App 适配 iOS11 和 iPhone X

Posted on 2017-11-10 Edited on 2020-11-12 In iOS

Tutorial

遇到的问题

iOS 11 UINavigationItem.backBarItem 隐藏 “返回” 文字

iOS 11之前是通过

1	UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffset(horizontal: CGFloat.greatestFiniteMagnitude , vertical: 0), for: .default)

方法使 “返回” 文字隐藏的。但是在 iOS 11 中就不行了，而且导致 navigationbar 的 title 没见了，通过 debug 发现是因为设置了 CGFloat.greatestFiniteMagnitude 同时把 title 挤走了。

解决方案：

1	UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffset(horizontal: -CGFloat.greatestFiniteMagnitude , vertical: 0), for: .default)

iOS 11 UIBarButtonItem.width = -7 无效

http://blog.csdn.net/guo4114/article/details/78053025

采用 UIBarButtonItem(CustomView： Btn) 方式

iOS 11 UIScrollView contentInset 问题

替换成了 contentInsetAdjustmentBehavior

iOS 11 WKWebView contentInset 问题

https://stackoverflow.com/questions/45662388/ios-11-uiwebview-pop-down-by-status-bar

采用更改 frame 这种方式

iOS 11 自定义 Navigationbar 高度、透明度问题

import UIKit

class YYNavigationBar: UINavigationBar {

    // 更改 YYNavigationBar 背景 透明度
    var backgroundAlpha: CGFloat? {
        didSet {
            if let alpha = backgroundAlpha {
                if #available(iOS 11.0, *) {
                    self.subviews.forEach { (subview) in
                        if NSStringFromClass(type(of: subview)).contains("BarBackground") {
                            subview.alpha = alpha
                        }
                    }
                } else {
                    self.subviews.first?.alpha = alpha
                }
            }
        }
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        if #available(iOS 11.0, *) {
            self.subviews.forEach { (subview) in
                if NSStringFromClass(type(of: subview)).contains("BarBackground") {
                    subview.y = 0
                    subview.height = Constants.Layout.navBarHeight
                }
                if NSStringFromClass(type(of: subview)).contains("BarContentView") {
                    subview.y = Constants.Layout.statusBarHeight
                    subview.height = Constants.Layout.navBarHeight - Constants.Layout.statusBarHeight
                }
            }
        }
        
        if let alpha = backgroundAlpha {
            if #available(iOS 11.0, *) {
                self.subviews.forEach { (subview) in
                    if NSStringFromClass(type(of: subview)).contains("BarBackground") {
                        subview.alpha = alpha
                    }
                }
            } else {
                self.subviews.first?.alpha = alpha
            }
        }
        
    }

}

iOS11 UITableView 取消自动算高

if #available(iOS 11.0, *) {
    tableView.estimatedRowHeight = 0
    tableView.estimatedSectionHeaderHeight = 0
    tableView.estimatedSectionFooterHeight = 0
}

Swift 4内存访问安全

Simultaneous accesses to 0x10580, but modification requires exclusive access

http://www.jianshu.com/p/29d4c4b7ee88

UITableView Refresher 的 KVO 问题

可以参考 PullToRefresh 的 “Swift 4 and kvo” merge

适配 iPhone X 的一些变量

static var navBarY: CGFloat {
      switch UIDevice.current.kind {
      case .iPhoneX:
          return 20
      default:
          return 0
      }
  }
        
static var navBarHeight: CGFloat {
    switch UIDevice.current.kind {
    case .iPhoneX:
        return 88
    default:
        return 64
    }
}

static var tabBarHeight: CGFloat {
    switch UIDevice.current.kind {
    case .iPhoneX:
        return 83
    default:
        return 49
    }
}

static var statusBarHeight: CGFloat {
    switch UIDevice.current.kind {
    case .iPhoneX:
        return 44
    default:
        return 20
    }
}

static var adjustInsetForIPhoneX: UIEdgeInsets {
    switch UIDevice.current.kind {
    case .iPhoneX:
        return UIEdgeInsets(top: 0, left: 0, bottom: 34, right: 0)
    default:
        return UIEdgeInsets.zero
    }
}

Blog