确定显示的视图是否已被推送或来自导航栏中的后退按钮

Question

有没有办法判断新控制器是来自导航后退按钮还是被推入堆栈？我想重新加载数据只是为了推送导航堆栈,而不是按下后退按钮.

Answer 1

从iOS 5.0开始,您可以这样做:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    if (self.isBeingPresented || self.isMovingToParentViewController) {
        // "self" is being shown for the 1st time, not because of a "back" button.
    }
}