Question

我有一个XIB视图。

当我将它添加到我的视图中时，我希望宽度和高度适合iOS设备。

然而，它并不合适。

如果我使用自动布局，它将适合屏幕。但我该如何使用呢？

在下面的代码示例中，它采用XIB文件的Bounds。因此它不适合视图。我该如何解决这个问题？

-(id)initWithFrame:(CGRect)frame{

    self = [super initWithFrame:frame];

    if (self) {

        self.myView=[[[NSBundle mainBundle] loadNibNamed:@"MyView" owner:self options:nil] lastObject];

        self.bounds=self.myView.bounds;

        [self addSubview:self.myView];

    }

    return self;

}

Answer 1

加载您的视图，然后

    [_subview setTranslatesAutoresizingMaskIntoConstraints:NO];
    [_contentView addSubview:_subview];
    [self activateConstraintsForView:_subview respectToParentView:_contentView];

使用此功能：

- (void)activateConstraintsForView:(UIView *)view respectToParentView:(UIView *)parentView
{

    NSLayoutConstraint *bottomConstraint = [NSLayoutConstraint constraintWithItem:view
                                                                    attribute:NSLayoutAttributeBottom
                                                                    relatedBy:NSLayoutRelationEqual
                                                                       toItem:parentView
                                                                    attribute:NSLayoutAttributeBottom
                                                                   multiplier:1.0
                                                                     constant:0];

    NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:view
                                                                 attribute:NSLayoutAttributeTop
                                                                 relatedBy:NSLayoutRelationEqual
                                                                    toItem:parentView
                                                                 attribute:NSLayoutAttributeTop
                                                                multiplier:1.0
                                                                  constant:0];

    NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:view
                                                                  attribute:NSLayoutAttributeLeft
                                                                  relatedBy:NSLayoutRelationEqual
                                                                     toItem:parentView
                                                                  attribute:NSLayoutAttributeLeft
                                                                 multiplier:1.0
                                                                   constant:0];

    NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:view
                                                                   attribute:NSLayoutAttributeRight
                                                                   relatedBy:NSLayoutRelationEqual
                                                                      toItem:parentView
                                                                   attribute:NSLayoutAttributeRight
                                                                  multiplier:1.0
                                                                    constant:0];

    [NSLayoutConstraint activateConstraints:[NSArray arrayWithObjects:topConstraint, leftConstraint, bottomConstraint, rightConstraint, nil]] ;
 }

希望，这有帮助。

Answer 2

在你的initWithFrame方法中，最后添加：

[self setConstraintsOfView:self.myView withRespectToParentView:self];

在课程结束时添加以下方法：

-(void)setConstraintsOfView:(UIView *)subView withRespectToParentView:(UIView *)parentView
{
    NSDictionary *viewsDictionary = @{@"subView":subView};

    NSDictionary *metrics =@{@"offset":@0};

    NSArray *heightConstraint = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-offset-[subView]-offset-|"
                                                                        options:0
                                                                        metrics:metrics
                                                                          views:viewsDictionary];

    NSArray *widthConstraint = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-offset-[subView]-offset-|"
                                                                       options:0
                                                                       metrics:metrics
                                                                         views:viewsDictionary];

    [parentView addConstraints:heightConstraint];

    [parentView addConstraints:widthConstraint];
}

VFL比设置每个约束容易得多。此方法相对于superview设置子视图的top，bottom，leading和trailing space = 0。

我认为你想实现这个目标： https://github.com/PrajeetShrestha/ConstraintTest

XIB视图具有较大的边界值，不适合屏幕

2 个答案: