我有以下代码:
- (IBAction)mapPressed:(id)sender
{
MapViewController *mapVC = [[MapViewController alloc] initWithNibName:@"MapViewController" bundle:[NSBundle mainBundle]];
mapVC.delegate = self;
[self.navigationController pushViewController:mapVC animated:YES];
}
对于 MapViewController:
//MapViewController.h
@protocol MapViewDelegate
@required
- (void)selectedPlacemark:(MKPlacemark*)placemark;
@end
//...
@property (nonatomic, weak) id<MapViewDelegate> delegate;
//...
如果启用了 ARC,我还需要将 mapVC.delegate 设置为 nil 吗?如果是这样,这是否意味着我不应该在本地创建 MapViewController 而是为对象设置一个实例变量?