为什么就变成4了呢？求大神解决！

Question

我在调用手机自带相机的时候出现了内存泄露，代码如下

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.allowsEditing = NO;    if (sender.tag == 1)
    {
        [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
    }    else
    {
        [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    }
    [imagePicker setDelegate:self];        NSLog(@"picker retaincount1 %i",[imagePicker retainCount]);
    [self presentModalViewController:imagePicker animated:YES];        NSLog(@"picker retaincount2 %i",[imagePicker retainCount]);

控制台输出的是

picker retaincount1 1picker retaincount2 4

Answer 1

这很正常，presentModalViewController这个方法会retain传给它的view controller参数，至于retain几次，跟它内部具体实现相关。开发者没必要关心这些，只要你保证自己主动调用的alloc和release相匹配就可以了，剩下的交给系统去处理。