ViewController的高度設置不正確

Question

我只是沒有得到我的視圖控制器的權利設置。我已經實現到另一個ViewController中像這樣的視圖控制器：

家長的ViewController：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     [self addTopTabBarController]; 
    } 
    return self; 
} 

- (void)addTopTabBarController { 
    self.topTapController = [[TopBarViewController alloc] init]; 
    [self addChildViewController:self.topTapController]; 
    [self.topTapController didMoveToParentViewController:self]; 
    [self.view addSubview:self.topTapController.view]; 
    self.topTapController.view.frame = CGRectMake(0, 200, 320, 40); 
} 

兒童的viewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 

     // Setup toolbar an set frame 
     self.toolbar = [[UIToolbar alloc] init]; 
     NSLog(@"%f", self.view.frame.size.height); 

    } 
    return self; 
} 

當我登錄了frame.size.height，我得到568.0作爲回報值。爲什麼我之前沒有在父級ViewController中設置返回40？我是否返回了錯誤的財產？

Answer 1

嘗試NSLog在viewWillAppear方法。

您只能獲得該視圖的尺寸viewWillAppear