Xcode 9 seems to report many calls to Main thread to UIApplication properties. Although the user interface is not updated, it is especially cumbersome due to the expansion of the logs, it creates a default environment.
4 TestApp 0x0000000101c262e0 __39-[ViewController viewDidLoad]_block_invoke + 196
5 libdispatch.dylib 0x0000000102279654 _dispatch_call_block_and_release + 24
6 libdispatch.dylib 0x0000000102279614 _dispatch_client_callout + 16
7 libdispatch.dylib 0x0000000102289008 _dispatch_queue_serial_drain + 716
8 libdispatch.dylib 0x000000010227ce58 _dispatch_queue_invoke + 340
9 libdispatch.dylib 0x000000010228a1c4 _dispatch_root_queue_drain_deferred_wlh + 412
10 libdispatch.dylib 0x00000001022917fc _dispatch_workloop_worker_thread + 868
11 libsystem_pthread.dylib 0x00000001ac6771e8 _pthread_wqthread + 924
12 libsystem_pthread.dylib 0x00000001ac676e40 start_wqthread + 4
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