Check whether or not the current thread is the main thread
Have a look at the NSThread API documentation.
There are methods like
- (BOOL)isMainThread
+ (BOOL)isMainThread
and + (NSThread *)mainThread
In Swift3
if Thread.isMainThread { print("Main Thread")}
If you want a method to be executed on the main thread, you can:
- (void)someMethod{ dispatch_block_t block = ^{ // Code for the method goes here }; if ([NSThread isMainThread]) { block(); } else { dispatch_async(dispatch_get_main_queue(), block); }}