如何在Swift 4中检测iPhone 7 Plus/X屏幕尺寸及OC代码转Swift 4？

Hey there! Let's walk through your two Swift 4 questions in detail—first detecting iPhone 7 Plus and iPhone X screen sizes, then converting your Objective-C code over.

To reliably identify these specific models, we'll use the nativeBounds property of UIScreen (this gives physical pixel dimensions, which are consistent for each device model, unlike point-based sizes that vary with scale factors).

• iPhone 7 Plus has a native screen height of 1920 pixels
• iPhone X has a native screen height of 2436 pixels

First, we'll confirm the device is an iPhone (not an iPad or other device) using UIDevice.current.userInterfaceIdiom, then check the native height. Here's the code:

import UIKit

func isIPhone7Plus() -> Bool {
    return UIDevice.current.userInterfaceIdiom == .phone 
        && UIScreen.main.nativeBounds.size.height == 1920
}

func isIPhoneX() -> Bool {
    return UIDevice.current.userInterfaceIdiom == .phone 
        && UIScreen.main.nativeBounds.size.height == 2436
}

// Example usage
if isIPhoneX() {
    print("This is an iPhone X")
} else if isIPhone7Plus() {
    print("This is an iPhone 7 Plus")
}

Your original Objective-C code checks for an iPhone X-sized screen, then initializes a YSLContainerViewController with child controllers, a top bar height, parent view controller, and delegate. Here's the clean Swift 4 equivalent:

import UIKit

// Assume controller1 through controller7 are already initialized UIViewController instances
if UIDevice.current.userInterfaceIdiom == .phone 
    && UIScreen.main.nativeBounds.size.height == 2436 {
    
    let containerVC = YSLContainerViewController(
        controllers: [controller1, controller2, controller3, controller4, controller5, controller6, controller7],
        topBarHeight: 276,
        parentViewController: self
    )
    containerVC.delegate = self // Replace with your delegate object if it's not `self`
    
    // Don't forget to add the container to your view hierarchy (example below)
    self.addChild(containerVC)
    view.addSubview(containerVC.view)
    containerVC.didMove(toParent: self)
}

Key conversion notes:

• [UIDevice currentDevice] becomes UIDevice.current in Swift
• UIUserInterfaceIdiomPhone simplifies to .phone
• UIScreen.mainScreen is now UIScreen.main
• Objective-C array literals @[...] become Swift's [...]
• The alloc/init pattern [[YSLContainerViewController alloc] initWithControllers:... is replaced with a direct initializer call
• Ensure your class conforms to the YSLContainerViewControllerDelegate protocol if setting delegate = self (you'll need to implement any required methods)

内容的提问来源于stack exchange，提问作者Appu Y