iOS开发记录点

1、可以预热加载控制器，后面进去控制器会快；

2、UICollectionView当前显示最小和最大index:

guard let minIndex = collectionView.indexPathsForVisibleItems.min() else { return }

guard let maxIndex = collectionView.indexPathsForVisibleItems.max() else { return }

3、添加多个视图：

view.addSubviews([bgImageView,bottomView,topBarView,topPotView,topOtherPotView,topMaterialView,bottomPotCountView,bottomHistoryView,personView,personViewTemp,tipsView,sigleView,doubleView,fourView,bottomSureView,sureView,doneView,levelView])

4、extension写法：

@objc private
extension MYViewController {

}

5、iOS多状态多用enum

6、获取gif文件：

extension URL {
    static func gif(name: String) -> URL? {
        guard let bundleURL = Bundle.main
            .url(forResource: name, withExtension: "gif") else {
                print("SwiftGif: This image named \"\(name)\" does not exist")
                return nil
        }
        return bundleURL
    }
}

7、通知的分类：

extension Notification.Name {
  public static let showHistoryPotDetail = Notification.Name("XXX")
}

8、好用的第三方:

  pod 'Spring', :git => 'https://github.com/MengTo/Spring.git'
  pod 'SwifterSwift'