在調用super之前/之後放置代碼viewDidLoad和viewWillAppear

Question

由於UIViewController中的關鍵字「did」和「will」，我不確定將代碼放在viewDidLoad和viewWillAppear中調用super之前/之後的位置，以便使代碼有效運行。

例如：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    // Code is here because whatever 
    // setup in super should been done first 
    // before we can do anything 
} 

- (void)viewWillAppear:(BOOL)animated 
{ 
    // Code should be here to finish 
    // whatever we want to do in our view 
    // before calling super 

    [super viewWillAppear:animated]; 
} 

這可以應用於didRotate和willRotate爲好。它是否正確？

Answer 1

這個答案看看從這裏 - What does [super viewWillAppear] do, and when is it required?viewwillappear待辦事宜和 - 當 - 是 - 它要求的

作爲一般規則，你應該總是調用[super viewWillAppear:animated]第一。