Ios should not add self

After two days of struggle, I finally found the cause!

Error: NSArray array. Passed through @ property (nonatomic, copy) and @ synthesize.

In the class initialization method, assign array = [result objectForKey: @ "list"] to the array;

Print array: NSLog (@ "array is % @", array); the result is normal.

Then, the array is used as the tableview data source, and the problem persists.

-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section {
If (array! = Nil ){

NSLog (@ "array is % @", array );
Return [array count];
} Else {
Return 1;
}
}

An error is reported when printing.

Then a retain is added to the array assignment statement, and the problem is solved.

Array = [[result objectForKey: @ "list"] retain] or add self.

Self. array = [result objectForKey: @ "list.

Therefore, when you call the self. member variable, the retain of this member variable will add 1. Remember.

Therefore, code like self. A = [A alloc] init] may crash.