Xcode 8-自动版式问题 [英] Xcode 8 - Autolayouts Issue

问题描述

我正在使用新的Xcode设置基本的UIView子类，并且遇到了奇怪的行为.乍一看，该子类视图似乎可以正常加载:

I am setting up basic UIView subclass with the new Xcode and came across weird behaviour. The subclassed view appears to load normally at the first glance:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
        if (self) {
            [self baseInit];
}
    return self;
}
- (void)awakeFromNib
{
    [super awakeFromNib];
    [self baseInit];
}

我开始在自己拥有的iPhone 6大小的情节提要中构建另一个容器视图.我的布局有点复杂，只有很少的对象，即使我擅长设置约束，它也发生了变化.

I started to build another container view in storyboards set to size of iPhone 6 as I own one. I had a bit complicated layout with quite few objects and even if I am good at setting constrains, it came out shifted.

因此，我开始尝试使用简单视图，以查看Xcode升级后问题出在哪里.

So I started to experiment with simple view, to see where the problem is after the Xcode upgrade.

使用2个UIView进行简单练习.

Simple exercise with 2 UIViews.

每个限制的首选项设置都设置为1000，设备设置为iPhone 6s.

The preference setting was set to 1000 to each constrain and device was set to iPhone 6s.

但是iPhone 6/s或我的设备iPhone 6上的结果发生了变化:

But the result on iPhone 6/s or my device iPhone 6 is shifted:

因此，当我开始摆弄时，我发现如果将情节提要设备设置为iPhone SE，它将在iPhone 6模拟器和iPhone 6设备上正确显示内容:

So when I started to fiddle around, I have discovered that if set the storyboard device to iPhone SE, it will show the content correctly on both, iPhone 6 simulator and iPhone 6 device:

设置错误，现在已经对齐.我是否错过了新的Xcode版本中的内容以及如何使用自动布局和约束?

Wrong setting and now it's aligned. Have I missed something in the new Xcode version and how to work with autolayouts and constrains?

谢谢 答:

推荐答案

如果baseInit使用UIView和帧大小进行任何操作，则应在viewDidLayoutSubviews内部调用它.根据视图的约束对视图进行布局后，将调用此方法.

If baseInit is doing anything with UIViews and frame sizes you should call it inside viewDidLayoutSubviews. This is called after the view has been laid-out according to the view's constraints.

static dispatch_once_t oncePerLoadToken;

- (void)viewDidLoad {
    [super viewDidLoad];
    oncePerLoadToken = 0;
}

- (void)viewDidLayoutSubviews {
    dispatch_once(&oncePerLoadToken, ^{
        [self baseInit];
    });
}

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