从 xib 文件加载的自动调整视图大小

Posted 2023-02-27

【中文标题】从 xib 文件加载的自动调整视图大小

【英文标题】：autoresizing view loaded from xib file

【发布时间】：2014-05-14 07:56:56

【问题描述】：

我的项目中有以下 Xib 文件：

我尝试向提示视图添加一些新的约束（超级视图的底部、顶部、左侧和右侧空间），但是从界面生成器中这是不可能的，如图所示。应该怎么做？

对应函数：

+ (instancetype)presentInViewController:(UIViewController *)viewController withDefaultsKey:(NSString *)defaultsKey 
    ELHintViewOwner *owner = [ELHintViewOwner new];
    NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:owner options:nil];
    //hintViewOwner.decoupledView.delegateViewController = viewController
    ELHintView *hintView = [bundle firstObject];
    hintView.frame = viewController.view.bounds;
    hintView.titleLabel.text = @"";
    hintView.defaultsKey = defaultsKey;
    hintView.tapAnywhereLabel.text = NSLocalizedString(@"Tap anywhere to continue", nil);
    hintView.showLabel.text = NSLocalizedString(@"Don't show this message again", nil);
    hintView.imageView.hidden = YES;
    hintView.showSwitch.on = ![[[NSUserDefaults standardUserDefaults] valueForKey:defaultsKey]  boolValue];

    if ([hintView shouldShow])
        [viewController.view addSubview:owner.decoupledView];
    return hintView;

【问题讨论】：

您尝试向哪个视图添加约束，hintView 或 owner.decoupledView ？

我以为两者都一样

是的。它们是相同的：snag.gy/nG4QD.jpg

【参考方案1】：

如果要将超级视图添加到其他视图，则必须在代码中添加自动布局约束。

+ (instancetype)presentInViewController:(UIViewController *)viewController withDefaultsKey:(NSString *)defaultsKey 
    ELHintViewOwner *owner = [ELHintViewOwner new];
    NSArray *bundle = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:owner options:nil];
    //hintViewOwner.decoupledView.delegateViewController = viewController
    ELHintView *hintView = [bundle firstObject];
    hintView.frame = viewController.view.bounds;
    hintView.titleLabel.text = @"";
    hintView.defaultsKey = defaultsKey;
    hintView.tapAnywhereLabel.text = NSLocalizedString(@"Tap anywhere to continue", nil);
    hintView.showLabel.text = NSLocalizedString(@"Don't show this message again", nil);
    hintView.imageView.hidden = YES;
    hintView.showSwitch.on = ![[[NSUserDefaults standardUserDefaults] valueForKey:defaultsKey]  boolValue];

    if ([hintView shouldShow])
        [viewController.view addSubview:owner.decoupledView];
          hintView.translatesAutoresizingMaskIntoConstraints = NO;
          NSArray *constraintsX = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[hintView]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(hintView)];
          NSArray *constraintsY = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[hintView]|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(hintView)];
          [viewController.view addConstraints:constraintsX];
          [viewController.view addConstraints:constraintsY];
     
    return hintView;

【讨论】：

还有其他方法吗？我尝试在界面生成器中做尽可能多的事情。