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我尝试在backgroup的顺序执行任务2用下面的代码:异步任务队列不起作用(SWIFT)
var group = dispatch_group_create();
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
println("start task 1");
NSThread.sleepForTimeInterval(10000);
});
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
println("start task 2");
NSThread.sleepForTimeInterval(10000);
});
dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
当运行任务1和任务2在同一时间执行,不inqequence。
我在做什么错?