ios - Do I need a strongSelf in block to keep self alive and does the strongSelf really work? -

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This is what I learned: when using self block maintained

1. To break the need for a weakSelf need cycle
2. I have a strongSelf self We need to stop it from becoming zero half-way

So I want to test if any strong self actually self If you are alive:

  @implementation ViewController - (zero) viewDidoad {{Su But viewdload]; NSLog (@ "viewDidLoad"); Self.test = @ "" test "; NSLog (@"% @ ", self.test); __vek type (self) weak Self = self; dispatch_after (dispatch_time (DISPATCH_TIME_NOW, (int64_t) (3 * NSEC_PER_SEC)), dispatch_get_main_queue (), ^ {__strong typeof (weakSelf) strongSelf = weakSelf; strongSelf.test = @ "newTest"; NSLog (@ "% @", strongSelf. tests);});} - (void) {Delok Anselog (@ " Delok ");} @ end  

View controller will be pushed into a navigation controller and the output will immediately pop out

Why is it null?

Another question is, I have a project In indicating block are weak themselves strongSelf tones without me enough to indicate 11 accident related? To add worth it strongSelf For each of them?