A.建立連接,形成傳輸數(shù)據(jù)的通道。 B.將數(shù)據(jù)及源和目的封裝成數(shù)據(jù)包中,不需要建立連接。 C.傳播速度快。 D.不可靠協(xié)議
A.-(instancetype)initWithTarget:(id)target selector:(SEL)selector object:(id)argument B.+(void)detachNewThreadSelector:(SEL)selector to Target:(id)target with Object:(id)argument; C.-(void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg;正 D.+(NSThread*)mainThread;
A.willHideViewController: B.willShowViewController: C.shouldHideViewController: D.willPresentViewController: