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January 20, 2015 21:53
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Multi Threading in Swift (iOS) using Dispatch Group
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| //Group 4 will be executed last after 1-3 are done executing | |
| //Multi Threadin in Swift Group Dispatch Example | |
| //Global Dispatch Queue | |
| let dispatchGroup = dispatch_group_create() | |
| dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| for i in 0...3{ | |
| dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| println("\n i - \(i)") | |
| dispatch_group_enter(dispatchGroup) | |
| dispatch_group_async(dispatchGroup, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| NSThread.sleepForTimeInterval(2.0) | |
| println("\nBlock 1\n") | |
| dispatch_group_leave(dispatchGroup) | |
| }) | |
| dispatch_group_enter(dispatchGroup) | |
| dispatch_group_async(dispatchGroup, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| NSThread.sleepForTimeInterval(5.0) | |
| println("\nBlock 2\n") | |
| dispatch_group_leave(dispatchGroup) | |
| }) | |
| dispatch_group_enter(dispatchGroup) | |
| dispatch_group_async(dispatchGroup, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| NSThread.sleepForTimeInterval(1.0) | |
| println("\nBlock 3\n") | |
| dispatch_group_leave(dispatchGroup) | |
| }) | |
| dispatch_group_notify(dispatchGroup, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { | |
| println("\nBlock 4\n") | |
| }) | |
| }); | |
| } | |
| }); |
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when added dispatchGroup.enter() before each
(DisplatchQueue.global(....)) - block
then ok ...
( and in main process need to wait for those to complete - example add sleep if testing in Mac there ...)