无法在 iOS6 中使用启用的故事板自动布局执行自定义 UIButton

Can#39;t do custom UIButton in iOS6 with enabled storyboard autolayout(无法在 iOS6 中使用启用的故事板自动布局执行自定义 UIButton)

问题描述

我遇到了奇怪的行为.我正在使用我在控制器中设置的自定义样式按钮:

I faced strange behavior. I'm using custom styled button which I setup in my controller:

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self.signOutButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [self.signOutButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];

    CAGradientLayer *btnGradient = [CAGradientLayer layer];
    btnGradient.frame = self.signOutButton.bounds;
    btnGradient.colors = [NSArray arrayWithObjects:
                          (id)[[UIColor colorWithRed:102.0f / 255.0f green:102.0f / 255.0f blue:102.0f / 255.0f alpha:1.0f] CGColor],
                          (id)[[UIColor colorWithRed:51.0f / 255.0f green:51.0f / 255.0f blue:51.0f / 255.0f alpha:1.0f] CGColor],
                          nil];

    [self.signOutButton.layer insertSublayer:btnGradient atIndex:0];
}

它在 iOS 5 中运行良好.但如果我为 iOS 6 构建这个并启用了 Storyboard 的自动布局，那么我的样式中的渐变会消失/变得透明(但标题仍然可见).

It works OK in iOS 5. But if I'm building this for iOS 6 with enabled Autolayout for Storyboard then gradient in my style disappears/becomes transparent (but title is still visible).

如果我禁用自动布局 - 渐变又回来了.有人可以用自动布局来解释这种行为吗?

If I'm disabling autolayout - gradient is back. Could somebody explain such behavior with autolayout?

推荐答案

在viewDidLoad中，在autolayout下，你的views还没有框架，所以你让layer有一个CGRectZero的框架.

In viewDidLoad, under autolayout, your views will not yet have a frame, so you are making the layer have a frame of CGRectZero.

您需要将此代码或至少将设置渐变层框架的部分移动到 viewDidLayoutSubviews 或类似内容.

You need to move this code, or at least the part where you set the frame of the gradient layer, to viewDidLayoutSubviews or similar.

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