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iOS 10 总结

iOS 10 总结

作者: 深藏不露的zack | 来源:发表于2016-11-30 10:06 被阅读0次

    iiOS10添加了新的权限控制范围 如果你尝试访问这些隐私数据时得到如下错误:

    > This app has crashed because it attempted to access privacy-sensitive

    > data without a usage description.  The app's Info.plist must contain

    > an NSCameraUsageDescription key with a string value explaining to the

    > user how the app uses this data

    因为它企图访问敏感数据时没有在应用程序的Info.plist

    设置privacy key 新增的privacy setting如下:

    privacy setting

    2, OS_ACTIVITY_MODE

    更新Xcode 8 如果控制台出现enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0enable_oversize: 可通过如下方法设置:

    Edit Scheme-> Run -> Arguments,

    在Environment Variables里边添加

    OS_ACTIVITY_MODE = Disable

    3,iOS10 layoutIfNeed

    iOS10 在一个控件上调用layoutIfNeed是只会单独计算约束,它所约束的控件不会生效,想要达到之前的效果需要在父级控件上调用layoutIfNeed

    4, NSDate

    Swift3.0会将oc的NSDate转为Data类型,有些操作NSDate的第三方库会闪退

    5, Notification

    Swift3.0字符串类型的通知常量被定义为struct

    static let MyGreatNotification = Notification.Name("MyGreatNotification")

    // Use site (no change)

    NotificationCenter.default().post(name: MyController.MyGreatNotification, object: self)'

    6, Zip2Sequence(::) 被移除

    在Swift3.0Zip2Sequence(_:_:)方法被替换为zip(_:_:)

    7, Range<>.reversed 被移除

    在Swift3.0Range<>.reversed方法被移除,被替换为[].indices.reversed().

    var array = ["A","B","C","D"]

    for i in array.indices.reversed() {

    print("\(i)")

    }

    输出:3 2 1 0

    8, Range新增至四种类型

    Range

    CountableRange

    ClosedRange

    CountableClosedRange

    不同的表达式会生成不同的Range

    var countableRange = 0..<20 'CountableRange(0..<20)'

    var countableClosedRange = 0...20 'CountableClosedRange(0...20)'

    9, Swift3.0 Collection 新增 index(_:)系列方法

    Index的successor(), predecessor(), advancedBy(_:), advancedBy(_:limit:), or distanceTo(_:)方法被移除,这些操作被移动到Collection

    myIndex.successor()  =>  myCollection.index(after: myIndex)

    myIndex.predecessor()  =>  myCollection.index(before: myIndex)

    myIndex.advance(by: …) => myCollection.index(myIndex, offsetBy: …)

    10, iOS10 UIStatusBar过期

    如果你需要操作UIStatusBar,在iOS10需要改为

    - (UIStatusBarStyle)preferredStatusBarStyle {

    return UIStatusBarStyleDefault;

    }

    11, iOS10 UICollectionView 性能优化

    在iOS10 UICollectionView 最大的改变是增加了Pre-Fetching(预加载),

    如果你翻看UICollectionView的最新API你可以发现新增了如下属性:

    @property (nonatomic, weak, nullable) id prefetchDataSource

    @property (nonatomic, getter=isPrefetchingEnabled) BOOL

    在iOS10 Pre-Fetching 是默认开启的,如果出于某些原因你不想开启Pre-Fetching,可以通过如下设置禁用:

    collectionView.isPrefetchingEnabled = false

    UICollectionViewDataSourcePrefetching协议定义如下:

    @protocol UICollectionViewDataSourcePrefetching

    @required

    // indexPaths are ordered ascending by geometric distance from the collection view

    - (void)collectionView:(UICollectionView *)collectionView prefetchItemsAtIndexPaths:(NSArray *)indexPaths NS_AVAILABLE_IOS(10_0);

    @optional

    // indexPaths that previously were considered as candidates for pre-fetching, but were not actually used; may be a subset of the previous call to -collectionView:prefetchItemsAtIndexPaths:

    - (void)collectionView:(UICollectionView *)collectionView cancelPrefetchingForItemsAtIndexPaths:(NSArray *)indexPaths  NS_AVAILABLE_IOS(10_0);

    @end

    12, iOS10 UITableView 性能优化

    和UICollectionView一样UITableView也增加了Pre-Fetching技术,UITableView新增了如下属性:

    @property (nonatomic, weak) id prefetchDataSource NS_AVAILABLE_IOS(10_0);

    奇怪的是UITableView并没有找到isPrefetchingEnabled属性的定义

    13,iOS10 UIScrollView 新增 refreshControl 属性

    UIScrollView新增了refreshControl属性

    @property (nonatomic, strong, nullable) UIRefreshControl *refreshControl NS_AVAILABLE_IOS(10_0) __TVOS_PROHIBITED;

    这意味着UICollectionView和UITableView都支持refresh功能了。

    我们也可以脱离UITableViewController使用UIRefreshControl了。

    14, Swif3.0 新增作用域访问级别 fileprivate

    目前有如下访问级别:

    公开(public)

    内部(internal)

    文件外私有(fileprivate)

    私有(private)

    15,Swift3.0 允许关键字作为参数标签

    Swift3.0开始我们将能使用除inout var let关键字作为参数标签

    // Swift 3 calling with argument label:

    calculateRevenue(for sales: numberOfCopies,

    in .dollars)

    // Swift 3 declaring with argument label:

    calculateRevenue(for sales: Int,

    in currency: Currency)

    func touchesMatching(phase: NSTouchPhase, in view: NSView?) -> Set

    如果你坚持要使用inout var let关键字可以使用 `` 包裹参数标签

    func addParameter(name: String, `inout`: Bool)

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