performSelector withObject afterDelay 在子线程上调用不运行

Objective-c代码  

1. [self performSelector:(nonnull SEL) withObject:(nullable id) afterDelay:(NSTimeInterval)];  

Objective-c代码  

1. [[NSRunLoop currentRunLoop] run];  

Objective-c代码  

1. - (void)functionToDelay:(SEL)function param:(nullable id)param afterDelay:(NSTimeInterval)delay {  
2.     dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay*NSEC_PER_SEC);  
3.     dispatch_after(time, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  
4.         if ([self respondsToSelector:function]) {  
5. #pragma clang diagnostic push  
6. #pragma clang diagnostic ignored "-Warc-performSelector-leaks"  
7.         [self performSelector:function withObject:param];  
8. #pragma clang diagnostic pop  
9.   
10.         }  
11.     });     
12. }  

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