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我按照此链接https://www.appcoda.com/uipageviewcontroller-storyboard-tutorial/创建了一个带有“PageControl”的“PageViewController”，而不是在页面控件底部添加按钮。我想在页面控件的左侧和右侧添加 2 个按钮。

问题 我设法使用以下代码添加按钮，但约束已失效。我想尝试在 Storyboard 中设置它，但不确定我应该在哪里设置。请帮忙。

@implementation RootViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    _pageTitles = @[@"", @"", @""];
    _pageImages = @[@"4.png", @"5.png", @"4.png"];

    // Create page view controller
    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;

    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    btnLogin = [[UIButton alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height-30, self.view.frame.size.width/4, 20)];

    btnLogin.backgroundColor = [UIColor colorWithRed:19.0f/255.0f green:147/255.0f blue:182.0f/255.0f alpha:1.0];//%%% buttoncolors
    [btnLogin setTitle:@"LOGIN" forState:UIControlStateNormal];
    [btnLogin addTarget:self action:@selector(btnLoginClicked:) forControlEvents:UIControlEventTouchUpInside];

    btnRegister = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width-((self.view.frame.size.width/4)),self.view.frame.size.height-30, self.view.frame.size.width/4, 20)];

    btnRegister.backgroundColor = [UIColor colorWithRed:19.0f/255.0f green:147/255.0f blue:182.0f/255.0f alpha:1.0];//%%% buttoncolors
    [btnRegister setTitle:@"REGISTER" forState:UIControlStateNormal];
    [btnRegister addTarget:self action:@selector(btnRegisterClicked:) forControlEvents:UIControlEventTouchUpInside];

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.view addSubview:btnLogin];
    [self.view addSubview:btnRegister];

    [self.pageViewController didMoveToParentViewController:self];

}

苹果六号还行 苹果六

Iphone XSMax 不受约束 iphone XSMax

故事板 在此处输入图像描述

尝试 OnkarK 的以下解决方案 

 UIWindow *window = UIApplication.sharedApplication.keyWindow;
 CGFloat bottomPadding = window.safeAreaInsets.bottom;

 // Change the size of page view controller
 self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

 btnLogin = [[UIButton alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height-30-bottomPadding, self.view.frame.size.width/4, 20)];

**我得到了以下内容，但如何摆脱空白**

白色空间

感谢@phani，这确实是约束问题，必须始终约束到 SuperView，希望将来能对某人有所帮助

解决方案

4

1 回答 1

1

当您以编程方式添加按钮时，您需要在设置框架时考虑安全区域。尝试这个：

UIWindow *window = UIApplication.sharedApplication.keyWindow;
CGFloat bottomPadding = window.safeAreaInsets.bottom;
btnLogin = [[UIButton alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height-30-bottomPadding, self.view.frame.size.width/4, 20)];
于 2019-02-13T04:04:45.513 回答