Assigning retained object to weak property object will be released after assignment

在ARC中，如果添加了weak的属性。初始化了相关的object然后给这个属性赋值的时候就会看到Xcode给出这个提示。

这个时候可以这么处理：在别的地方已经retain这个object的引用。

@property (nonatomic, weak) KGModalContainerView *containerView;
...
-(void)viewDidLoad {
    [super viewDidLoad];
    KGModalContainerView *myContainerView = [[KGModalContainerView alloc] initWithFrame:containerViewRect]; // This is a strong reference to that view
    [self.view addSubview:myContainerView]; //Here self.view retains myContainerView
    self.containerView = myContainerView; // Now self.containerView has weak reference to that view, but if your self.view removes this view, self.containerView will automatically go to nil.

 // In the end ARC will release myContainerView, but it's retained by self.view and weak referenced by self.containerView
}

在这个例子中，先初始化了ContainerView。然后把这个View放到self.view的子View中，也就是retain了ContainerView。

然后再把ContainerView赋值给weak属性里。

各位都知道了吧。