I am trying to create a method that will return me a ALAsset for a given asset url. (I need upload the asset later and want to do it outside the result block with the result.)
In many guide about how to use blocks and GCD, one tip is always mentioned : do not retain self in block.
I would like to create a subclass of UIActionSheet that uses blocks instead of delegation. So I created the following class:
I need to traverse all key/values pairs of a dictionary and do something with both fields. I am wondering what is more efficient, the traditional \'foreach key\' approach or the blocks approach using
I am define TOOLS_COMPUTE_TIME like this #define TOOLS_COMPUTE_TIME(op) [Tools computeTimeWithName:__PRETTY_FUNCTION__ block:(op)]
As you may be aware, blocks take -invoke: void(^foo)() = ^{ NSLog(@\"Do stuff\"); }; [foo invoke];// Logs \'Do stuff\'
In one of Apple\'s header files for libdispatch, queue.h, the following warning appears: // The declaration of a block allocates storage on the stack.
AFA开发者_StackOverflow社区IK, __block is used when you\'re changing, inside the block, the address that a variable (declared outside the block) points to.
For some reason this code does not work: [request开发者_运维百科 setCompletionBlock:^{ NSString *response = [request responseString];
Executing a block inside @synchronized seems to negate the lock. - (void)method { @synchronized(self) {
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