我正在使用CocoaPods框架和UIApplication。shared不可用，然后我在视图窗口中使用safeAreaInsets:

if #available(iOS 11.0, *) {
    let insets = view.window?.safeAreaInsets
    let top = insets.top
    let bottom = insets.bottom
}

要获得布局参考线之间的高度，只需这样做

let guide = view.safeAreaLayoutGuide
let height = guide.layoutFrame.size.height

所以全帧高度= 812.0，安全区高度= 734.0

下面的例子中，绿色视图的框架为guide.layoutFrame

试试这个:

在Objective C中

if (@available(iOS 11.0, *)) {
    UIWindow *window = UIApplication.sharedApplication.windows.firstObject;
    CGFloat topPadding = window.safeAreaInsets.top;
    CGFloat bottomPadding = window.safeAreaInsets.bottom;
}

在斯威夫特

if #available(iOS 11.0, *) {
    let window = UIApplication.shared.keyWindow
    let topPadding = window?.safeAreaInsets.top
    let bottomPadding = window?.safeAreaInsets.bottom
}

在Swift - iOS 13.0及以上

//使用windows数组中的第一个元素，KeyWindow已弃用

if #available(iOS 13.0, *) {
    let window = UIApplication.shared.windows.first
    let topPadding = window.safeAreaInsets.top
    let bottomPadding = window.safeAreaInsets.bottom
}

UIWindow *window = [[[UIApplication sharedApplication] delegate] window]; 
CGFloat fBottomPadding = window.safeAreaInsets.bottom;

对于 SwiftUI：

Code

private struct SafeAreaInsetsKey: EnvironmentKey {
    static var defaultValue: EdgeInsets {
        UIApplication.shared.windows[0].safeAreaInsets.insets
    }
}

extension EnvironmentValues {
    
    var safeAreaInsets: EdgeInsets {
        self[SafeAreaInsetsKey.self]
    }
}

private extension UIEdgeInsets {
    
    var insets: EdgeInsets {
        EdgeInsets(top: top, leading: left, bottom: bottom, trailing: right)
    }
}

使用

struct MyView: View {
    
    @Environment(\.safeAreaInsets) private var safeAreaInsets
    
    var body: some View {
        Text("Ciao")
            .padding(safeAreaInsets)
    }
}

斯威夫特4

if let window = UIApplication.shared.windows.first {
    
    let topPadding = window.safeAreaInsets.top
    let bottomPadding = window.safeAreaInsets.bottom
    
}

从课堂使用

class fitToTopInsetConstraint: NSLayoutConstraint {
    
    override func awakeFromNib() {
        
        if let window = UIApplication.shared.windows.first {
            
            let topPadding = window.safeAreaInsets.top
            
            self.constant += topPadding
            
        }
        
    }
}

class fitToBottomInsetConstraint: NSLayoutConstraint {
    
    override func awakeFromNib() {
        
        if let window = UIApplication.shared.windows.first {
            
            let bottomPadding = window.safeAreaInsets.bottom
            
            self.constant += bottomPadding
            
        }
        
    }
}

在构建应用程序时，您将看到安全区域填充。