navigation push和popviewcontroller dealloc问题

申高卓
2023-12-01

事件,在instruments检查内存泄漏时发现其中一个viewcontroller在navigation做pop操作后未做dealloc,导致内存泄漏

push操作代码如下:

    ViewController_leaveAMessage *leaveMessage = [[ViewController_leaveAMessage alloc]initWithNibName:@"ViewController_leaveAMessage" bundle:nil];

    leaveMessage.toId = self.friendRS.userId;

    [self.navigationController pushViewController:leaveMessage animated:YES];

    [leaveMessage release];


pop操作后viewcontroller记述理应为0,从而调用dealloc。但是这断点后发现pop后未调用dealloc,说明该viewcontroller在其他地方还有引用。可是冲上面代码看出,正常情来说不该出该问题。后在push操作前后加log查看retainCount,发现该viewcontroller在push后retainCount增加了6,push其他viewcontroller其retainCount仅增加5.

其后逐条删除该viewcontroller中得viewdidload方法中得代码发现,其中因在viewdidload中执行

    timer = [NSTimer scheduledTimerWithTimeInterval:0.3 target:selfselector:@selector(showLblTimeRecorderOrPlayer) userInfo:nil repeats:YES];

导致该viewcontroller得retainCount在push操作后多加 1 。         总:timer应在pop前 invalidate。navigation得push操作在操作中就会执行相应viewcontroller得viewdidiload。
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