Question

我以前曾提出过这个问题,但我越看其他守则的例子,我就越看到布局上的分歧。我通常在开始时(如果是制造型方法)或最后(如果是销毁型方法)(见下文。。。。。。)尝试发出这一呼吁。

-(void)viewDidLoad {
   [super viewDidLoad];
   。。。
   。。。
}

。

-(void)viewDidUnload {
   。。。
   。。。
   [super viewDidUnload];
}

The other method I see always seems to place the call to super at the end of the method regardless。 (see below。。。) my question is does it matter?

-(void)viewDidLoad {
   。。。
   。。。
   [super viewDidLoad];
}

。

-(void)viewDidUnload {
   。。。
   。。。
   [super viewDidUnload];
}

cheers gary。

Answer 1

d 我说,除非:

The method is doing initialisation of instance variables (which viewDidLoad usually wouldn t be doing, as that s the init method s job), in which case the super call should be at the start.
The method is doing deallocation of instance variables, in which case the super call should be at the end.
The method is passing on some sort of event, e.g. through a responder chain, in which case you wouldn t actually be using a super call at all (but the pattern is similar), and you d put the call at the end.

不过,我可能忽略了一些重要案件。