ios - 主线程检查器 : UI API called on a background thread: -[UIApplication delegate]

Question

Xcode 9 似乎报告了很多对 UIApplication 属性的主线程调用。即使 UI 没有更新，这也特别麻烦，因为日志的扩展会产生默认环境。

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

Answer 1

如果这些报告消息让您感到困惑取消选中它们:

1. 编辑方案...
2. 在“运行”>“诊断”中取消选中“主线程检查器”