ペン先を介して初期化されているカスタムUIViewサブクラスがあります。
で-awakeFromNib
、サブビューを作成し、そのスーパービューの中央に配置しようとしています。
[self setInteralView: [[UIView alloc] init]];
[[self internalView] addConstraint: [NSLayoutConstraint constraintWithItem: [self internalView]
attribute: NSLayoutAttributeCenterX
relatedBy: NSLayoutRelationEqual
toItem: self
attribute: NSLayoutAttributeCenterX
multiplier: 1
constant: 0]];
これが壊れて、次の出力が発生します。
2013-08-11 17:58:29.628 MyApp[32414:a0b] The view hierarchy is not prepared for the constraint: <NSLayoutConstraint:0xc1dcc80 UIView:0xc132a40.centerX == MyView:0xc1315a0.centerX>
When added to a view, the constraint's items must be descendants of that view (or the view itself). This will crash if the constraint needs to be resolved before the view hierarchy is assembled. Break on -[UIView _viewHierarchyUnpreparedForConstraint:] to debug.
2013-08-11 17:58:29.630 MyApp[32414:a0b] View hierarchy unprepared for constraint.
Constraint: <NSLayoutConstraint:0xc1dcc80 UIView:0xc132a40.centerX == MyView:0xc1315a0.centerX>
Container hierarchy:
<UIView: 0xc132a40; frame = (0 0; 0 0); clipsToBounds = YES; layer = <CALayer: 0xc132bc0>>
View not found in container hierarchy: <MyView: 0xc1315a0; frame = (-128 -118; 576 804); layer = <CALayer: 0xc131710>>
That view's superview: <UIView: 0xc131a70; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0xc131b50>>
Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want.
そしてそれは壊れます<NSLayoutConstraint:0x126ad4c0 UIView:0xadd2e20.centerX == MyView:0xadd19b0.centerX>