dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
for (inti =0; i < 2; ++i){
NSLog(@"1------%@",[NSThread currentThread]);
}
// 回到主线程
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"2-------%@",[NSThread currentThread]);
});
});
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