我对objective-c中的块还是陌生的,想知道我的伪代码是否正确。我不确定仅删除观察者是否足够,或者我是否必须调用 removeObserver:name:object:
-(void) scan {
Scanner *scanner = [[Scanner alloc] init];
id scanComplete = [[NSNotificationCenter defaultCenter] addObserverForName:@"ScanComplete"
object:scanner
queue:nil
usingBlock:^(NSNotification *notification){
/*
do something
*/
[[NSNotificationCenter defaultCenter] removeObserver:scanComplete];
[scanner release];
}];
[scanner startScan];
}
更新:我EXC_BAD_ACCESS
从这个街区收到断断续续的消息,所以这是不对的。