我有以下问题：我已经在XIB文件中创建了一个自定义的UIView类及其布局.让我们说XIB中的自定义视图的大小是150 x 50.我已经启用了sizeClasses(wAny hAny)和AutoLayout.在模拟指标中,我设置了Size = Freeform,Status Bar = None,all other = Inferred.

我的自定义UIView类的代码如下所示：

#import "CustomView.h"

@implementation CustomView

#pragma mark - Object lifecycle

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

    if (self) {
        [self setup];
    }

    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];

    if (self) {
        [self setup];
    }

    return self;
}

#pragma mark - Private & helper methods

- (void)setup {
    if (self.subviews.count == 0) {
        [[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:self options:nil];
        self.bounds = self.view.bounds;
        [self addSubview:self.view];
    }
}

@end

在我想要添加这个自定义UIView的UIViewController中,我已经创建了虚拟UIView(我在Interface Builder中设置了大小),我想添加我的CustomView,我希望我的CustomView适合我的容器视图的边界.

我正试图这样做：

_vCustomView = [[CustomView alloc] init];
_vCustomView.translatesAutoresizingMaskIntoConstraints = NO;
[_vContainer addSubview:_vCustomView];

[_vContainer addConstraint:[NSLayoutConstraint constraintWithItem:_vCustomView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:_vContainer attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0]];
[_vContainer addConstraint:[NSLayoutConstraint constraintWithItem:_vCustomView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:_vContainer attribute:NSLayoutAttributeRight multiplier:1.0 constant:0.0]];
[_vContainer addConstraint:[NSLayoutConstraint constraintWithItem:_vCustomView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:_vContainer attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0]];
[_vContainer addConstraint:[NSLayoutConstraint constraintWithItem:_vCustomView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:_vContainer attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];

但没有运气.假设我的容器视图是300 x 100,当我添加自定义UIView时,我的自定义视图仍然是150 x 50.

我试图在没有容器视图的情况下工作 – 将我的自定义UIView对象直接添加到我的UIViewController的self.view中,并将其宽度和高度设置为：

> autoLayout约束
>在初始化我的自定义UIView时使用initWithFrame

但再次 – 没有运气.自定义视图始终为150 x 50.

有人可以向我解释如何以编程方式添加我在XIB中制作的自定义UIView,并使用autoLayout约束调整大小？

提前谢谢了.

编辑#1：尝试在我的CustomView上运行Andrea的代码时遇到错误

Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand,refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x17489b760 V:[UIView:0x17418d820(91)]>","<NSLayoutConstraint:0x170c9bf80 V:|-(0)-[CustomView:0x1741da7c0]   (Names: '|':CustomView:0x1741da8b0 )>","<NSLayoutConstraint:0x170c9bfd0 V:[CustomView:0x1741da7c0]-(0)-|   (Names: '|':CustomView:0x1741da8b0 )>","<NSLayoutConstraint:0x170c9be90 V:|-(0)-[CustomView:0x1741da8b0]   (Names: '|':UIView:0x17418d820 )>","<NSLayoutConstraint:0x170c9bee0 CustomView:0x1741da8b0.bottom == UIView:0x17418d820.bottom>","<NSAutoresizingMaskLayoutConstraint:0x170c9dba0 h=--& v=--& CustomView:0x1741da7c0.midY == + 25.0>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170c9bfd0 V:[CustomView:0x1741da7c0]-(0)-|   (Names: '|':CustomView:0x1741da8b0 )>

编辑#2：它的作品！

之后@Andrea补充说：

view.translatesAutoresizingMaskIntoConstraints = NO;

在他的：

- (void) stretchToSuperView:(UIView*) view;

方法,一切都像我所料.

感谢@Andrea.

- (void) stretchToSuperView:(UIView*) view {
    view.translatesAutoresizingMaskIntoConstraints = NO;
    NSDictionary *bindings = NSDictionaryOfVariableBindings(view);
    NSString *formatTemplate = @"%@:|[view]|";
    for (NSString * axis in @[@"H",@"V"]) {
        NSString * format = [NSString stringWithFormat:formatTemplate,axis];
        NSArray * constraints = [NSLayoutConstraint constraintsWithVisualFormat:format options:0 metrics:nil views:bindings];
        [view.superview addConstraints:constraints];
    }

}

- (void)setup {
    if (self.subviews.count == 0) {
        [[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:self options:nil];
        self.bounds = self.view.bounds;
        [self addSubview:self.view];
        [self stretchToSuperView:self.view];
    }
}