我有一个名为recipDesc的UITextView.我想在我的应用程序中有一个选项来动态调整UITextView的高度,以适应UITextView内的内容(文本)(所以我需要知道如何以编程方式).我找到了Objective-C的一些答案,但我不是很熟悉,所以我不知道如何在 Swift中实现它. 提前感谢任何帮助. 您可以通过以下方式获得UITextView的理想内容大小： let content

我是 Xcode和 Swift语言的新手.我试图了解ViewController中“import”的用法以及我项目中的“框架导入”. 示例：如果我使用CoreLocation,我需要在ViewController中导入CoreLocation,还是需要在项目中导入CoreLocation.framework？ 我这样说是因为一切都运行良好,只使用我的ViewController顶部的导入CoreL

假设我在 Swift中有以下结构： struct Data { let old: Double let new: Double } 现在我有一个包含数据结构数组的类： class MyClass { var myDataArray: [Data] } 现在让我们说我想计算旧值或新值的平均值： func calculateAverage(oldOrNew: String) -> D

当我的应用程序捕获远程通知时,我尝试打开一个特定的ViewController. 让我展示我的项目架构. 这是我的故事板： 当我收到通知时,我想打开一个“SimplePostViewController”,所以这是我的appDelegate： var window: UIWindow? var navigationVC: UINavigationController? func applicat

Swift 2的指南提到可以结束if语句的程序执行.我个人从来没有用if-statement使用break. A break statement ends program execution of a loop, an if statement, or a switch statement…When a break statement is followed by the name of a st

在 Swift中,我们操作的元素都有类型. 当我们使用这些类型时,我们可以添加’！’,’？’或者没有表达他们的可空性. >我怎么称呼’？’要么 ‘！’用来表达这个特质？ 一个类型的装饰者？装饰师？接线员？别的什么？ >在使用此角色时,我应该将所谓的类型称为什么？ 这是一种新型吗？它是装饰类型吗？一种类型的变化？ swift编译器似乎将它们视为新类型,但我的问题不是实现或语言相关,因此我将其标记为语

新手 swift,我试图创建一个服务注册表： class ServiceRegistry { static var instance = ServiceRegistry() private var registry = [String:AnyObject]() private init(){} func register<T>(key:T, value:Any

我目前正在关注 Apple Documentation.这是我的问题： class Person { let name: String init(name: String) { self.name = name println("\(name) is being initialized") } deinit { pri

有没有办法可以在元组数组上调用reduce函数来查找最大值？ 例如 struct Gate{ var maxedOpenGates = 1 var GatesOpen : [(openOrdered : Int, gateNum : Int )] = [] init(defaultSelected : Int = 0){ GatesOpen.appe

我正在使用2个参数在 swift中创建一个类的方法,它们都是可选的.但是,我需要至少填充其中一个才能使方法成功运行,哪个无关紧要 func someMethod(arg1: Sometype?, arg2: Sometype?)-> Void { //I need at least one argument to //be populated to do what

假设我有一段这样的代码： let x: Int? = 10 let y: Any = x 现在我想把y转换成Int？： let z = y as Int? // Error: Cannot downcast from 'Any' to a more optional type 'Int?' 这是不可能还是有另一种方式？ 对于Swift 2.0,您可以使用以下内容： let x: Int? =

我的目标是以恒定速度(在这种情况下为500)使第二个“轨道”第一个体. 基于Constant movement in SpriteKit,我实现了以下内容： override func didMoveToView(view: SKView) { physicsWorld.gravity = CGVector(dx: 0, dy: 0) let firstNode = SKSha

参见英文答案 > Swift Playground – Files are not readable                                    2个 我通读了这些SO链接以获得答案 1. Read a file/URL line-by-line in Swift 2. Read and write data from text file 链接2为我提供了解决方案,但问题

你好, 我想把一个客观的练习从Aaron的书翻译成快速但我无法找到解决方案. Objective’c代码是： @dynamic firstName; @dynamic lastName; @dynamic department; + (NSSet *)keyPathsForValuesAffectingFullName { return [NSSet setWithObjects:@"f

We are given that the string "abc" is valid. From any valid string V, we may split V into two pieces X and Y such that X + Y (X concatenated with Y) is equal to V.  (X or Y may be empty.)  Then, X + "

Given an array A of 0s and 1s, we may change up to K values from 0 to 1. Return the length of the longest (contiguous) subarray that contains only 1s.   Example 1: Input: A = [1,1,1,0,0,0,1,1,1,1,0],

There are N piles of stones arranged in a row.  The i-th pile has stones[i] stones. A move consists of merging exactly K consecutive piles into one pile, and the cost of this move is equal to the tota

Given a binary array, find the maximum number of consecutive 1s in this array. Example 1: Input: [1,1,0,1,1,1] Output: 3 Explanation: The first two digits or the last three digits are consecutive 1s

Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of duplicate files in the file system in terms of their

Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are not. You need to merge them into a new binary tree.

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: I

SQL架构 1 Create table If Not Exists cinema (id int, movie varchar(255), description varchar(255), rating float(2, 1)) 2 Truncate table cinema 3 insert into cinema (id, movie, description, rating) val

SQL架构 1 Create table If Not Exists seat(id int, student varchar(255)) 2 Truncate table seat 3 insert into seat (id, student) values (‘1‘, ‘Abbot‘) 4 insert into seat (id, student) values (‘2‘, ‘Dor

A message containing letters from A-Z is being encoded to numbers using the following mapping way: ‘A‘ -> 1 ‘B‘ -> 2 ... ‘Z‘ -> 26 Beyond that, now the encoded string can also contain the charact

Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are counted as different substrings even they consist o

You are given n pairs of numbers. In every pair, the first number is always smaller than the second number. Now, we define a pair (c, d) can follow another pair (a, b) if and only if b < c. Chain of p

一句话：Swift Package Manager（swift包管理器，简称：SPM）就是在swift开发中用来替代CocoaPod的；在swift开发中，SPM完全可以替代CocoaPod的功能，并且速度更快，体验更佳； 一、安装SPM SPM随Xcode 8.x 一起发布，终端上可查看SPM版本： $ swift package --version Swift Package Manager

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structu

There is a robot starting at position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) after it completes its moves. The move sequence is represe

Given an array with n integers, your task is to check if it could become non-decreasing by modifying at most 1 element. We define an array is non-decreasing if array[i] <= array[i + 1] holds for every