Swift

type(of:)Applied to an object:the polymorphic (internal) Type of the object, regardless of what a reference is typed. Static/class members is accessible by passing a object to type(of:) ..TypeSent to a type in a type declaration:the polymorphic type.

The features of Swift is designed to work together to create a language that's powerful, yet fun to use. Some Additional features of Swift include: Closures Unified with function pointers Tuples and multiple return values Generics

Nested Types Just for the convenience of type integration and use struct BlackjackCard { // nested Suit enumeration enum Suit: Character { case spades = "?", hearts = "?", diamonds = "?", clubs = "?" } // nested Rank

Design patterns are a set of reusable, most known, categorized purposes, code design experience Summary. GOF presents 23 design patterns that will be implemented using swift language OverviewFor the entire application life cycle, only the

Picture size size刚刚开始接触的话，从美工那边拿来的图标大小一般都是偏大的，就像这样：在此建议，tabBar的图标大小可以是32*32,个人感觉效果不错Color problems with pictures如所示，该图标的期望颜色（也就是美工给的原图）如所示：那么问题来了，为什么会变成灰色的呢？经查阅后得知。这是因为在默认情况下，未选中状态图片和字体颜色为灰色，选中状态片和字体颜色为蓝色。法1：通过xib面板设置 ——

Introduction:Nsoperation is an abstract class and does not have the ability to encapsulate operations, it must use its subclasses;blockoperation:Operations are performed asynchronously as long as the blockoperation encapsulated operand > 1, but no

The important thing about dynamic is the ability to get all the methods and properties of a class, and we use the following code to print a list of methods and properties. A function call of the pure Swift class is no longer a OBJECTIVE-C

Use Typealias as an alias for a common data type,On the one hand it is easier to understand the use of this type by alias,On the other hand, you can reduce the amount of code you develop daily.Typealias Usage Examples://Network request common

Import UIKitClass Viewcontroller:uiviewcontroller {Override Func Viewdidload () {Super.viewdidload ()Let image = Uiimage.init (named: "111.png");Let ImageView = Uiimageview ();Imageview.frame = Cgrect.init (x:100, Y:10, width:200,

var dict1 = [1: "A", 2: "B", 3: "C", 4: "D", 5: "E"];var test1 = ["Key1": "Hello", "Key2": "Swift", "Key3": "Learning", "Key4": "Dictionary", "Key5": "Value"]To take a value according to the keyPrint (test1["Key1"]);Number of dictionary

Rounded corners have always been a common problem in development.In order to achieve the effect of partial fillet, I went to check how to achieve with OC. Unfortunately, the direct syntax conversion is not possible after, because mas_maskContraints (

These concepts make people very confused, read a lot of posts, finally figured out, simple summary:AnyAnd AnyObject is the product of two compromises in Swift. What do you mean, there is an ID keyword in OC, which means any object, what is the

Record this point of knowledge:Generally we will encounter in two situations? And! The use1, when declaring a variablevar number:int? var str:string?2, when working with variablesNumber? . hasvaluestr!. HasValueThe following two cases, briefly

1. Know that there is a namespace in Swift-Share globally under the same namespace!-third-party framework using Swift if you drag directly into the project, dependent on the same namespace, there is a good chance of conflict!-Try to use cocoapod

Pay attention to judging the condition,Override Func Prepare (for Segue: Uistoryboardsegue, sender: any ?) {if let cell = sender as ? Uicollectionviewcell, Let Indexpath = CollectionView?. Indexpath (For:cell), Let Managepageviewcontroller =

1,as Use occasions(1) converting from derived class to base class, upward transformation (upcasts)1 class Animal {} 2 class Cat:animal {} 3 Let cat = cat ()4 as Animal(2) Elimination of ambiguity, numeric type conversion1 the as CGFloat 2 the as

To make use of. Let to declare constants, so that var to declare the variable. ? A constant value is not required at compile time, but you can only assign a value to it. So you can? Use constants to table? A value: You just have to decide, but

Note: After the push is set self.hidesbottombarwhenpushed=no;//so back, Tabbar will return to normal display.Let Detailctrl = Scanviewcontroller (nibname: "Scanviewcontroller", Bundle:nil); Detailctrl.hidesbottombarwhenpushed = True

Import FoundationImport UIKitImport CoregraphicsExtension uiview{var left:cgfloat{set{var frame = Self.frameframe.origin.x = newvalueSelf.frame = Frame}get{Return self.frame.origin.x}}var top:cgfloat{set{var frame = Self.frameFRAME.ORIGIN.Y =

Tuples (tuples) combine multiple values into a single composite value. A value within a tuple can make a discretionary type. is not required to be the same type. you can combine random-order types into a single tuple that can include all types. Just