Boolean that specifies whether the current thread blocks until after the specified selector is performed on the receiver on the main thread.
一个布尔值，指定是否阻塞当前线程直到指定选择器在主线程中执行完毕。
Boolean that specifies whether the current thread blocks until after the specified selector is performed on the receiver on the main thread.
一个布尔值，指定是否阻塞当前线程直到指定选择器在主线程中执行完毕。
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