Prevents nsmutablearray from being initialized.

During project writing, we often encounter some depressing issues. When we add a model data to a variable array, we often find that the program runs normally, however, there is no data in the variable array. After a long time, I found that I always put an error, that is, nsmutablearray was not initialized, and then I got depressed ......

Today, we can see a good way to effectively prevent such low-level errors:

. H file

@ Interface modalcenter: nsobject

@ Property (nonatomic, retain) nsmutablearray * dogarray;
@ End

. M file

@ Implement modalcenter

-(Nsmutablearray *) dogarray

{

If (_ dogarray = nil) _ dogarray = [[nsmutablearray alloc] init];

Return _ dogarray;

 

}

@ End

Actually, it is to rewrite the getter method. When self. dogarray is used, it can avoid tragedy.

Prevents nsmutablearray from being initialized.