danielgindi / DGBlockThrottle

A little utility to throttle calls to a block in ObjC

DGBlockThrottle

A little utility to throttle calls to a block in ObjC. This is great for many uses, one of the most common is handling progress of a NSURLConnection request. Because you may receive many calls for new bytes, and may want to make sure you only call the progress delegate/block once every 150ms or so.

Simply call it like this:

    void (^myThrottledBlock) = 
        [DGBlockThrottle throttledBlock: myCodeBlock
                                onQueue: dispatch_get_main_queue()
                                   wait: 0.3
                                leading: NO
                               trailing: YES];
    
    // Now we can call `myThrottledBlock()` many times, and `myCodeBlock` will only be called once every 300 ms!

Arguments:

• throttledBlock is obviously the block that you want to throttle. The only kind of block accepted is a void returning, no-arguments block.
• wait is the amount of time (in seconds) to wait between calls to your block.
• leading means whether you want the first call to the throttle block to execute your block or not. This allows
• trailing means whether you want to have another call to your block issued after you have stopped calling the throttled block.

If you call the override of [DGBlockThrottle throttledBlock:onQueue:wait:] then the default is leading: NO and trailing: YES

Me

• Hi! I am Daniel Cohen Gindi. Or in short- Daniel.
• [e-mail] is my email address.
• That's all you need to know.

Help

If you like what you see here, and want to support the work being done in this repository, you could:

• Actually code, and issue pull requests
• Spread the word

License

All the code here is under MIT license. Which means you could do virtually anything with the code. I will appreciate it very much if you keep an attribution where appropriate.

The MIT License (MIT)

Copyright (c) 2013 Daniel Cohen Gindi ([e-mail])

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.