices.html */
__weak id weakSelf = self;
[self.operationQueue addOperationWithBlock:^{
 NSNumber* result = findLargestMersennePrime();
 [[NSOperationQueue mainQueue] addOperationWithBlock:^{
 MyClass* strongSelf = weakSelf;
 strongSelf.textLabel.text = [result stringValue];
 }];
}];

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