Ios 视图控制器'；s视图'；s属性

我正在为一个专用计算器开发接口，在IB中有以下设置：

我使用了IB中的“容器视图”，并将其设置为与我的自定义视图控制器“ButtonViewController”相等

然后，在ButtonViewController.m文件中，我有以下内容：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor colorWithRed: 0.75 green: 0.0 blue: 0.0 alpha: 1.0 ];
    NSLog(@"self.view.bounds.size.width:\t%f", self.view.bounds.size.width);
    NSLog(@"self.view.bounds.size.height:\t%f", self.view.bounds.size.height);

    NSLog(@"self.view.frame.size.width:\t%f", self.view.frame.size.width);
    NSLog(@"self.view.frame.size.height:\t%f", self.view.frame.size.height);
}

我得到以下屏幕输出：

和以下控制台输出：

self.view.bounds.size.width:    320.000000
self.view.bounds.size.height:   460.000000
self.view.frame.size.width:     320.000000
self.view.frame.size.height:    460.000000

Interface Builder声明“容器”的宽度为280px，高度为364px，因此出于某种原因，我没有得到正确的值

我甚至试图找到

super

的

bounds

和

frame

维度，但结果仍然是320x460

有人能告诉我我做错了什么吗

提前谢谢

[更新]

只是为其他人提供一些信息： 我使用类似的UI控件进行了一些测试，我发现： （

cvObject

是一个

UICollectionView

对象）

我得到的是：

-[FPViewController viewDidLoad]: self.cvObject.bounds:  {{0, 0}, {0, 0}}
-[FPViewController viewDidLoad]: self.cvObject.frame:   {{0, 0}, {0, 0}}
-[FPViewController viewWillAppear:]: self.cvObject.bounds:  {{0, 0}, {0, 0}}
-[FPViewController viewWillAppear:]: self.cvObject.frame:   {{0, 0}, {0, 0}}
-[FPViewController viewWillLayoutSubviews]: self.cvObject.bounds:   {{0, 0}, {0, 0}}
-[FPViewController viewWillLayoutSubviews]: self.cvObject.frame:    {{0, 0}, {0, 0}}
-[FPViewController viewDidLayoutSubviews]: self.cvObject.bounds:    {{0, 0}, {280, 312}}
-[FPViewController viewDidLayoutSubviews]: self.cvObject.frame: {{20, 128}, {280, 312}}
-[FPViewController viewDidAppear:]: self.cvObject.bounds:   {{0, 0}, {280, 312}}
-[FPViewController viewDidAppear:]: self.cvObject.frame:    {{20, 128}, {280, 312}}

---

因此，您可以看到，只有在视图布局其子视图之后，它才能确定对象的帧和边界。

您应该在

视图中重新检查这些值，然后您会发现在那里可以看到正确的值：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor colorWithRed: 0.75 green: 0.0 blue: 0.0 alpha: 1.0 ];

    // frame and bounds are not entirely reliable at this point

    NSLog(@"%s: self.view.bounds:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.bounds));
    NSLog(@"%s: self.view.frame:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.frame));
}

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

    // frame and bounds have generally been updated correctly by this point

    NSLog(@"%s: self.view.bounds:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.bounds));
    NSLog(@"%s: self.view.frame:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.frame));
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor colorWithRed: 0.75 green: 0.0 blue: 0.0 alpha: 1.0 ];

    // frame and bounds are not entirely reliable at this point

    NSLog(@"%s: self.view.bounds:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.bounds));
    NSLog(@"%s: self.view.frame:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.frame));
}

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

    // frame and bounds have generally been updated correctly by this point

    NSLog(@"%s: self.view.bounds:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.bounds));
    NSLog(@"%s: self.view.frame:\t%@", __FUNCTION__, NSStringFromCGRect(self.view.frame));
}